-
奥田 昇也, 小林 宏彰, 米澤 政昭
原稿種別: 本文
セッションID: 1259
発行日: 2008/08/02
公開日: 2017/08/01
会議録・要旨集
認証あり
This paper is concerned with an importance sampling method combined with the conditional expectation in simulation-based structural reliability assessment with multi-failure modes of the load and resistance parameters. First, to reduce the number of the basic random variables, let the limit state function redefined by the expected value and variance of the original one and Some limit state functions contributed to the failure probability are choosed. Second, approximated optimal importance sampling marginal densities are expressed to be proportional with the value of the conditional failure probabilities and the original p.d.f.. Next, an importance sampling simulation is executed by using importance sampling densities above determined. The proposed method gives the accurate failure probability with shorter processing time.
抄録全体を表示
-
伊藤 操, 佐藤 孝洋, 天摩 勝洋
原稿種別: 本文
セッションID: 1260
発行日: 2008/08/02
公開日: 2017/08/01
会議録・要旨集
認証あり
For ultra light MAV (micro air vehicle), low-density expanded polypropylene (EPP) has been noticed with keen interest. In this study, mechanical properties and optimal structure of Low-density EPP are investigate by bending and torsion tests. Bending and torsional rigidity are evaluated on the rib, truss and honeycomb structures. The deformation of the structures are analyzed using a finite element method and the maximum displacements are compared with experimental data. The results indicate that the truss structure dose exhibit higher rigidity and the structures reduce the weight of 20% , comparing with the bulk specimen.
抄録全体を表示
-
大政 光史, 榊 崇好
原稿種別: 本文
セッションID: 1261
発行日: 2008/08/02
公開日: 2017/08/01
会議録・要旨集
認証あり
The truss type honeycomb panel is three laminar structure that sandwiched a core part molded as wave pattern with two pieces of plates. The core parts of the wave shape molded by press or extrusion molding and produced more relatively easily than general honeycomb panel with a core of the hexagon. This truss type honeycomb panel was analyzed, and it was examined the influence that core shape gave stiffness and strength of the whole panel. The maximum stress became higher in a neighborhood of the joint with the core part and the surface plate. The stress did not decrease when fillets added to the joint parts,. When a cross-section of the core part became triangular, strength and stiffness increased.
抄録全体を表示
-
小川 順樹, 田中 幹人, 小久保 邦雄, 宿谷 知弘
原稿種別: 本文
セッションID: 1262
発行日: 2008/08/02
公開日: 2017/08/01
会議録・要旨集
認証あり
In Japan where the earthquake occurs frequently, it is very important to examine bucking strength of large thin tanks under seismic excitations, but few data for the buckling of tank filled with fluid are found because of the difficulty of experiments. In this research, experiments of cylindrical containers filled with water storage are conducted. The compression stress and the buckling deformation tanks are investigated in these experiments using small tanks made from polyester sheets.
抄録全体を表示
-
北出 浩平, 尾田 十八, 中川 茂憲
原稿種別: 本文
セッションID: 1263
発行日: 2008/08/02
公開日: 2017/08/01
会議録・要旨集
認証あり
It is difficult to analyze theoretically the dynamic fracture of Concrete Block because it is discontinuous fracture behavior. In this research, the impact fracture when the impact body collides with the concrete Blocks is analyzed by using the Distinct Element Method (DEM). DEM is suitable for the analysis of the fracture behavior from the continuous body to discontinuous body. By this research, It clarified how destruction is caused in changing the condition of impact body size, impact body speed and impact body mass.
抄録全体を表示
-
稲村 栄次郎, 遠藤 正樹, 榊原 洋子, 岩本 順二郎
原稿種別: 本文
セッションID: 1264
発行日: 2008/08/02
公開日: 2017/08/01
会議録・要旨集
認証あり
This paper focuses on the stress and the deformation of a thin circular plate, whose surface is loaded by a supersonic jet. It is well known that the self-excited oscillation of the supersonic jet occurs when the jet impinges on an object. If the object is a thin plate, then the plate is deformed by the jet impingement. In order to clarify the influence of self-excited oscillation on the stress and the deformation of the thin plate, the pressure, the temperature and the strain on the plate are experimentally measured at the different nozzle-plate spacings. Using the pressure and temperature in the experiment, the stress and the deformation of the plate is analyzed by the finite element method. The analytical results are compared with those by experiment.
抄録全体を表示
-
山辺 純一郎, 中尾 匡利, 藤原 広匡, 西村 伸
原稿種別: 本文
セッションID: 1265
発行日: 2008/08/02
公開日: 2017/08/01
会議録・要旨集
認証あり
EPDM and NBR composites adding carbon black (CB) and silica (SC) as fillers were exposed to a high pressure hydrogen gas, whose maximum pressure was 100 MPa. Irrespective of kinds of rubber materials, the blister damage of the composites adding SC was slighter than that of the composites adding CB, although both fillers improve the mechanical properties of the rubber materials. This reason is considered to be due to the difference in the hydrogen content penetrated in the composites by hydrogen exposure. i.e., the hydrogen content of the composites adding SC was lower than that of the composites adding CB. These blister damages got heavier with the increase in a hydrogen pressure. With respect to the influence of hydrogen exposure on tensile properties, the decrease in fracture strength by 100 MPa hydrogen exposure can be seen, while its decrease by 10 MPa hydrogen exposure was hardly seen.
