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砂田 知範, 松村 隆, 木之本 剛, 越智 保雄, 政木 清孝
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発行日: 2006/09/15
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Recently, because the micro-machine is noticed and electronic equipments are made much lighter and smaller, the demand for micro materials is increasing. However the mechanical properties data of the micro materials obviously run short and the evaluation method of micro materials is different according to the researcher. Therefore, the establishment of the test method for the micro materials is very necessary. In this study, the tensile strength tests were carried out using the bonding wires of Cu as the material. Its diameters were 20μm and 50μm. The gauge lengths of the specimens were three kinds of 20mm, 60mm, and 100mm. As the results, in the case of all materials, Young's moduli were almost equal regardless of the gauge lengths. Therefore, it was found that Young's modulus could be measured with high accuracy. But, Young's modulus for Cu wire of 20μm is greatly different from that of 50μm. It is considered that the orientation is a cause. The tensile strengths also were almost equal regardless of the gage length. The elastic limit and proof stress for gauge length of 20mm were the largest regardless of the materials.
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平方 寛之, 松本 祥平, 武村 正輝, 北村 隆行
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An experimental method is developed to evaluate the deformation property of thin films with helical nanostructures (nanosprings). In this method, several nanosprings are combined by a cap layer and not only vertical but also lateral load is applied to the layer. In particular, this is the first report of the lateral stiffness measurement of nanosprings. The thin film with helical nanosprings shows anisotropic deformation and the stiffness is two to three orders lower than that of dense films.
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天木 伸吾, 神谷 庄司, 梁瀬 博昭, 羽生 博之
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Microscopic bending tests were performed to measure mechanical strength of hard coatings produced by physical vapor deposition. The results were analyzed on the basis of Weibull statistics and compared with those obtained with chemically vapor deposited diamond coatings. It was clearly found that the scatter of strength of a physically vapor deposited TiN coating was much larger than that of a chemically vapor deposited diamond coating. It was speculated that significantly large defects could be introduced in the PVD process.
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玉川 欣治, 三浦 英生
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Young's modulus of electroplated copper thin films was measured by using a tensile test and a nano-indentation method. The anisotropic Young's modulus was measured in the films, i.e., 20-45GPa in a horizontal plane and 60-90GPa along the thickness direction. The films consisted of mixture of large columnar grains with about 5μm diameter and small grains with about 0.5μm diameter.
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松田 伸也, 高橋 学, 岡部 永年
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Pore-free ceramics (PFC) material was investigated mechanical properties and fracture behavior such as 4-point bending and static fatigue at room temperature. Arranging by relationship between bending strength and fracture probability, Weibull modulus of PFC decreases compared with regular same ceramics. It is attributable to different fracture mechanics. PFC has binder exists instead of a potential defect and they are distributed minutely and uniformly. When a specimen is loaded, a lot of cracks occur in boundary between binder and ceramic grain and strain energy is released. Some clusters are formed by some cracks' uniting. The scatter of fracture strength that depends on the size of the cluster is caused. As for static fatigue test of PFC, the time dependence fracture wasn't caused. In addition, all experimental values are more than average of bending strength. Fracture model above can explain this behavior to which crack coalescences stop.
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神谷 庄司, 本田 直子, 天木 伸吾, ポール オリバー, ルーター パトリック, 坂 真澄, 市村 正也
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Static strength tests and dynamic fatigue tests were conducted on a polycrystalline silicon material, which is one of the most common materials to compose micro electromechanical systems. Scatter of static strength was explained in terms of the distributed length of equivalent cracks, which in tern was analyzed with the fatigue crack propagation law to estimate the distribution of fatigue lifetime. By fitting the experimental data to the theory, the cumulative probability of fracture was plotted in a three dimensional manner as a function of both the amount of applied stress and the number of fatigue cycles. This plot quantitatively characterizes the reliability of the polycrystalline silicon material examined in this study.
