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赤穂 良輔, 伊井 仁志, 肖 鋒
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発行日: 2006/09/15
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Most of the existing numerical models for the simulation of Tsunami are based on the 2D shallow water equations. However, for many situations, it is necessary to use the 3D model in addition to the shallow water models to evaluate the damage in the coast region with a reliable accuracy. So, we propose the multi-scale warning system for Tsunami by connecting these models to cover the physical phenomena that have diverse scales in both time and space. In this paper, we present the formulation of the 2D shallow water wave model based on the CIP/MM-FVM with the MOC. In addition, we construct the formulation for the source term preserved the fundamental balance between the source term and the flux gradient. Finally, we apply the present model to some "real-case" numerical experiments.
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陳 春剛, 肖 鋒
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A conservative and accurate scheme of advection transport is devised for the spherical geometry. The sphere is represented by the gnomonic cubic grid. The piecewise interpolation reconstruction of the transported field is built in terms of both the volume integrated average (VIA) and the point value (PV) of the field variable over each mesh element of quadrangle. In the present formulation, the VIA and the PV, which are generically called "moments", are defined over each control volume (i.e. the mesh element) and its boundary. The point values are predicted through a semi-Lagrangian solution, while the volume integrated values are updated by a finite volume formulation of flux form. A 2D quadratic polynomial is constructed over each mesh element, and a third-order scheme is obtained.
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姫野 武洋, 渡辺 紀徳
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With the progress of human activities in space, the occasion to handle liquids under low-gravity conditions is now growing. The absence or diminution of gravity force makes it difficult to position and control the liquid in a desirable manner. For the establishment of the technology for the management of liquid propellant in space vehicles, a numerical method, called 'CIP-LSM' (CIP Level Set method & MARS), was developed to simulate three-dimensional free-surface flows under various gravity conditions, which has been applied to clarify the dynamic behavior of liquid propellant in the tanks of launch vehicles.
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胡 長洪, 柏木 正
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In this paper a new interface capturing scheme, THINC (tangent of hyperbola for interface capturing) scheme, is incorporated into our CFD code for the numerical simulation of violent sloshing in a 3D rectangular tank. The THINC scheme is superior as an interface capturing scheme in that the numerical diffusion is less and the mass conservation is good even for long-term computations of violent sloshing. These excellent features of the THINC scheme are demonstrated with some preliminary numerical examples.
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坂井 雅之, 田中 伸厚, 小室 迪泰
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Prediction and evaluation of boiling phenomena are important for engineering field. In order to analyze boiling phenomena numerically, we have developed a computational method which is based on FVM discretization and CIVA interpolation method for treating complicated engineering problems. As for phase change model, we adopt the modified temperature recovering method. A comparison of the numerical results of hydrogen boiling problem shows good agreement with the past study by Juric et al.. Furthermore, for improving treatment of small bubbles whose size is less than the mesh resolution, we introduced a kind of two-phase model, two-velocity field model, for gas and liquid phase.
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滝沢 研二, 今井 陽介, 青木 尊之
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Recently, a high-order accurate conservative scheme called IDO^(1)-CF was proposed for solving incompressible fluid flow equations in conservative form. In this study, free surface flow is solved by the IDO-CF and newly proposed boundary estimate method. The interfaces are solved like cut cell method, but all cell flux is calculated by each directional differential operators. The differential operators at the boundaries are solved by Taylor series and the over wrapped cell. Dirichlet and Neumann boundaries could be solved by 3rd-order accuracy. The method also used cell mixing technique to avoid numerical instability for small cell. In this time, CIP-CSL2^(2) interpolation is used for the mixing cell. A broken dam problem was computed as a test by the Ghost Fluid^(5) framework.
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山下 晋, 肖 鋒
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Surface waves can be generated when air blows over a water body. A turbulent boundary will then develop on the air/water interface. The flow structure over the moving interface substantially affects the turbulent transfers of matter, momentum and energy, but far from fully understood. We have recently constructed a numerical model for directly simulating the interactions between air and water across free interfaces. The code is characterized by the following important numerical aspects: (1) the fluid dynamics is computed by the VSIAM3 (Volume/Surface Integrated Average based Multi-Moment Method), a 3D finite volume method using multi-integrated moments (2) the moving interface is explicitly captured by an efficient algebraic front capturing method, THINC scheme. We have conducted test simulations for the wind-driven waves across the air/water interfaces using the Earth Simulator and it has been shown that our numerical code is practical and efficient to calculate largescale simulations.