抄録全体を表示
-
江角 務, 堤 栄一郎
原稿種別: 本文
セッションID: 1266
発行日: 2008/08/02
公開日: 2017/08/01
会議録・要旨集
認証あり
Since a polymer material has many advantages to order materials such as easy workability and light in weight, more research and development of the material is required. However, the report of the craze occurrence and the growth in the problem of the strength concerning the state of deterioration of the polycarbonate and the state under an environmental influence load is very scarce. In this study, polycarbonate was adopted as a polymer material and ethanol as an environmental chemical. A photoelastic analysis was conducted in order to observe how the environmental chemicals affect the craze and a crack development.
抄録全体を表示
-
近藤 勝義, 今井 久志, 福田 博之, 横田 友佑, 沖本 邦郎, 古月 文志
原稿種別: 本文
セッションID: 1401
発行日: 2008/08/02
公開日: 2017/08/01
会議録・要旨集
認証あり
Metal composite powder coated with un-bundled carbon nanotubes (CNTs) were prepared by using the surfactant (surface active agent), having both hydrophobic and hydrophilic groups, via the wet process and consolidated by spark plasma sintering (SPS) and hot extrusion. Each CNT was independently dispersed in the surfactant water, because the electric affinity between the positive and negative charges due to hydrophobic and hydrophilic groups became larger than van der Waals forces between CNTs. After dipping the metal powder in this water and drying them out at 80C, the isolated CNTs existed on the powder surface. The sublimation point of the surfactant films on the powder surface was determined by differential thermal analysis (DTA). The thermal damage of CNTs during heating to remove the films was evaluated by Raman Spectroscopy and Transmission Electron Microscope (TEM) observation. Optical microscope and Field Emission Scanning Electron Microscope (FE-SEM) observation with Energy Dispersed X-ray Spectrometer (EDS) analysis were carried out on the above composite alloys with CNTs. Microstructures and mechanical properties of powder metallurgy (P/M) extruded pure magnesium and titanium composites with CNTs were examined, and the strengthening mechanism was discussed.
抄録全体を表示
-
片野 元, 近藤 勝義, 今井 久志, 上坂 美治, 小島 明倫
原稿種別: 本文
セッションID: 1402
発行日: 2008/08/02
公開日: 2017/08/01
会議録・要旨集
認証あり
In this study, the evaluation of mechanical properties and microstructures has been carried out on powder metallurgy 60Cu-40Zn alloys with a small amount of transition metals such as chromium and manganese. Raw alloy powder was made by water-atomization process, and consolidated by hot extrusion. When employing chromium as an additive, the tensile strength of wrought alloys drastically increases due to fine grains less than 500nm. In particular 20% increase of TS was recognized compared to the conventional 60Cu-40Zn brass P/M alloy with no additive. There is no morphology change and coarsening of chromium particles, which are dispersed at the grain boundaries of the matrix, during hot extrusion. It suggests fine chromium dispersoids are effective to increase the mechanical properties because of their pinning effect.
抄録全体を表示
-
勘米良 優, 高木 研一, 藤間 卓也, 野口 司, 中込 洋平, 岡田 毅
原稿種別: 本文
セッションID: 1403
発行日: 2008/08/02
公開日: 2017/08/01
会議録・要旨集
認証あり
This study focused on the effect of Cu powder addition on the densification behavior of SUS304 type austenite stainless steel compacts. The powder mixture were compacted by one axis press at 490Mpa, then vacuum-sintered at 1473-1523K for 3.6ks. As a result, the addition of Cu powder is effective to the densification of the austenite stainless steel, and the maximum relative sintered density (91.7%) was obtained with 2mass% Cu powder addition, sintered at 1523K. Moreover, porosity of the compact was remarkably decreased sintered at 1523K. The hardness of the sintered body increased with increasing sintering temperature, same as density. In addition, remarkable grain growth was not observed with increasing temperature.
抄録全体を表示
-
中山 英樹, 戸田 拓夫, 京極 秀樹
原稿種別: 本文
セッションID: 1404
発行日: 2008/08/02
公開日: 2017/08/01
会議録・要旨集
認証あり
The effect of powder characteristics on the mechanical properties of martensitic stainless steel fabricated by MIM was investigated. The specimens were made by injecting the mixture of water atomized or gas atomized powder and a polymer binder into a metallic mold. The compacts were debound in air at a temperature between 533K and 593K for 7.2ks. They were sintered in vacuum at 1573K and 1623K for 7.2ks. The carbon content of the sintered compacts decreased linearly with increasing in debinding temperature. This means that the debinding temperature can control the carbon content of sintered compacts accurately. The tensile strength of the sintered compact of the WA powder decreased as the debinding temperature rises. On the other hand, the tensile strength of the sintered compact of the GA powder increased as the debinding temperature rises.