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神谷 庄司, 昔農 仁史, 羽生 博之, マダレノ ジョアナ カタリナ, カブラール ジル, グラシオ ジョゼ
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This paper describes the fatigue characteristics of CVD diamond films on a silicon substrate. Repeated indentation load was applied to the diamond film surface with a spherical indenter to introduce mechanical fatigue damage in the films and interfaces with a minimum amount of tribological surface damage. Appearance of fatigue damage was quite sensitive to the methane concentration in the source gas mixture for deposition, which was closely correlated with the toughness of films and interfaces obtained in previous studies. Fatigue damage in this study seems more susceptible to the strength of interface than the strength of film, while the film strength has a stronger influence on the state of damage under monotonically increasing indentation loads.
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尾谷 宗之, 玉川 欣司, 三浦 英生
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Electroplated Cu thin films have begun to be used for interconnections of semiconductor devices. Since the micro structure of thin films varies strongly depending on the film deposition condition, their mechanical properties may change from those of bulk material of Cu. Therefore, mechanical properties of electroplated Cu thin films were measured by nanoindentation technique. The distribution of Young's modulus of the films varied drastically depending on not only chemical film-deposition condition but also structural condition.
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笹川 和彦, 山路 尚, 福士 翔大
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It is known that there is a threshold current density of electromigration damage in the via-connected line. The evaluation of the threshold current density is one of the great interests from the viewpoint of IC reliability. In this study, metal lines with two-dimensional shape, i.e. angled metal lines are treated. The evaluation method of the threshold current density is applied to the metal line. The method is based on the numerical simulation of the building-up process of the atomic density distribution in bamboo lines by using the governing parameter for electromigration damage. Comparing the evaluated results with that of straight-shaped line, the effect of line-shape on the threshold current density of electromigration damage is discussed. Furthermore, the obtained difference in the threshold current density is verified experimentally.
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越前谷 大介, 坂本 博夫, 谷 周一
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Recently, the polycrystalline silicon market is growing over the world, and it is also desired to establish the reliability assessment. The presented paper describes a strength evaluation of polycrystalline silicon by measure of bending strength and analyze the residual stress distribution by Raman spectrometry of abraded sample and polished sample. It is found that the surface damage affect the strength of the polycrystalline silicon. And an attempt is made to measure the intrinsic crack size based on the fracture mechanics by the residual stress distribution.
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于 強, 澁谷 忠弘, 藤澤 良知, 白鳥 正樹, 鶴見 和則, 小柏 俊典, 宮入 正幸
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In this study, mechanical response of low temperature sintered body was examined. Tensile strength and elongation of the sintered body were evaluated experimentally. Because microstructure of sintered body affects several mechanical properties, cluster structure was simulated using DLA (diffusion-limited aggregation) model and tensile properties of cluster structure were extracted from finite element analysis. Comparing with experimental results, the validity of cluster model simulation was examined. Low temperature sintered body has lower tensile strength and elastic modulus because of network of clusters. Cluster structure depends on the porosity and the sintering temperature. Simulated elastic stiffness depends cluster structure and its value is lower than bulk. The fracture behavior of particles in clusters connects macroscopic tensile strength and elongation of sintered body. It agrees with the SEM observation of the fracture surface. Cluster of particles characterizes the macros copic mechanical properties of sintered body.
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Do Van TRUONG, 平方 寛之, 北村 隆行
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An electronic device consists of multi-layered submicron-thick films, and delamination often takes place at an interface edge because of the stress singularity near the edge. Since the stress singularity at an interface edge depends on the edge shape, the fracture mechanics concept cannot be used to compare the delamination strength between the components with different shapes. This paper aims at prediction of the delamination strength at the interface edge with arbitrary shape using a cohesive zone model. Two different experiments are conducted for a gold thin film on a silicon substrate to calibrate the cohesive law. The validity of the approach is discussed.
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熊谷 知久, 原 祥太郎, 泉 聡志, 酒井 信介, 竹内 久雄
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In this study, a bond order type interatomic potential for Al-N systems is developed in the framework of a generalized method for potential development proposed by our group. Extended Tersoff potential function is employed for the potential function. In case of potential parameters for pure Al, lattice constants and cohesive energies of polytypes and elastic constants of FCC phase are fitted to. In case of those for pure N, lattice constants and cohesive energies of polytypes, vibration number of dimer and bulk modulus of diamond are fitted to. In case of those for the Al-N interaction, lattice constants and cohesive energies of binary crystals that involve various coordination numbers and wide range of bond angles. Potential parameters are optimized by using genetic algorithms. The developed potential well reproduces Al-N systems.