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金子 堅司, 原 雅史, 榎本 和城
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金子 堅司, 山本 博靖, 榎本 和城
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松田 昭博
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A thermodynamic modeling of rubber was proposed for the purpose of evaluating long term thermal aging stability of rubber seals. The finite element analysis code that was developed based on the proposed formulations, apply the hyperelastic constitutive equation to mechanical property, un-stationary heat conduction equation to thermal property and the chemical kinetics theory to chemical reaction. Approximately 20 numerical parameters that required for the finite element analysis code, were determined by material test results and numerical simulations were conducted for a rubber seal in supposed kinematic geometries ; therefore, configurations of chemical reaction caused by thermal environments and softening phenomena of mechanical stiffness were evaluated easier than former methods.
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今谷 勝次
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An anisotropic material model is applied to three dimensional simulation on inhomogeneous deformation in polycrystalline aggregate. The variation of stress-strain response appears due to the anisotropy and macroscopic homogeneity is achieved in polycrystalline model in the way that the macroscopic stress-strain responses seem to be homogeneous. However each crystal reveals complicated responses due by the neighborhood. It is found that the microscopic inhomogeneity is governed by the misfit of anisotropy between the neighboring grains.
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平野 明彦, 坂根 政男, 濱田 直巳
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This paper studies the critical indentation distance in multiple hardness testing. Finite element analyses were carried out simulating Brinnell, Vickers and Rockwell A and C hardness testing. The critical distance recommended in JIS did not cover the critical distance judged from the overlap of plastic deformation in the former three hardness testing but that had excessive margin in the latest hardness testing.
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長岐 滋, 大下 賢一, 林田 武士
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The elastic-plastic deformation of perforated sheet is analyzed by finite element method in terms of the modified Gurson's yield function, where the anisotropy of damaged materials is taken into account through the damage tensor and the net stress tensor. The damage tensor represents the state of damage due to distributed holes and is determined by the method using voronoi tessellation which divides a perforated sheet into many polygons. Each polygon has a hole in it and is transformed into a representative unit cell which is used to define both the damage and the net stress tensors. Perforated sheets with randomly distributed holes were set up as the plane models of damaged materials and were examined under the condition of biaxial tension. Experimental results show that the fracture pattern of perforated sheets and local plastic deformation are well described by the modified Gurson's yield function.
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渡部 修, Bopit BUBPHACHOT, 笠原 直人, 川崎 信史
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This paper is to evaluate the fatigue strength for the perforated plate at elevated temperature based on Stress Redistribution Locus (SRL) method. The test specimens are made of SUS304 stainless steel, and temperature is kept to be 550℃, and the geometry of the perforated plate specimens are changed by number of holes and diameter size of the hole. The SRL method is used to predict number of cycle of crack initiation (N_c), and the failure (N_f) for the perforated plate.
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矢嶋 泰基, 堤 成一郎, 豊貞 雅宏, 尾崎 伸吾, 橋口 公一
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In order to simulate the elasto-plastic friction phenomenon caused by cyclic loading between two contact bodies, the extended subloading surface and subloading friction models are incorporated in the finite element method. The former model is able to describe the accumulation of plastic strain induced by cyclic stress under the yield stress, and the latter one is able to describe the accumulation of sliding displacement by the repeated tangential traction under the limit friction stress. By applying these models to the finite element analysis, the responses in cyclic stress and friction problems of metal-to-metal are examined.
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山田 貴博, 松井 和己
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The two scale problem to compute the local response of heterogenious media and the deformation of the overall structure can be recognized as a coupled problem to evaluate the interaction between the microscopic and macroscopic displacements. In this paper, the block Newton method, which is an efficient solution method for nonlinear coupled problems, is applied to develop efficient numerical algorithms for this problem.
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二木 孝介, 萩原 芳彦, 大谷 眞一, イラワン Y.S.