抄録全体を表示
-
今井 久志, 近藤 勝義, 上坂 美治, 小島 明倫
原稿種別: 本文
セッションID: 1405
発行日: 2008/08/02
公開日: 2017/08/01
会議録・要旨集
認証あり
Brass is widely used as industrial material because of its excellent characteristics such as high corrosion resistance, nonmagnetic, and good machinability. In particular, the machinable brass is obtained by adding lead. However, it is necessary to reduce the use of lead due to the hazardous to the environment and human. In this paper, the uniform distribution process of graphite particles into the brass alloy by powder metallurgy (P/M), and machinable lead-free P/M brass with graphite additives have been developed. The mixture powder of graphite and 6-4 brass alloy is employed as input raw materials, having a mean particle size of 5μm and 35μm, respectively. It was compacted at 1053K by Spark Plasma Sintering (SPS) to be used as billets for extrusion. The distribution of 1 wt% graphite particles in P/M extruded brass alloys was significantly uniform. The relation between graphitic addition and machinability was investigated.
抄録全体を表示
-
磯西 和夫
原稿種別: 本文
セッションID: 1406
発行日: 2008/08/02
公開日: 2017/08/01
会議録・要旨集
認証あり
The synthesis of WC-Co alloy from elemental powders was investigated. Especially the the forming WC phase during the solid-phase sintering was discussed. The chemical composition of WC-Co alloy was chosen to be WC-20vol%Co. The powder mixture of stoichiometric quantities of elemental powders was mechanical alloyed by using lowenergy ball mill under an Ar atmosphere. After 1800ks milling, the X-ray diffraction profile showed only elemental W phase. At DTA runs, W_2C and Co_6W_6C phase formed about 1140K and then transformed to WC and W_3Co_3C with increasing temperature. Therefore, it is considered that the WC phase synthesized at the sintering process, not milling stage like other investigations using high energy ball mill. 1800ks milled powder was consolidated by using pulse current sintering method at the temperature of 1373K. The compact consisted mainly of WC with Co with small amount of W_3Co_3C. The hardness of the compact was HV1648 and HRA91.8. The 3-point bending strength was about 2GPa.
抄録全体を表示
-
品川 一成
原稿種別: 本文
セッションID: 1407
発行日: 2008/08/02
公開日: 2017/08/01
会議録・要旨集
認証あり
In metal/ceramic graded powder compacts during sintering, the difference in shrinkage among the layers often causes distortions or cracking. To clarify the constitutive response of the heterogeneous powder compacts, a micromechanics model for sintering is proposed. The sintering stress as well as the viscosity of the powder mixtures is expressed by using Eshelby's equivalent inclusion method and Mori-Tanaka's mean-field theory. The variation in densification behavior with metal/ceramic mixing ratio computed by the proposed model is compared with the experimental data for Ni/Al_2O_3 system. The present model can reproduce the decrease in sintering rate of the powder mixtures, which remarkably appears in the Ni/Al_2O_3 powder compacts with small amount of Al_2O_3.
抄録全体を表示
-
湯浅 栄二, 嵐田 浩二, 嵐田 光雄
原稿種別: 本文
セッションID: 1408
発行日: 2008/08/02
公開日: 2017/08/01
会議録・要旨集
認証あり
New elastic silicon rubber mold materials and molding process method for the production of lipstick were developed. In this study, it was investigated that influence of the material properties as composition elements, surface roughness and hardness to quality of formed lipstick. The properties of the silicon rubber mold were different by included composition elements. When the mold with high hardness and smooth surface was used, it was able to formed high quality lipstick.
抄録全体を表示
-
山田 博行, 橋井 光弥, 粂 正市
原稿種別: 本文
セッションID: 1409
発行日: 2008/08/02
公開日: 2017/08/01
会議録・要旨集
認証あり
This paper describes interfacial reaction in pressureless-sintering of hexagonal boron nitride (h-BN) with feldspar at low temperature. In order to improve performance of sintered h-BN with feldspar composite, low purity h-BN and melted feldspar have been utilized for composite. Low purity h-BN contains at least 30 % oxide. Melted feldspar has been used for sintering aid to produce sintered composites at a temperature below the melting point of feldspar. Experimental results show that the bulk density of low purity h-BN with melted feldspar composite was satisfactory results. The relative density of h-BN with melted feldspar composites in air achieved 95.6 % at 1573K sintering, and 96.1 % at 1473K sintering.
抄録全体を表示
-
阪口 誠知, 山下 正人, 花木 聡, 内田 仁, 小西 啓之, 水木 純一郎
原稿種別: 本文
セッションID: 1410
発行日: 2008/08/02
公開日: 2017/08/01
会議録・要旨集
認証あり
We have prepared hard (Ti,B)N thin films by Ion mixing and Vapor Deposition (IVD) technique. The structure of the films was analyzed by X-ray diffraction (XRD) and X-ray Absorption Fine Structure (XAFS) analysis using synchrotron radiation. The hardest film was obtained at the evaporation ratio B/Ti of 0.3. The film consists of TiN crystal and certain kind of boron compound such as TiB_2.