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鈴木 研, 伊藤 大幸, 三浦 英生
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In order to explicate the fracture and degradation mechanisms of stress corrosion cracking (SCC) of stainless steel, we analyzed the chemical reaction dynamics of the alloy system by using the quantum chemical molecular dynamics simulation. Tight-binding quantum chemical molecular dynamics simulations enabled us to present a clear view of the oxidation process of metal surface including the anodic dissolution and formation of oxide or protective films at an atomic level. We found that the oxygen atoms preferably stay around the chromium atoms, implying that oxidizing species have the tendency to coordinate the chromium atoms and spontaneous formation of a chromium oxide film would take place on Fe-Cr clean surface at the beginning of its oxidation process.
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木下 佑介, 梅野 宜崇, 北村 隆行
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Carbon nanotubes (CNTs) have been attracting attention because of their prominent mechanical and electronic properties. In this study, we investigate the deformation of a single-walled carbon nanotube (SWCNT) with a bend junction using atomistic modeling with Brenner potential to analyze strain concentration caused by macroscopic tube shape and microscopic interatomic bond structure. The simulation model consists of (8, 8) and (14, 0) CNTs connected with a flexion angle of 30 degrees. For geometric reasons five and seven-membered rings are introduced at the inside and outside of the bend junction. After the structure under no external load is determined, tensile load is applied to the model. Then, we analyze the strain concentration at the bend junction, and high tensile strain is observed at the inside of the bend junction. The strain at the seven-membered ring at the inside of the bend junction has higher strain compared to the neighboring rings due to the microscopic effect.
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西川 出, 阿部 真哉, 灰庭 照繕
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Nonlinear digital image correlation method was developed in this study for evaluating the stress intensity factor of the cracked member. The nonlinear interpolation method was also developed and introduced into this method. It was found that this method was successfully applied to the crack problem through the fatigue crack opening test. Good results for evaluating the stress intensity factor were obtained at the front of the crack tip, on the other hand too large value of the stress intensity factor was evaluated at the position far from the crack plane. Suitable positions were found to exist for the evaluation of the stress intensity factor using this nonlinear digital image correlation method.
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佐藤 雄大, 江角 務
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It is said that destruction strength of the material is important from the viewpoint of recent years of the lightening design. The polymeric material makes the best use of an excellent characteristic in that, and the usage has been expanded more and more as a structure material of the machine and the structure. The one that is called so-called engineering plastic is this kind of one. Because the polycarbonate especially is a high lightness rigidity and has the characteristic with a good physical properties, the system requirements is also various. It aimed to use the simple type high-speed photography machine together with the high-speed photography machine in this research, to compare the results of each temperature, and to examine the effectiveness of the simple type movie camera.
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小川 尚幸, 江角 務
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The contact side is in the complex stress state by the example of receiving the external force coming in contact the object each other and being used in engineering. It is assumed that these cause the surface damage by straightening, and generating extremely high contact pressure power in the vicinity of contact side. A static load is loaded to the disc where a part of crack exists, and then, the stress field in the point of contact neighborhood is analyzed, and examined experimentally in this research. Concretely, how parameters of the contact side obtained by the formula of the stress intensity factor obtained from an experimental analysis by a photodynamic technique and the hertz and the contact pressure, etc. exert the influence is considered to the crack parameter of the disk. A static load loaded by the lever equation loading device.
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橋本 幸記, 江角 務
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Lightweight polymeric materials are widely used in transportation machines as alternatives to metallic materials, since weight reduction of those machines is required to achieve low transportation cost by increased fuel efficiency, and demands for this material will obviously rise. However, the fracture toughness testing method in the polymeric material has not standardized in Japan. In this study, optical experiments by the method of transmitted caustics were carried out in order to construct the fracture toughness method in the polymeric material. The result shows a craze caused in the crack point has an influence on the fracture toughness value calculation by the method of transmitted caustics.