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Fatigue cracks in pure aluminum rolled sheets do not propagate to the mode I direction, but to the rolling direction as mixed mode I+II condition when rolling direction is about 30 degrees from the tensile fatigue load. In order to clarify the cause of this phenomenon, fatigue crack growth path, crystal grain sizes and crystal orientation were investigated of pure aluminum rolled sheets. As the results, the crystal grain size doesn't affect the fatigue crack growth path. The fatigue crack growth path doesn't orient to the rolling direction after annealing. On the other hand, the effect of annealing time and temperature control the crack growth path. In addition, the textures of slip plane (111) affects fatigue crack growth paths.
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木下 種之, 森本 秀夫, 仲町 英治
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In this study, the initial crystal orientation affects on the yield stress and the hardening evolution in the crystal plastic deformation process has been recognized through the in-situ crystal orientation measurement by EBSD. Uniaxial tensile tests are carried out evaluate the initial yield stress and the hardening evolution by Schmid's factor of the primary active slip. Two identification laws were employed, such as a n-power law and a hyper-tangent law, for the stress-strain curves in cases of four initial orientations single crystal irons.
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前田 喬之, 上辻 靖智, 倉前 宏之, 森本 秀夫, 仲町 英治
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発行日: 2006/09/15
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In this study, the multi scale analysis code is developed by employing a three dimensional (3D) micro polycrystal structure representative volume element (RVE). These were applied to predict the plastic strain induced yield loci in the macro scale, and simultaneously the crystal texture evolution in the micro scale. We measure crystal morphologies by using the SEM-EBSD apparatus with a unit of about 3.8μm voxel, and define a three dimensional (3D) representative volume element (RVE) for the micro polycrystal structure, which satisfies the periodicity condition of crystal orientation distribution. Next, the "semi-implicit" crystallographic homogenization FE code, which employs the SEM-EBSD measured RVE, is applied to automotive sheet metals to predict the texture evolution and the subsequent yield loci in the various strain paths. These "semi implicit" FE results reveal that the plastic strain induced anisotropy in the micro and macro levels can be predicted by our FE analyses.
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近藤 了嗣, 大橋 鉄也
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Slip deformation in mono crystal model, in which spherical shaped high dislocation density inclusion is embedded, is subjected to tensile load is investigated by a finite element crystal plasticity analysis code. Accumulation of geometrically necessary dislocations (GNDs) and statistically stored dislocations (SSDs) are studied in detail. Formation of GN dislocation structure was expected to take place depend on heterogeneous of initial dislocation density. However, results of the analysis show not only formation of GN dislocation structure but also SS dislocation structure on the primary slip system in the form of band and development of strain hardening of crystal grain is making remarkable. Mechanism of SS dislocation pattern formation are discussed from the viewpoint of effect of dislocation interaction and disclination type deformation field.
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山木 直, 堀部 尚裕, 青柳 吉輝, 志澤 一之
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発行日: 2006/09/15
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A multiscale model on dislocation patterning of cell structure and subgrain for polycrystal is newly developed on the basis of reaction-diffusion theory. We introduce a threshold value of slip for stage transition corresponding to the initial crystal orientation into a dislocation mean free path model so as to express the dependence of three-stage hardening on the initial crystal orientation of each grain. A FD simulation for dislocation patterning and a FE one for crystal deformation are simultaneously carried out for a FCC polycrystal under severe strain condition. Reflecting stress value on stress-effect coefficients, it is numerically predicted that the evolution of dislocation pattern in a polycrystal is different in response to the stress condition of each grain. Moreover, the formation of GN boundaries with large misorientation angle is observed along subgrain walls due to large deformation.
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中川 一人, 星野 和義, 朝比奈 敏勝, 村田 守, 日秋 俊彦, 辻 智也
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Water of 648K and 22.1MPa or more is called super critical water, and it has an excellent organic solvent characteristic. Recently, the application of supercritical water in various fields has been tried. However, metal corrodes in supercritical water environments, especially, reactive containers corrode remarkably with hydrochloric acid caused in processing of PCB. Therefore, the corrosion of reactive containers and their longevity are serious problems. It is important to make a long-life reactive container. In this study, the corrosive behavior of nitrided SUS316L was investigated in supercritical water at 523 to 873K and 30 to 35MPa for 2.6×10^5 to 5.22×10^5 sec. Similar test of a surface treated specimen was also carried out. The result was that the corrosion rate increased as the examination temperature increased in all materials.