抄録全体を表示
-
大木 基史, 石橋 達駒, 高橋 直之
原稿種別: 本文
セッションID: 1411
発行日: 2008/08/02
公開日: 2017/08/01
会議録・要旨集
認証あり
TiO_2 is one of the photo catalyst materials that are focused due to superior property such as anti-bacterium characteristic. It is an extremely stable material that doesn't dissolve to an alkali, water, and an organic solvent in the normal temperature and the normal pressure, and doesn't react with the gas with a strong reactiveness such as the hydrogen fluoride, chlorines, and hydrogen sulfides. Moreover, it excels as a photo catalyst in durability, and it has a lot of advantages in the economy, stability, and the practicality, etc... There are two kinds of TiO_2 industrially used from the difference of the crystal structure, the Anatase type and the Rutile type. Generally the Anatase type is used from the viewpoint of the photo catalyst revitalization. In this study, the adhesive strength of TiO_2 coating processed by the Sol-Gel method was evaluated by using the scratch test with observation and analysis of scratched surface. After that, influence of the thermal treatment temperature and the dipping procedure on the adhesive strength was discussed.
抄録全体を表示
-
田代 尊久, 三原 雄司
原稿種別: 本文
セッションID: 1412
発行日: 2008/08/02
公開日: 2017/08/01
会議録・要旨集
認証あり
In order to develop an insulation film on metallic surfaces of machine parts for depositing sensors, the materials of SiO_2, Al_2O_3 and ZrO_2 were applied using a Sol-gel method. A spin coating or dip coating was used to form a uniform thin-film and heating temperature was set lower compared with recommendation temperature to prevent change of metal properties. As the results, SiO_2 was not able to obtain high insulation resistance, however the resistance over 200MΩ was obtained by Al_2O_3 coated on substrate with smooth surface. ZrO_2 film yielded the reliable insulating property beyond 200MΩ in the film thickness from 100 nm to 3.6 micrometers by performing annealing in addition to a lower heat treatment condition.
抄録全体を表示
-
高桑 脩, 祖山 均
原稿種別: 本文
セッションID: 1413
発行日: 2008/08/02
公開日: 2017/08/01
会議録・要旨集
認証あり
Impacts at cavitation bubble collapses can be utilized for surface modification in the same way as shot peening. Peening method using cavitation impact was called "cavitation shotless peening (CSP)" as shots were not required. Peening is one of the techniques of surface modification to introduce compressive residual stress to improve fatigue strength of metallic materials and to reduce stress corrosion cracking (SCC). At the same time, CSP can release micro strain introduced mechanical finishing or heat treatment, introducing compressive residual stress in the material. There is a possibility that the large residual stress exists in micro-meter subsurface where less 10 μm from surface and 2D method using 2D detector can evaluate residual stress in sub-surface of polycrystalline metallic materials. Full width at half maximum of X-ray diffraction (FWHM) is closely related to micro strain in grain. In the present paper, stainless steel and Inconel were treated by CSP and residual stress and FWHM were evaluated. It was revealed that CSP decreased FWHM with introducing compressive residual stress in micro-meter subsurface.
抄録全体を表示
-
中川 一人, 星野 和義, 朝比奈 敏勝, 村田 守, 日秋 俊彦, 辻 智也
原稿種別: 本文
セッションID: 1414
発行日: 2008/08/02
公開日: 2017/08/01
会議録・要旨集
認証あり
Supercritical water oxidation (SCWO) is expected as a potential solution decomposition of organic waste, such as PCB and Dioxin. Its high solubility for organic compounds and its special physical properties (i.e., density and viscosity) result in a key advantage over standard processes such as incineration. During oxidation of chlorine organics, severe corrosion attack of most of the materials have been observed as a result of the formation of hydrochloric acid (HC1). While Ni-based alloys are generally considered important for severe service applications, results from laboratory in operation indicate that they will not withstand some aggressive feeds. Therefore, Corrosion control of structural materials is key issue in the applications of supercritical water oxidation to such chemical process. In Ni Cr alloys, the Cr content to 25 and 30 mass% in mass, which was composed of Cr_2O_3 on the surface and which also admitted a high corrosion resistance for 5.0%HC1. In Ni-Cr-Al alloys,the Al content increased up to 3 mass% in mass, which was composed of Al_2O_3, and internal oxidation was controlled.
抄録全体を表示
-
石塚 和則, 高橋 剛, 柴野 純一, 小林 道明, 三浦 節男
原稿種別: 本文
セッションID: 1415
発行日: 2008/08/02
公開日: 2017/08/01
会議録・要旨集
認証あり
In this report, the acceleration phenomena of pitting corrosion in welded materials under freeze-thawing corrosive environment were investigated. An austenitic stainless steel SUS304 with bead-on-plate welding was used as a specimen. Specimens were immersed in various corrosive solutions under cyclic temperature conditions. As the results, the pitting corrosion of specimen speeded up under freeze-thawing environment in the ferric chloride solution. Maximum acceleration of it was appeared at the largest area of the tensile residual stress near the weld line.
抄録全体を表示
-
荒木 邦成, 鶴賀 俊光, 越後屋 恒, 山崎 寿也, 松岡 信一
原稿種別: 本文
セッションID: 1416
発行日: 2008/08/02
公開日: 2017/08/01
会議録・要旨集
認証あり
A lot of plastic laminated films are used in our surroundings, so the welding of the films is essential processing technology. We paid attention to the relation between mechanical properties and the degree of crystallization of polymer, and measured the degree of crystallization of the film in the heat-sealing site. As a result of comparing it with mechanical properties, we found that in the case of CPP (Casted Polypropylene), which has a lot of the side chains, mechanical properties and the degree of crystallization of films are almost linked. However, in the case of HDPE (High Density Polyethylene), which has a little the side chain, these relationship are not linked.