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丸野 祐策, 青池 聡, 金田 潤也, 小畠 亨司, 越石 正人
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In this study, K value and the occurrence of permanent deformation in TDCB specimen, which has shorter specimen length than traditional TDCB specimen, were evaluated by elastic-plastic analysis. In the case of TDCB specimen that has 35mm length, it is demonstrated that K values become almost constant with m value of 0.560 and there is no permanent deformation under the load condition of K=25MPa√<m>.
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畑 周作, 廣江 哲幸, 寺由 斉史, 藤原 和人, 波多 英寛
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The development of reliable constitutive equations for solid polymers has become of interest recently due to the growing use of polymeric materials in structure, and especially, biodegrability polymers such as polylactic acid, PLA are noticeable from the environmental-friendly view point. In this study, monotonic compressive deformation tests were conducted under time-varying strain rate and temperature conditions of 1.1×10^<-2>〜10^<-5>s^<-1> and 10〜60℃ for nanocomposite-processed PLA (nPLA). Experimental stress-strain responses were compared with those of typical engineering polymers: PE, PP and PD, and some important deformation characteristics are revealed regarding stiffness, work-hardening and softening, overshoot phenomena in stress jumping conditions, stress-strain responses at elevated temperature, and inapplicability of time-temperature equivalence. The viscoplastic constitutive model based on overstress, VBO has reproduced basic experimental results successfully.
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石川 明克
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The inelastic constitutive equation is effective to the detail design of the components which are often imposed to inelastic deformation. Hart have been introduce the plastic state equation for the inelastic constitutive equation. This constitutive equation was matching well in the macroplastic deformation. But in the microplastic region, these equations are not representation. In this report, I introduce a technical modifications of Hart's constitutive equation for the microplastic region. This modification includes a application of the two yielding surface theory. The results are good representation for the experimental data in the nonlinear region of the stress-strain diagram.
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屋口 正次, 緒方 隆志, 大野 信忠
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Macroscopic deformation behavior of a directionally solidified (DS) superalloy was experimentally investigated and an anisotropic constitutive model for the material was developed. Monotonic and creep tests were performed on uniaxial test specimens machined from DS plates so that the angles between loading direction and the solidified grain direction varied between 0 to 90 degrees. Tension-torsion creep tests were also conducted to examine the anisotropic behavior under multiaxial stress conditions. The material exhibited remarkable anisotropy under elastic and viscous deformation conditions, while it showed isotropy under plastic deformation conditions of high strain rates. Then crystal plasticity analyses were carried out to identify slip systems under creep loading conditions and presume the anisotropic creep behavior of the DS material analytically. A unified constitutive model was proposed to express both the anisotropic elasticity-viscosity and the isotropic plasticity. The elastic constants were determined applying a self-consistent approach to the material, and viscous parameters were modeled on the basis of the crystal plasticity analyses. Calculation results obtained using the constitutive model were compared to the experimental data to evaluate validity of the model.
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天谷 徹, 伊藤 隆基, 坂根 政男
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Most of the design codes use certain equivalent values to predict multiaxial fatigue life, like von Mises and Tresca equivalent stresses and strains, because of their simplicity and easiness to use. However, von Mises equivalent stress and strain have no negative values so that they have a difficulty to express stress and strain ranges. The Tresca equivalent values, on the other hand, have negative values but they also have a difficulty to put a sign to the shear stress and strain under multiaxial loading. A clear procedure for calculating the stress and strain is needed for the multiaxial fatigue design for structural components. This paper proposes a method for determining the principal stress and strain ranges under proportional and nonproportional loading in triaxial stress and strain states introducing an angle rotation of the maximum principal stress and strain.
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大下 賢一, 北澤 吉満, 長岐 滋
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The machine components used at elevated temperatures are commonly subjected to cyclic stresses in addition to static stress. This problem is in the medium state between fatigue and static creep, being one of the essential mechanical properties needed for design of high temperature machine components. In the present study, fatigue-creep interaction tests were performed for A2024 under stress rate-controlled triangular tensile-torsional stress wave at elevated temperature. Then the creep constitutive equation under multi-axial cyclic stresses is proposed on the basis of the formula of extended Norton-Bailey, and creep deformation behavior was numerically analyzed in comparison with the test results. It was found that these calculations slightly underestimated measured creep curves.