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安藤 嘉珠, 吉田 一也, 小巻 謙一
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Easy-release screw using shape-memory alloy washer for easy recycling of materials has been developed. Products assembled with the screw can be easily disassembled by just heating them up to a preset temperature for opening the washer. This paper experimentally analyzes the opening characteristics of the washer. The results show that the opening temperature strongly depends on the transformation point shape memory alloy and the opening temperature can be controlled by adjusting the heat temperature and processing.
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羽賀 俊雄, 乾 秀喜, 阪口 洋, 渡利 久規, 熊井 真次
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Strip casting of A6061 alloy was tried using a vertical type twin roll caster with 1500mm of diameter rolls. Use of copper rolls, non-use of lubricant, and low load contributed to improve the cooling rate and casting speed of the strip. A6061 alloy could be cast into the strip continuously at the speed of 60m/min. The microstructure was very fine. It's could be cold-rolled without homogenization to 1mm. A6061 strip could be bent 180 degrees without occurrence of crack at the outer surface or breaking.
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羽賀 俊雄, 乾 秀喜, 阪口 洋, 熊井 真次, 渡利 久規
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Roll casting of AC4C aluminum alloy was tried using an unequal diameter twin roll caster. This caster was equipped with a lower roll of 1000mm in diameter and an upper roll of 300mm in diameter. A cooling slope was used to make semi solid slurry. The casting speed was 20m/min, and thickness of AC4C strip was 4.5mm. The AC4C strip could be cold rolled down to 1.0mm without homogenization. Rolled and T4 heat treated AC4C strip was not broken in 180 degree bending test (R=0.5), and limiting drawing ratio of 2.0 was obtained.
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楠本 大典, 鯉塚 章央, 宮本 政英, 中野 公彦, 河野 俊一
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発行日: 2006/09/15
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Recently, the plastic film is used as wrapping and industrial materials in a wide field. Especially the demand of a contractility heating plastic film increases because this film can adjust to wrapping the varied merchandise. In this research, the deformation of the plastic film was simulated when the plastic film is stretched by the internal pressure and tension in both machine direction and transverse direction of the film. Then, it reports on the result of doing a basic examination by finite element method (FEM) considering tensile characteristic in which temperature dependency.
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田尾 隆幸, 坂井 建宣, 宗宮 詮
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Shape Memory polymer (SMP) is known to have visco-elastic behaviour. Shape recovery is considered to occur due to this visco-elastic behaviour. On the other hand, creep behaviour may also occur that is known as one of visco-elastic behaviour. It is important to understand creep behaviour, because it effects on material's reliability. This research examined the creep behaviour using the SMP, and creep behaviour and influencing factor were investigated by three point bending creep test. As a result, time and temperature dependence was confirmed, and also physical aging has a large effects on creep behaviour. To be more precise, creep deflection was suppressed with increasing of physical aging treatment time. In physical aging time for 1000min, master curve can be drawn by superposing the creep compliance curves, and SMP conformed to Arrhenius type of time-temperature superposition principle.
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浅見 愁太, 石川 圭介, 小林 康男
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Shape memory gel is a much interesting and attractive material for the application to the soft systems. The typical gel is the polymer, which is composed of acrylic acid (AA) and stearyl acrylate (SA). The polymers are cross-linked by N, N' methlenebis. The restoration characteristic depends upon the ratio of AA and SA as well as the amount of the cross-linker. We carried out the fundamental experiments on the gel to understand the restoration properties and to optimize the performance. The optimized gel was found in the proper ratio and amount. An elastic modulus and temperature dependency were considered.
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図子 誠, 石川 圭介, 小林 康男
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Restoration properties of foam depend upon the history of the load and temperature. Since low repulsion foam has a unique characteristic, it is extensively applied. The loading and temperature would bring the effect to the restoration properties. The experiment was carried out for three kinds of low repulsion foam and the common foam to evaluate the effect of the history on the restoration properties.