抄録全体を表示
-
高祖 守道, 森田 英俊, 原 要一郎
原稿種別: 本文
セッションID: 1417
発行日: 2008/08/02
公開日: 2017/08/01
会議録・要旨集
認証あり
The scribing process has been performed until now using an edge for high-speed cutting of glass. However, in recent year, the scribing process which guides a crack only to the surface is beginning to spread using the thermal stress generated by laser heating. When this method is compared with the conventional method, it is advantageous that a cross section of glass is beautiful and that the yield rate is high. By this research, it proposes about different new heating point form from conventional laser scribing using CO_2 laser, and the possibility of the scribe processing is described.
抄録全体を表示
-
松岡 信一, 中川 高則, 村井 勉, 中川 文昭
原稿種別: 本文
セッションID: 1418
発行日: 2008/08/02
公開日: 2017/08/01
会議録・要旨集
認証あり
Magnesium alloy is one of the light metallic materials which is utilized in industry, but it is difficult to do its plastic working in the ordinary temperature. After performing to AZ31B magnesium alloy thin plate, the material has a performance of high drawing greatly. In this study, performing is rolling processing. The performing material has more high drawing as ratio of reduction in thickness increases, e.g. high performing material (reduction in thickness : 34%×2) is able to be formed under temperature at 100℃.
抄録全体を表示
-
松岡 信一, 森 哲弥, 村井 勉, 中川 文昭
原稿種別: 本文
セッションID: 1419
発行日: 2008/08/02
公開日: 2017/08/01
会議録・要旨集
認証あり
Cold drawing products obtained from preliminary rolled sheets of magnesium alloy (AZ31B) were studied on their elastic and thermal recovery. In this study, warm rolling is carried out using AZ31B magnesium alloy extrusion. After that, anneal the rolled material, and the mechanical properties, internal structures are investigated. The drawing products obtained from preliminary rolled sheet was found to have extremely good dimensional stability by cross rolling and anneal.
抄録全体を表示
-
松岡 信一, 伍嶋 智彦, 村井 勉, 中川 文昭
原稿種別: 本文
セッションID: 1420
発行日: 2008/08/02
公開日: 2017/08/01
会議録・要旨集
認証あり
Extrusion of hot pressed AZ61 chips has been investigated. We could extrude hot expressed chips at the lower maximum load than that of ingot billets. Additionally, the chip billets, which are low volume fraction contributed to a stable extruding. The size of chips doesn't influence the maximum load. We can obtain sound extrusion shapes by using the chip billets, and we can obtain almost equal mechanical properties compared to ingot billets. The mechanical properties were nonexistent for extrusion temperature.
抄録全体を表示
-
野村 浩史, 尾崎 公一, 福田 忠生
原稿種別: 本文
セッションID: 1421
発行日: 2008/08/02
公開日: 2017/08/01
会議録・要旨集
認証あり
In the present study, the influence of injection conditions on the tensile strength of a plane plate made of AZ91D was examined. The plane plate having a thickness of 2.5mm was molded in a metal die by using a Thixomolding machine and a test piece was cut out from it. The gate velocity was varied between 2.6m/s and 9.9m/s. The molten metal temperature was changed from 848K to 893K. The effect of solution heat treatment was also examined. The tensile strength was increased with an increase in the molten metal temperature. The tensile strength was increased with an increase in the gate velocity especially in the high molten metal temperature condition. In the case that the test piece was given solution heat treatment, the yield stress was decreased and the elongation was increased.
抄録全体を表示
-
荒木 邦成, 越後屋 恒, 鶴賀 俊光, 河野 務, 松岡 信一
原稿種別: 本文
セッションID: 1422
発行日: 2008/08/02
公開日: 2017/08/01
会議録・要旨集
認証あり
The utilization will be expected from the high-insulated characteristic as a tool of energy saving also in the various insulation fields as for the vacuum insulation panel (VIP) in the future. It is necessary to covering VIP more area for energy saving, so that the bending forming method of VIP desired under keeping the ability of thermal conductivities. By measuring the increased amount of thermal conductivity against strain of multilayer film using for VIP, the maximum strain is cleared, and also analysis methods of VIP was established by using structural analysis software. So that the analysis system for bending forming ware able to be calucureted as the reliability about VIP.
抄録全体を表示
-
千葉 雅俊, 笠場 孝一, 星 雄介, 昆 卓広
原稿種別: 本文
セッションID: 1423
発行日: 2008/08/02
公開日: 2017/08/01
会議録・要旨集
認証あり
Forming limit diagram(FLD) is made to evaluate the forming limit strain of sheet materials. However, even if the macro strains on FLD obtained by scribed circles are same, the micro structures of strained sheet metals are not always same. The fracture limits also depend on micro structures, for example whether uni-elongate order grains or equi-elongate disorder grains. In some case, measured strains depend on scribed circle diameters because of strain gradients in circle. Statistical grain strains can be used to evaluate the strain gradients of strained materials.