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時政 勝行
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The present paper investigates the applicability of the multistage spring, slider and dashpot rheological model to description of creep-fatigue deformation behavior of materials, where it is assumed that the frictional stress of each slider element is dependent on the applied strain rate and is related with other model parameters. The equations to describe the stress versus strain relationships of materials subjected to creep-fatigue loadings, such as so-called PC or CP straining, were derived based on this model. The creep-fatigue deformation behaviors of 316LC steel at 1023K were estimated by using these equations, where the model parameters determined for 316LC steel by GA analysis in the previous report were used.
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佐野 篤史, 阪口 基己, Tra Tran Hung, 岡崎 正和, 関原 傑
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金谷 章宏, 楠元 淳一, 早川 弘之, 永住 浩司
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Cyclic softening behavior of Cr-Mo-V Cast Steel for hot components of steam turbine was evaluated by low cycle fatigue tests. The dependency of the relationship between number of cycles and maximum stress on test conditions was examined. The hardness of interrupted test specimens was related to maximum stress. From these studies, maximum stress during low fatigue test could be estimated by number of cycles and hardness respectively, in terms of strain range. This could make it possible to estimate strain range of low cycle fatigue by number of cycles and hardness of components.
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山本 隆栄, 古庄 健太郎, 坂根 政男, 中村 祐太, 伊藤 隆基, 平井 孝典, 濱田 直巳
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This paper describes the low cycle fatigue life of 1070 aluminum under stress controlled multiaxial loading. Proportional loading tests were carried out under combined push-pull and reversed torsion. Non-proportional loading tests were also carried out using three stress paths of cruciform, box, and circle. Mises stress range, Mises strain range and maximum principal stress range were applied to the experimental data and the applicability of the life prediction methods was discussed. No life prediction methods accurately predicted the multiaxial low cycle fatigue life under non-proportional loading within a small scatter band.
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村嶋 克俊, 伊藤 隆基
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セッションID: 4010
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This study evaluates the material dependence on multiaxial low cycle fatigue in order to develop a suitable strain parameter for life prediction under non-proportional loading. Strain controlled multiaxial low cycle fatigue tests under 2 types of proportional and non-proportional loadings were carried out using SUS316NG and SGV410 hollow cylinder specimens at room temperature. The reduction in low cycle fatigue life due to non-proportional loading is discussed by connecting with an additional hardening and crack initiation and propagation behaviors. Fatigue lives decrease down to 1/5 due to non-proportional loading for SUS316NG and SGV410 steels, but degrees of additional hardening are different.
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濱田 直巳, 坂根 政男, 元家 勝彦, 梅田 洋
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In order to study the stress waveform effect on low cycle fatigue life, low cycle fatigue tests were carried out using circumferential notched specimens of SUS316FR stainless steel under fast-fast, slow-fast and hold-time stress waveforms at 923K. Elastic-plastic-creep finite element analyses were also carried out to evaluate the local stress and strain at notch root. Fatigue failure lives were underestimated by the prediction based on the local strain calculated in ASME Code Case NH and finite element methods. Crack initiation lives under fast-fast stress waveform were estimated properly by the local strains but those of the other waveforms were overestimated.
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山崎 陽介, 岡村 一男, 牧野 泰三, 瀬羅 知暁
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The objective of the present paper is to propose a highly accurate FEM analysis method while taking the phase transformation and the tempering effect into consideration. We developed an algorithm in which the tempering effect is represented by the estimated carbon concentration. As a result, the proposed method by using the above algorithm correctly estimated the volume shrinkage phenomenon due to tempering in FEM analysis. Moreover we evaluated the residual stress in TIG welded block specimen experimentally and analytically. And we confirmed that the proposed method has a higher accuracy than the conventional method.