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中川 文, 鈴木 浩文, 山本 雄士, 森脇 俊道, 沖野 正, 土方 祥雄
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In this report, ultra precision cutting of hard and brittle crystal materials with fly cutting which is one of the interrupted cutting was newly proposed and tested. In this experiments, single crystal germanium was cut with proposed diamond fly cutting, to examine the influence of crystal orientation and the change of critical undeformed chip thickness in 0, -15, -30, -40 degrees of the tool rake angle. From the experimental results, critical undeformed chip thickness was largest in -30 degrees of the tool rake angle, and the undeformed chip thickness was 235nm which is about 4 times compared with the conventional turning.
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山本 雄士, 鈴木 浩文, 森脇 俊道, 沖野 正, 土方 祥雄
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This report deals with the precision grinding of micro fresnel shape with many micro grooves and precision molding of micro glass fresnel lenses. Fresnel lenses are useful for the next generation type of optical devices because of its thin structure and excellent optical characteristics. In the conventional machining method, the lens materials were restricted to plastics, because the cutting tool was a single crystal diamond and the mold material was restricted to a soft metal such as copper or electroless deposited nickel-phosphorous (Ni-P) alloy. In this study, a new grinding method and a new sharp edge truing method were developed and the molds of glassy carbon for glass lenses were ground in trial and a ultra precision glass lenses were molded.
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山田 俊輔, 峠 睦, 渡邉 純二, 松本 匡史
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Ultrasonic motors are usually operated by the mechanism with the expanding and contract of piezo-electric elements. Ultrasonic motors are characterized by a high torque at low-speed without the decelerator. There are few influence of the magnetic field on the precious motion of the motor. This motor could be miniaturized owning to the simple structure. From these characteristics the ultrasonic motors are expected to be applied to driving source etc. of the micro-machine driven in a small area. In this research, we processed the micro-moving drive with the ultrasonic liner motor. The machining accuracy of height relation of each leg was suppressed with 4μm by using the lapping process. The vibration amplitude of each leg was measured by the laser Doppler vibrograph. The driving experiment equipped with the completed micro-moving device was performed and the best driving condition was examined by the micro-moving device.
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浦山 信二, 峠 睦, 鳥居 修一, 渡邉 純二
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The heat sink and the fan have been equipped as the discharge device for the accumulated heat inside of a notebook PC and digital appliances. The development of innovative heat dissipation technology would be expected from their causing noise and the increase in the cost. In this research, the high efficient heat dissipation thin board was developed by forming the fine slots in a micrometer order. As result of the experiment, the heat dissipation performance was found to be improved using the micro fin.
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高野 広樹, 渡邉 純二, 峠 睦, 嶋田 翔, 鈴木 清
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In this study, the novel dicing technology was proposed and applied to form the GaN laser diode resonator. The resonator facet is diced by a fine grain diamond wheel with slurry cutting fluid, which can form the cut surface to mirror by particle collision at the same time when cutting down the GaN laser diode from the wafer of GaN on sapphire substrate. We succeeded in reduced the tilt angle of GaN sidewall by the new cutting processing with supplying slurry superimposed ultrasonic vibration. The effect that the slurry attaches directly to the diamond blade without air film was expected.
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渡邉 純二, 峠 睦, 長野 智和, 吉田 篤, 富田 晋平
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発行日: 2006/09/15
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Many researches of the gene using the gene alteration mice have been performed. However, 600,000 kinds of mice are produced for the elucidation of gene function. For this reason, the microchip for individual discernment for discriminating and managing huge kind of mouse must be developed. In this research, the detailed structure and functions of the micro pressure sensor were investigated by the FEM analysis. About 144 kinds of sensors are made in consideration of an analytical result. A basic character of the pressure sensor to measure the ventricular rate with this device was clarified. Two kinds of micro pressure sensors the number of cardiac beats were actually mounted, and were measured. As a result of conducting evaluated experiments clear periodic signals was observed, and there were confirmed as cardiac also in beats by the power spectrum analysis.