抄録全体を表示
-
吉田 一也, 杉山 剛
原稿種別: 本文
セッションID: 1424
発行日: 2008/08/02
公開日: 2017/08/01
会議録・要旨集
認証あり
Finite-element method (FEM) analysis of the straightening of drawn wires using rollers is carried out to discuss the optimum straightening conditions and the conditions of each part of the leveler used for straightening. Roller distribution of straightening conditions use slant distribution, it set up easily roller distribution and straighten easily. The conditions during straightening using roller leveller have been determined on the basis of the experience of on-site operators, and the number of related research reports is limited. In this study, roller position, roller diameter and change in roller pitch are examined by FEM analysis to clarify the optimum straightening conditions of wires using rollers.
抄録全体を表示
-
吉田 一也, 小島 政幸
原稿種別: 本文
セッションID: 1425
発行日: 2008/08/02
公開日: 2017/08/01
会議録・要旨集
認証あり
Titanium has great advantages, such as nontoxicity and high biocompatibility. Recently, it has begun to be used with high expectations in the medical field, such as for fabricating guide wire, orthodontic wires and microparts of medical appliances. However, because the plastic workability of titanium is inferior to that of other metals, there is difficulty in manufacturing titanium products, such as extrafine wires and microscrews, without cracks and other defects. In this study, we examined the effects of the amounts of 0 and N on workability and product strength during drawing, heading and rolling, and clarified the optimal conditions for cold drawing. We can infer the magnitude of the drawing limit on the basis of the break strain of mother wire. The fabrication of the guide wire, microspring and microscrews in medical fields as an application of the obtained drawn wire are also targeted in this study.
抄録全体を表示
-
柄沢 元文, 永澤 茂, 福澤 康
原稿種別: 本文
セッションID: 1426
発行日: 2008/08/02
公開日: 2017/08/01
会議録・要旨集
認証あり
In the processing process of white-coated cardboard such as a postal card, the cutting quality on wedged cardboards is empirically known as affected by the piled-up pieces of the cardboards, its friction coefficient, the thickness of coated layer, the blade tip specification and so on. In this work, the effects of mechanical conditions on the cardboard cutting characteristics were experimentally investigated by varying the blade apex angle, the surface roughness of the blade, the tip thickness and the piled-up numbers of cardboard. The followings were revealed: 1) the breaking down, local minimum point of cutting line force was characterized with the blade apex angle and the surface roughness or the tip thickness; 2) the blade indentation stroke for each layer depended on the piled-up numbers and its order; 3) the apex angle of 30 degree is stable for the release of break down layer, while the apex angle of 53 degree is fairly sticky state and unstable for that.
抄録全体を表示
-
柳田 明, 上甲 和文, 小豆島 明
原稿種別: 本文
セッションID: 1427
発行日: 2008/08/02
公開日: 2017/08/01
会議録・要旨集
認証あり
Extensive researches have been conducted on mechanical property and microstructure after severe plastic deformation (SPD) processes. The studies on mechanical properties were conducted, a general tendency that strength increases and elongation decreases as the applied strain increases. However the formability of materials after SPD processes was little studied. Therefore we investigated the formability of steels subjected to different cold forming processes. In this study, the workability of ECAEed carbon steesls was investigated and ductile fracture was studied by the formability test. Three kinds of work-piece were prepared by ECAE process, rolling and combined process, respectively. All processing were carried out under the condition of the room temperature. Experimental result was evaluated with cumulative equivalent strain. The difference of workability for each process was discussed by EBSP analysis.
抄録全体を表示
-
桑鶴 貞雄, 塚原 修一, 東浄 沢間, 小竹 茂夫, 鈴木 泰之
原稿種別: 本文
セッションID: 1428
発行日: 2008/08/02
公開日: 2017/08/01
会議録・要旨集
認証あり
-
山本 普康, 佐々木 万作, 北村 隆宏
原稿種別: 本文
セッションID: 1429
発行日: 2008/08/02
公開日: 2017/08/01
会議録・要旨集
認証あり
The experiments for cold rolling of stainless steel and carbon steel sheets were made to measure the friction coefficient between rolls and a material, the surface characteristics of rolled sheets and the width spread ratio of sheets. Then, the effect of roll surface profiles on the friction coefficient and the characteristics of rolled steel sheets was discussed. As a result, it has been shown that the friction coefficient in cold rolling with rolls polished by #800 polishing paper in axial direction is smaller than that in circumferential direction, and that the friction coefficient in cold rolling decreases with increase of the ratio of flat area on rolled sheet surface.
抄録全体を表示
-
山下 実, 西村 尚哉, 服部 敏雄, 奥山 智仁
原稿種別: 本文
セッションID: 1430
発行日: 2008/08/02
公開日: 2017/08/01
会議録・要旨集
認証あり
The hat cross-sectional tube was impacted to the rigid plate under the dynamic condition, which exhibited a progressive buckling pattern with multi lobe. The effect of the inertial force arising during impact on the onset of the first buckling lobe was investigated. The inertia force was induced by the solid mass attached to the tube wall. Impact experiment with the aid of drop-hammer was carried out. Experimental observation with a high-speed video camera demonstrated that the position of the first buckling lobe was successfully controlled by the inertial force.