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天野 尋庸, 大野 信忠, 川島 扶美子, 猪狩 敏秀
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発行日: 2006/09/15
公開日: 2017/08/01
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In this study, 3D elastic-plastic finite element analysis of a plate-fin structure with a fin offset was done by taking a unit cell consisting of two layers. The material of plate-fin was SUS316, and the multi-linear kinematic hardening model of Ohno and Wang was employed as the constitutive model of plasticity of this material. The unit cell was subjected to either monotonic or cyclic loading at 600℃, along with a differential pressure between the two layers. The periodic boundary condition was imposed on the opposed surfaces of the unit cell. It was thus found that the plate-fin structure exhibits significant anisotropy in the overall deformation as well as considerable compressibility in the layer-stacking direction. It was also found that the local strain range in the fin is several times larger than the overall strain range of the unit cell.
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猪狩 敏秀, 高尾 伸行, 大谷 知未, 柴本 宏, 笠原 直人
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発行日: 2006/09/15
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Prediction method of inelastic stress-strain behavior was discussed for spherical tube sheet in steam generator of fast breeder reactor. Influence of curvature on macro and local stress strain behavior was focused on the basis of FEM analysis using unit cell structure. Thermal stress analysis of spherical tube sheet using equivalent solid plate modeling was carried out, and the results were compared with those using the detailed modeling considering all holes.
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川崎 信史, 細貝 広視, 古橋 一郎, 笠原 直人
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発行日: 2006/09/15
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Thermal transient stress at core support structure of advanced fast reactor was evaluated using thermal hydraulic-structure total analysis method with experimental design. Maximum thermal stress is calculated 15〜18% larger than nominal thermal stress by uncertainty of system parameters. Maximum thermal stress was evaluated 63〜68% larger than nominal thermal stress when predicted by the past deign method, therefore about 40% excessive imaginary stress could be appropriate by thermal hydraulic-structure total analysis.
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佐野村 幸夫, 斎藤 和敬
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セッションID: 4016
発行日: 2006/09/15
公開日: 2017/08/01
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Jinyi LEE, Jiseong HWANG, Kazuhiro OGAWA, Seho CHOI, Jongwoo JUN, Tets ...
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セッションID: 4017
発行日: 2006/09/15
公開日: 2017/08/01
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Magnetic nondestructive testing is very useful for detecting a crack on the surface or near the surface of ferromagnetic materials. Also, the distribution of the magnetic flux leakage (DMFL) on the surface has to be obtained quantitatively to evaluate the crack. And the DMFL measurement on the high lift-off can be used for the protection of magnetic sensors from damages due to weak environment such as high temperature, vibration, vapor, and dust. Because the magnetic field is inversely proportional to the square of the lift-off, improved techniques for increasing the detection probability are strongly demanded. The magnetic camera using magnetic lens is proposed to satisfy these demands such as obtaining DMFL, measuring on the high lift-off, and improving sensitivity of sensor. This paper proposes several techniques for improving the detection probability of the magnetic camera. The surface mounted device type operational amplifiers, AD620 and LM324, were compared with respect to sensitivity, S/N ratio, delay time, and Fast Fourier Transform analysis. Also the reference single ended and the non-reference single ended connections were compared.
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山際 謙太, 高梨 正祐
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セッションID: 4018
発行日: 2006/09/15
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Fractography is the essential method for failure analysis. Diameter, depth and direction of dimples observed on ductile fracture surface is related deeply to the ductility and the crack propagation direction. In this paper, we propose one of numerical methods for fractography to characterize dimple's diameter. Long Run Emphasis (LRE) which is the statistic value of texture analysis and relates directly to the diameter of dimple, is calculated. The method is applied to the fracture surfaces of Titanium alloy which were formed by the high-temperature tensile test. In the result, the relationship between the temperature and LRE was obtained. Therefore, we could estimate the temperature from the dimple by the method.
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金谷 政孝, 竹田 陽一, 大地 昭生
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セッションID: 4019
発行日: 2006/09/15
公開日: 2017/08/01
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The high efficiency pulverized coal fired power generation so called an Advanced Ultra SuperCritical plant, in which the main steam condition of 30MPa of pressure and 700℃ in temperature are considered, has been aiming to establish in order to increase its efficiency of the power generation. In such condition, it is desirable to utilize the Ni-base alloys as structural material due to the severe environmental condition. The effect of steam on degradation behavior of Inconel 718 under bending stress in high temperature environments was investigated. Stress accelerated grain boundary oxidation is considered to be a prior mechanism in the environmental effect. The four-point bending tests at 750℃ in air and steam environments were performed. It was found that local delamination of oxide layer in the specimens exposed in a steam environment. Surface cracks were found after four-point bending test in steam and were thought to be formed subsequent to the local separation of surface oxide layer. Cross-sectional analysis using SEM-EDX showed that Nb oxide and Ti oxide were apparent adjacent to the crack. These results exhibit that the cracks were attributed to break of these oxides under bending stress.