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齋藤 弘宗, 前川 克廣, 御田 護, 齊藤 寛, 松葉 頼重
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セッションID: 2716
発行日: 2006/09/15
公開日: 2017/08/01
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We have examined laser sintering conditions for minute wiring using Ag NanoPaste^[○!R], and evaluated sintering characteristics. First, line patterns were drawn on a Cu substrate by ink-jet printing with the paste: about 80μm in width and about 2μm in thickness. Then, the specimen was dried at 443K for 20min to anchor the paste. Laser sintering of the dried pattern was carried out twice in a row by scanning a beam at average laser powers of 1.99W and 4.45W in air, where a pulsed Nd: YAG laser of 1.06μm wavelength and 0.1mm spot diameter was used. As a result, the Ag nano particles (5nm in average diameter) dispersed in the paste are welded to form coarse agglomerate of about 0.4μm. Adhesion strength between the sintered wire and the substrate was evaluated by a bend-peel test. No separation occurs, which means that strong wiring is achieved by the proposed method.
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宮坂 寛, 早乙女 康典, 井上 明久
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セッションID: 2717
発行日: 2006/09/15
公開日: 2017/08/01
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Superplastic forming of metallic glasses is useful for fabricating micro- and nano-devices. This material exhibits Newtonian viscous flow between the glass transition temperature T_g and the crystallization temperature T_x. During the heating, T_g and T_x increase and the normal viscosity l decreases with increasing heating rate. As an application of this phenomenon, characteristic microforming should be performed during rapid heating, at very high strain rates and under low stresses. In this paper, we developed a new microforming system based on the characteristic behavior of Zr-based metallic glass under rapid heating. Using this apparatus, microforging was carried out within a few seconds. The system would be most effective in the mass production of micro parts for MEMS.
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福田 泰行, 早乙女 康典, 木村 久道, 井上 明久
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セッションID: 2718
発行日: 2006/09/15
公開日: 2017/08/01
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Nanoimprint technology is a promising method for mass production of micro- and nano-devices with low cost. Viscous materials such as thermoplastic materials and oxide glasses have been used for nanoimprint and metallic glasses also exhibit perfect Newtonian viscous flow in the supercooled liquid state and superior nano-formability under very low stresses. In this study, we fabricated the nano-dies with periodic structure of 50nm or less in intervals by FIB assisted CVD and Reactive Ion Etching (RIE) of SiO_2, and by using these dies, nanoimprint of Pt-based metallic glass was successfully performed. We observed traces of slip at nanoimprined area on the surface of the specimen and the trace was caused by a macroscopic material flow along die surface associated with vertical compressive deformation. These results demonstrate the performance of the fabrication method of nanodies and that the metallic glasses are expected for one of the most promising materials for nanoimprint.
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小林 将士, 早乙女 康典, シャルマ パーマナント, 木村 久道, 井上 明久
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セッションID: 2719
発行日: 2006/09/15
公開日: 2017/08/01
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We designed and fabricated a diaphragm for hybrid structured pressure sensor of metallic glass and (100) Si. Metallic glasses are known to be homogeneous and isotropic in nanometer scales and they exhibit high strength, low elastic coefficient, large elastic strain and superior material functions such as corrosion resistance at a room temperature. This material also exhibits Newtonian viscous flow in the supercooled liquid temperature range between the glass transition and the crystallization temperature. In this study, we developed a sputtering target and deposited Zr-based metallic glass film on the (100) Si substrate by RF magnetron sputtering technique. By successive silicon process such as lithography and anisotropic etching, a hybrid structure of metallic glass and (100) Si has been fabricated. These fabrication processes demonstrate the advantages of metallic glasses and a technique for producing hybrid structured MEMS devices.
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黒川 正也, 老子 真人, 藤橋 政人
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セッションID: 2720
発行日: 2006/09/15
公開日: 2017/08/01
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A patterning method of micro-flow shapes with ribs along both sides of the micro-flow path has been developed using synchrotron radiation (SR) and double x-ray masks in this study. By setting the alignment of the masks precisely, the pattern with ribs along the both sides of micro flow path without position gaps was able to be exposed on a polymethylmethacrylate (PMMA) plate successfully. A nickel (Ni) mold part was made by electroforming nickel on the patterned PMMA plate, and PMMA microfluidic device was produced using this Ni mold part and injection molding technique. The effect of the ribs for bonding with a cover plate was confirmed in comparison with that of a conventional plastic microfluidic device.