抄録全体を表示
-
岡川 啓悟, 相沢 友勝
原稿種別: 本文
セッションID: 1431
発行日: 2008/08/02
公開日: 2017/08/01
会議録・要旨集
認証あり
The multi-layered seam welding described in this paper is made by flat one-turn coil for sheet metals with high conductivity. Because an aluminum sheet is able to obtain sufficient energy from an electric circuit, and the sheet is accelerated by a large electromagnetic force and collides with the fixed other sheet with a gap. Both these surfaces can be clarified by the effect of the collision, and then joined with each other by both the electromagnetic force and the joule heat generated in the aluminum sheet. The bank energy required for this welding is less than 3.5 kJ.
抄録全体を表示
-
相沢 友勝, 岡川 啓悟, 花崎 健一
原稿種別: 本文
セッションID: 1432
発行日: 2008/08/02
公開日: 2017/08/01
会議録・要旨集
認証あり
This paper describes a new welding technique for copper foils on flexible printed circuit boards and its experimental results. When an impulse current from a capacitor bank passes through a flat one-turn coil, a magnetic flux is suddenly generated in the coil. Eddy currents are induced in overlapped copper foils on the boards placed on an insulated aluminum sheet and the coil. The foils have a gap between them. The foils can be welded both by the Joule heat generated in them and by the impact effect with pulsed magnetic pressure applied to them. The bank energy required for this welding is less than 1.2 kJ.
抄録全体を表示
-
白本 和正, 武田 崇弘, 井山 裕文, 氏本 泰弘, 甲斐 彰一郎, 藤田 昌弘
原稿種別: 本文
セッションID: 1433
発行日: 2008/08/02
公開日: 2017/08/01
会議録・要旨集
認証あり
For the success of the new explosive welding process proposed reflector is arranged on the short part of the bottom plate closed to the installation block of explosive. It is confirmed by numerical simulation results that the reduction of the underwater shock pressure far from the explosive position is pretty well diminished fry the effect of strong underwater shock wave reflected at the new reflector surface.
抄録全体を表示
-
外本 和幸, PALAVESAMUTHU Manikandan, 森 昭寿, KRISHNAMURTHY Raghukandan
原稿種別: 本文
セッションID: 1434
発行日: 2008/08/02
公開日: 2017/08/01
会議録・要旨集
認証あり
This study demonstrates the ability to consolidate pure magnesium incorporated with fine SiC particles by employing underwater shock wave derived from a high explosive. Microstructural characterization, X-ray diffraction and microhardness-measurement results of the magnesium composites produced by the axisymmetric shock consolidation are reported. The strengthening mechanism in a ball milled and hand mixed composite powders is discussed.
抄録全体を表示
-
浅野 佑介, 今西 輝光, 佐々木 克彦, 片桐 一彰, 垣辻 篤, 成田 吉弘
原稿種別: 本文
セッションID: 1435
発行日: 2008/08/02
公開日: 2017/08/01
会議録・要旨集
認証あり
Vapor-grown carbon fiver (VGCF)/Aluminum composites, which have high thermal conductivity, are fabricated in this paper. The thermal conductivity of the composites is about 2.5 times higher than that of the pure aluminum of the matrix if the direction of VGCF is aligned. To improve the thermal conductivity of the composite materials, small amount of CNTs are added to the composite materials. The composite materials added CNTs have about 20% higher thermal conductivity than the composite materials without CNTs. Finited Element Method (FEM) and Nan model are used to analyze the effect of the CNT addition. The increase rate of thermal conductivity due to the CNTs addition is analyzed well by the FEM analysis. Thermal conductivity is also calculated by Nan model using the results obtained by the FEM analysis.
抄録全体を表示
-
平野 義鎭, 勝俣 慎吾, 岩堀 豊, 草野 英昭, 轟 章
原稿種別: 本文
セッションID: 1436
発行日: 2008/08/02
公開日: 2017/08/01
会議録・要旨集
認証あり
In this paper, artificial lightning strike tests for Cup Stucked Carbon Nanofiber (CNF) dispersed CFRP are performed to investigate the applicability for lightning protection systems. The result of visual inspection and NDT shows that the size and thickness of internal damage comprise of delamination and matrix cracks are affected by changing of CNF content, though the surface damage of fiber damaged area and resin deterioration area are hardly affected. Furthermore, in order to investigate the characteristic of residual compression strength, compression test for damaged laminate were performed in conformity with SACMA CAI test standard. As a result, it is confirmed that the residual compression strength are improved with increasing of the CNF content.
抄録全体を表示
-
小橋 則夫, 田中 和人, 植村 俊基, 桂 孝典, 片山 傳生, 宇野 和孝
原稿種別: 本文
セッションID: 1437
発行日: 2008/08/02
公開日: 2017/08/01
会議録・要旨集
認証あり
The influence of process conditions on the bending property and the impact property of CFRTP(carbon fiber reinforced thermoplastics) / AFRTP(aramid fiber reinforced thermoplastics) hybrid composites has been investigated. CFRTP/AFRTP composites were manufactured by high-speed processing system with induction heating. An experimental design was used to assess the optimal molding condition. The factors for the experimental design are molding pressure, holding time, reinforced fiber and stacking sequence. Effective factor was evaluated by analysis of variance. The optimum molding pressure was between 3MPa and 5MPa. Holding time demands a trade-off between the bending strength and the puncture energy.