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本田 哲也, 駒崎 慎一, 杉本 隆之, 幸野 豊
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セッションID: 4020
発行日: 2006/09/15
公開日: 2017/08/01
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The thermal desorption spectroscopic analysis after the hydrogen charging was applied to the interrupted creep specimens to investigate the effect of creep on the changes in hydrogen desorption characteristic of high Cr turbine rotor steel. In addition, the measured spectra were decomposed to two different spectra and their changes with aging and creep were investigated to correlate the variations in spectrum with the microstructural changes. Experimental results revealed that the applied stress had no large influence on the change in hydrogen spectrum and the amount of hydrogen desorbed at temperatures ranging from R.T. to 250℃ decreased significantly with increasing creep life fraction at the early stage of life. The changes in decomposed spectra in the low and high temperature regions were also discussed from the standpoints of the variations in lath-martensite structure and precipitation behavior of carbides and Laves phase, respectively.
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三浦 直樹, 山本 真人, 楠元 淳一, 金谷 章宏
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セッションID: 4021
発行日: 2006/09/15
公開日: 2017/08/01
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To achieve rational maintenance for fossil power plants, prediction of remaining life for structure components is quite important. Precise evaluation of critical flaw sizes, which provides failure criteria of the components with postulated crack-like-flaws under a specific operating condition, is one of the key issues. In this paper, fracture criteria of a structure material with a wide range of temperature including transition temperature range were examined. Based on the fracture test results, it is ascertained that fracture load can be well predicted by R6 procedure for assumed temperature range of interest.
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楠元 淳一, 金谷 章宏, 山本 真人, 三浦 直樹
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セッションID: 4022
発行日: 2006/09/15
公開日: 2017/08/01
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To achieve rational maintenance for fossil power plants, prediction of remaining life for structure components is quite important. Precise evaluation of critical flaw sizes, which provides failure criteria of the components with postulated crack-like-flaws under a specific operating condition, is one of the key issues. In this paper, the effects of structural or material properties on the critical crack sizes were investigated by means of R6 based analyses. Subsequentry, the crack evaluation method for CrMoV cast alloy were proposed according to the analysis results, and a crack evaluation case study was demonstrated using the proposed method.
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寺前 哲夫
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セッションID: 4023
発行日: 2006/09/15
公開日: 2017/08/01
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杉浦 隆次, 横堀 壽光, 田淵 正明, 鎌田 哲生
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セッションID: 4024
発行日: 2006/09/15
公開日: 2017/08/01
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Creep crack growth behavior is very sensitive to the variation of materials micro structures such as the heat affected zone of weld joint. This is a main issue to be clarified for 9%Cr ferritic heat resistant steel concerning the application of actual component structure. In this paper, high temperature creep crack growth tests were conducted on CT specimens with crack in the heat affected zone of weld joint of W added 9%Cr ferritic heat resistant steel (ASME Code: P92). The creep crack growth behavior in the heat affected zone of weld joint was investigated. On the basis of Q^* concept, the algorithm of predicting the life of creep crack growth was proposed. Furthermore, 3-dimensional elastic-plastic creep FE analyses were conducted and the effect of stress multi-axiality of welded joint on creep crack growth rate was discussed as compared with that of base metal.
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西田 秀高
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セッションID: 4025
発行日: 2006/09/15
公開日: 2017/08/01
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The surface of welded joint specimens for service material are applied by Boron element, they are taken Heat Treatment at 630℃×1000Hours. We have creep rupture tests them at 630℃×39.2MPa, as a result, Residual Life extends 1.5times, and one of Simulated Coarse, Fine Heat Affected Zone Specimens are 2.5〜4times at 630℃×78.4MPa on creep rupture tests, and They are confirmed that Boron is segregated on the Grain Boundary and trespass to center section of specimen by diffusion, Distance from surface by diffusion is about 1mm, and Verification of the effect on life extension by FEM is about 1.5times, therefore, We consider that life extension of aging boiler by applying Boron is possible.