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劉 富剛, 木内 啓太, 槌谷 和義, 安永 暢男
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セッションID: 2721
発行日: 2006/09/15
公開日: 2017/08/01
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In order to produce a high quality SMA thin film for MEMS, we focus on the search of the best conditions to control the stoichiometric composition of the TiNi thin film deposited by ECR (Electron Cyclotron Resonance) sputtering method. In this research, the most significant factors in the factors of Ar gas flow rate, input power and Ni/Ti target area ratio are optimized by using the experimental design method, which can estimate priority factors from a comparatively small number of experiments are investigated. The chemical composition was measured by SEM-EDS and ESCA. The effect of the Ti/Ni target area ratio showed 88% of contributing rate for the chemical composition.
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柿下 健一, 西籔 和明, 田中 茂雄
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セッションID: 2722
発行日: 2006/09/15
公開日: 2017/08/01
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Micro metal powder injection molding (μ-MIM) needs more sophisticated techniques than the conventional MIM. The use of finer powders is one of solutions to improve the dimensional accuracy and surface roughness of sintered products. This study aims to investigate the effectiveness of nano powder in μ-MIM process. To produce the tiny specimens with high trial efficiency and a small amount of feedstock, a novel experimental machine which can achieve to mold without pelletizing was used. Minute pattern specimens were produced with changing the binder content and the size of copper powder. The effects of particle size of metal powder on the tap density, melt viscosity, and surface roughness, microstructure of sintered parts were discussed.
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竹下 温, 渡邉 純二, 峠 睦, 財部 剛, 大久保 誠史, 清田 英夫
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セッションID: 2723
発行日: 2006/09/15
公開日: 2017/08/01
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In this study, after controlling the nucleation position and form of a CVD diamond film where the application to a field will probably be expected from now on, film growth which is selective and a specific pattern is tried. Moreover, growth of high nucleation density and high quality diamond film for a short time is made into the target. Therefore each substrate pretreatment technology was tried and development of the formation technologyfor forming a precise, flat and smooth film is performed. Especially, as the new technology which can control a nucleationposition, the new pretreatment method that the ultrasonic vibration is added to movement of the small ball made from stainless steel is developed.
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川向 尚, 柏木 啓伸, 洪 錫亨, 渡邉 純二, 峠 睦, 桐野 宙治, 江龍 修, 松本 泰道
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セッションID: 2724
発行日: 2006/09/15
公開日: 2017/08/01
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This research was carried out in order to develop the ultra-precision polishing technology of the single crystal diamond substrate. This substrate is expected to apply to a substrate for the next-generation semiconductor element used under specific environment. In this polishing process, after the carbon atoms are excited up to band gap energy of diamond by the photon energy, and the carbon atom will be finally oxidized. The oxidized carbon layer could be removed as CO or CO_2 during this polishing. As a result of evaluation of diamond (100) and diamond (111) polished surface by WYKO (interferometer microscope) and photon microscope, the high polishing rate and the good surface roughness (Ra:0.3nm) were confirmed.
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小柳 潤, 後藤 由利香, 八田 博志, 向後 保雄, 塩田 一路
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セッションID: 2725
発行日: 2006/09/15
公開日: 2017/08/01
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Strength of carbon-carbon composites (C/Cs) is extremely lower than that of CFRP. One of the main factors of this fact is that the fiber/matrix interfacial strength of C/Cs is too high. The strong interface causes high stress concentration owing to load transfer from broken fibers onto adjacent intact fibers resulting in tensile fracture units into large bundles and low tensile strength in C/Cs. In author's previous work, it has been verified that the C/C with poor interface was improved the tensile strength. This was only qualitative insight, so that the results should be quantified. In this paper, an elementary model describing the C/Cs' tensile fracture is presented. The model has two steps ; 1) the tensile strength of bundle C/Cs is derived from Weibull distribution of the single fiber strength as a function of the bundle thickness, 2) C/C specimen strength is estimated using the bundle strength distribution. Thus, the model expresses the failure stress of C/Cs in terms of the Weibull distribution of the single fiber strength and the size of the fracture bundle. The analytical result show reasonable agreement with the experimental results in spite of several rough assumptions adopted in this model.