抄録全体を表示
-
木内 貴洋, 轟 章, 松崎 亮介
原稿種別: 本文
セッションID: 1438
発行日: 2008/08/02
公開日: 2017/08/01
会議録・要旨集
認証あり
Fiber waviness is one of initial defects during processing such as filament windindg. The fiber waviness is made due to the local fiber micro-buckling of the curing process. The fiber waviness causes reduction of compressive strength of the composite structure. The mechanism of developing fiber waviness is, however, not completely clear. In the present study, a model of generating fiber micro-buckling is proposed. The model is based on the compression load caused by shrinkage of a metal jig. Two faults are considered in the model: bonding between a metal jig and a composite and insufficient cure of the resin. The analysis and experiment based on this model are conducted. The new model successfully predicts the initiation of the fiber micro-buckling.
抄録全体を表示
-
八木橋 泰彦, 星 光, 河井 昌道, 岩堀 豊
原稿種別: 本文
セッションID: 1439
発行日: 2008/08/02
公開日: 2017/08/01
会議録・要旨集
認証あり
Effects of the uptake of water on the constant amplitude tension-tension fatigue behavior of a plain-woven CFRP quasi-isotropic laminate in the fiber direction are examined. First, fundamental features in the uptake of water by CFRP specimens are studied. For this purpose, specimens are immersed in hot water at a constant temperature of 71℃, and their weight gain by water uptake is measured over the period of study. Overall, two different kinds of water uptake behavior of specimens are observed. One is roughly Fickian in nature, and the water uptake tends to saturate in 1000 hours at the level of 1.0% weight gain. In the other case, the weight of specimens immersed in hot water exceeds 1.5% weight gain. Detailed observation of the latter specimens reveals that an artificial material like fur has adhered on the surface of those specimens, and the anomalous increase in weight gain might be ascribed to the adhesion of fur. Next, static tension tests are performed at room temperature on the specimens immersed in hot water until saturation and on the specimens that are not exposed to water environment. The specimens immersed in water show slightly higher tensile strength than the specimens with no water uptake. Then, tension-tension fatigue tests are carried out using those wet and dry specimens. It is demonstrated that the fatigue lives of wet specimens are shorter than those of dry specimens.
抄録全体を表示
-
宮澤 宏慶, 河井 昌道, 高阿田 康弘
原稿種別: 本文
セッションID: 1440
発行日: 2008/08/02
公開日: 2017/08/01
会議録・要旨集
認証あり
Off-axis creep rupture behavior of plain woven CFRP laminates under constant tensile and compressive load conditions at 100℃ was examined, and phenomenological modeling of off-axis creep rupture strength was attempted. First, static tension and compression tests were performed on coupon specimens with five different fiber orientations to examine the fiber orientation dependence of off-axis stress-strain relationship. Then, off-axis creep rupture tests in tension and compression were performed for the five fiber orientations at more than three stress levels, respectively. Test results showed that transient creep behavior was dominant until final rupture, regardless of fiber orientation and of loading direction. The log-log plots of creep stress against the time to rupture were almost linear over the tested range of lifetime for both in tension and compression. On the basis of these creep rupture data, a phenomenological creep rupture model was developed on the basis of continuum damage mechanics. It was elucidated that the creep rupture model succeeded in adequately predicting the observed off-axis creep rupture behavior of the material.
抄録全体を表示
-
天明 寛, 安田 公一, 塩田 忠, 松尾 陽太郎
原稿種別: 本文
セッションID: 1441
発行日: 2008/08/02
公開日: 2017/08/01
会議録・要旨集
認証あり
This study deals with stress analysis for an arbitrary-shaped inclusion with interlayer under out-of-plane shear loading. The elastic analytical solution is derived by the two-dimensional elastic-theory in complex number expression. Here, boundaries of the arbitrary-shaped inclusion and interlayer in physical plane are mapped into concentric circles in mapping plane by conformal mapping. And the stress function in mapping plane is given by analytical continuation. Using this stress function, stress distribution around the inclusion in physical plane are shown by numerical simulation as several examples.
抄録全体を表示
-
松田 伸也, 高橋 学, 黄木 景二, 岡部 永年
原稿種別: 本文
セッションID: 1442
発行日: 2008/08/02
公開日: 2017/08/01
会議録・要旨集
認証あり
In the present study, 4-point bending test was carried out by using porous ceramics to investigate statistical properties of damage-tolerant ceramics. Distribution of the bending strengths plotted on a Weibull probability paper was nonlinear and was very similar to superposed distribution. Consequently, the bending strength distribution was analyzed by cluster fracture probabilistic model with the basis of Markov process assuming the LLS rule. It is found that the probabilistic model agreed well than the 2-parameter Weibull distribution. Therefore this indicates that the bending strength distribution controls cluster size.
抄録全体を表示