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河村 能人
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セッションID: 4040
発行日: 2006/09/15
公開日: 2017/08/01
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Recently, new magnesium alloys with high mechanical strength and heat-resistance have been developed in Mg-RE-Zn (RE: Y, Dy, Ho, Er, Gd, Tb, Tm) system, and are widely noticed in industrial circles. These Mg-RE-Zn alloys are characterized by a long period ordered (LPO) structure. The mechanical properties of these LPO Mg-RE-Zn alloys are drastically improved by plastic deformation. Extruded LPO Mg-RE-Zn alloys exhibit high yield strengths greater than 350MPa and elongations of 4% or higher at ambient temperature, and high elevated-temperature yield strength greater than 300MPa at 473K. The LPO Mg-RE-Zn alloys are promising candidates for lightweight structural materials.
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阮 立群, 河村 能人, 山口 恵資, 丸茂 康男, 向田 達宏
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発行日: 2006/09/15
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This research mainly discussed the processing temperature and the processing velocity influence on the deformation resistance and ductility of Mg_<96>Zn_2Y_2, a kind of high-strength magnesium alloys. Therefore, compression deformation experiments of column were performed. We also examined the variation of deformation resistance and ductility of this kind of magnesium alloy. Moreover, the dependence on deformation temperature and deformation speed of this magnesium alloy was evaluated as well.
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阮 立群, 河村 能人, 山下 利彦, 堂上 卓志, 今村 康博
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発行日: 2006/09/15
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This research mainly investigated the processing temperature and the processing speed influence upon the deformation resistance and ductility of three kinds of casting magnesium alloy materials, one of which was named Mg_<96>Zn_2Y_2, a kind of high-strength magnesium alloys. For this purpose, compression deformation experiments of column were performed. We also examined and compared the variation of deformation resistance and ductility of three kinds of materials. Furthermore, the dependence on deformation temperature and deformation speed of these materials was evaluated.
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野口 博司, 北原 陽一郎, 坂本 満, 上野 英俊
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セッションID: 4043
発行日: 2006/09/15
公開日: 2017/08/01
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Rotating bending fatigue tests were carried out to investigate fatigue strength and notch sensitivity of notched specimens of non-combustible magnesium alloy, AMX602B(X=Ca). The fatigue strength and notch sensitivity of AMX602B(X=Ca) were compared with that of age-hardened aluminum alloy, 6061-T6 and commercial purity titanium, TP28. These materials were about the same tensile strength. It was clarified that the critical stress for crack initiation of AMX602B(X=Ca) was the same as that of 6061-T6 and lower than that of TP28. The threshold stress for crack propagation of AMX602B(X=Ca) was lower than that of 6061-T6. The notch root radius ρ_0 at the branch point of AMX602B(X=Ca) was 0.02〜0.05mm and was much lower than that of 6061-T6(ρ_0=0.4). The notch sensitivity of AMX602B(X=Ca) was high and the same as that of 6061-T6.
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森重 利紀, 野口 博司, 坂本 満, 上野 英俊
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セッションID: 4044
発行日: 2006/09/15
公開日: 2017/08/01
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Rotating bending fatigue tests and tension-compression fatigue tests were carried out to investigate effect of mean stress on fatigue strength at N=10^7 on specimens with a small artificial hole of non-combustible magnesium alloy, AMX602B(X=Ca). It was clarified that the fatigue strength at N=10^7 under tensile mean stress could be estimated using the modified Goodman diagram. However, the fatigue strength at N=10^7 under compression mean stress could not be estimated using the modified Goodman diagram. Non-propagation crack was not observed among the non-broken specimens at N=10^7 by rotating fatigue tests. The Fatigue strength at N=10^7 of the specimen with the small artificial hole is not threshold stress for crack propagation but critical stress for crack initiation. Hence it is probable that the effect of mean stress on fatigue strength at N=10^7 is small and the fatigue strength at N=10^7 under compression stress cannot be estimated using modified Goodman diagram.
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