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浦田 昇, 大木 順司, 合田 公一, 遠藤 康弘
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セッションID: 2726
発行日: 2006/09/15
公開日: 2017/08/01
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Creep behavior of carbon-carbon (C/C) conposite was investigated through high temperature creep tests, where temperatures were T=800℃ and 1000℃ and stress level was in the range from 90% to 95% of tensile strength at room temperatre. Primary creep and secondary behaviors were shown in the ceep curve in each test condition. The minimum creep rate which was obtained from the creep curve in the secondary creep stage exhibited a dependence on both of the temperature and the stress level. After the creep tests, the fracture site and the specimen surface were observed to investigate the mechanism of the creep fracture. The multiple fracture in 90° layer, which caused in earlier stage in creep, could induce the debonding at the interface between 0° and 90° layers, and finally tensile fracture occurred in the 0° layer. The configuration of fracture surface in creep was almost flat.
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林 利光, 若山 修一
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セッションID: 2727
発行日: 2006/09/15
公開日: 2017/08/01
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The 3D-woven SiC/SiC composites with the transpiration cooling structure were evaluated in comparison with the composites without the cooling structure, under high temperature and thermal cycling conditions. A surface of the specimen was heated by burner furnace and cooled by atmospheric air during the thermal cycles. The other side surface was continuously cooled by pressured air during the thermal cycling. The residual bending strength after the tests were measured and compared to the strength of untreated samples. As a result, the SiC/SiC composites with the transpiration cooling structure showed almost no decrease in strength and the other composites showed large decrease in strength with cracks that formed perpendicular to fiber yarns on heated surface. It is concluded the cooling structure in the SiC/SiC composites improves the resistance under thermal cycling.
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二橋 勇気, 西籔 和明, 松崎 覚, 田中 茂雄, 小谷 政規
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セッションID: 2728
発行日: 2006/09/15
公開日: 2017/08/01
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This study aims to develop a heat-resistant composite material with high safety and reliability towards realization of re-use type space transportation system. Silicon carbide (SiC) which has high thermal conductivity and chemical inactive was adopted. To modify the brittleness of SiC, the micro-porous materials were produced by powder space holder (PSH) method. The production conditions of SiC porous materials and SiC fiber reinforced SiC porous composite material were considered. The problems of the heating process of SiC precursor polymer were solved by changing the particle size and the mixture ratio of pore formation materials. Consequently, SiC porous materials without crack with homogeneous open porous structure were obtained.
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小谷 政規, 小笠原 俊夫, 八田 博志, 石川 隆司
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セッションID: 2729
発行日: 2006/09/15
公開日: 2017/08/01
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The influence of each constituent of SiC/SiC composite, i.e. fiber, interface and matrix, on the fracture mechanism and mechanical properties were experimentally studied. As main factors in manufacturing, the carbon thickness of interface, and the kind of precursor polymer of the matrix, the blending rate of filler particle, and the number of densification processing were interested. As a basic structure of various reinforcing structures, systematic evaluation was carried out for the bundle composites which were composed of a fiber bundle densified with a matrix. The specimens were prepared by chemical vapor infiltration to form an interfacial carbon layer on Tyranno-ZMI fiber and polymer impregnation and pyrolysis to form a matrix in the fiber bundle. The specimens were evaluated by tensile test, fiber push-out test and electron microscopy etc.
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白川 竜二, 原田 祥久, 鈴木 隆之, 平野 一美, 寺本 徳郎
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セッションID: 2730
発行日: 2006/09/15
公開日: 2017/08/01
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The influence on corrosion of Melt Growth Composites (MGC) such as Al_2O_3/Y_3Al_5O_<12> (YAG), Al_2O_3/GdAlO_3 (GAP) or Al_2O_3/Er_3A1_5O_<12> (EAG) was investigated at 1500℃ in a high water vapor pressure environment for time up to 800h. There was observed the flexural strength, the fracture surface, the surface roughness and the microstructure changes after corrosion tests. The strength degradation was seen the strength decreased down to about 69〜75% after corrosion test at 1500℃ in PH20=150kPa up to 800h. The fracture surface showed that the fracture was initiated at surface flaws due to etching by corrosion. The surface roughness increased with increasing corrosion time. The Al_2O_3/GAP system was seen the broad peak (100〜1200cm^<-1>) of Raman spectrum, which caused the microstructure changed into amorphous phases.
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