Transactions of the Japan Society of Mechanical Engineers. A最新文献_第3页

Shrinkage characteristics of light-cured composite resin 光固化复合树脂的收缩特性

Transactions of the Japan Society of Mechanical Engineers. A Pub Date : 2012-10-17 DOI: 10.1299/KIKAIA.78.1377

K. Arakawa

引用次数: 0

Dislocation-based crystal plasticity modeling and simulation for HCP metals considering evolution of twin-microstructure 考虑孪晶组织演化的HCP金属位错晶体塑性建模与仿真

Transactions of the Japan Society of Mechanical Engineers. A Pub Date : 2012-09-13 DOI: 10.1299/KIKAIA.78.1157

R. Kondo, Y. Tadano, K. Shizawa

{"title":"Dislocation-based crystal plasticity modeling and simulation for HCP metals considering evolution of twin-microstructure","authors":"R. Kondo, Y. Tadano, K. Shizawa","doi":"10.1299/KIKAIA.78.1157","DOIUrl":"https://doi.org/10.1299/KIKAIA.78.1157","url":null,"abstract":"In this study, a dislocation-based crystal plasticity model for HCP crystals considering evolution of twin-microstructure is newly developed. In order to represent an anisotropic glide of dislocation in HCP crystals, a conventional dislocation-crystal plasticity model for FCC crystals is extended to that for HCP one. Additionally, a new deformation twining model based on the phase-field theory is coupled with the above model through an order parameter and resolved shear stress. In this model, elastic strain energy on twin plane and anisotropic interfacial energy between matrix and twinned region are adopted in the Ginzburg-Landau free energy as the bulk energy and the gradient energy, respectively. Using the above models, uniaxial compression tests under plane strain condition for Mg single crystal with different crystal orientations are demonstrated by means of FEM for dislocation-based crystal plasticity analyses coupling with FDM for phase-field one. From the results of the present simulations, it is shown that the present model can reproduce an anisotropic plastic behavior of Mg single crystal. Moreover, lenticular shaped twins as reported in many experimental studies are reproduced by a-axis compression tests.","PeriodicalId":388675,"journal":{"name":"Transactions of the Japan Society of Mechanical Engineers. A","volume":"71 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-09-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133653250","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

静的引張試験による疲労荷重下における[0m/90n]sクロスプライCFRP積層板に生じるトランスバースクラックの発生予測静态拉伸试验在疲劳负荷下，预测在[0m/90n]s交叉CFRP积层板上发生转板断裂

Transactions of the Japan Society of Mechanical Engineers. A Pub Date : 2012-08-06 DOI: 10.1299/KIKAIA.78.1000

A. Hosoi, Keigo Takamura, N. Sato, H. Kawada

引用次数: 5

Influence of nut configuration on fatigue characteristics of bolt/nut assembly under transverse vibration 横向振动下螺母配置对螺栓/螺母组合疲劳特性的影响

Transactions of the Japan Society of Mechanical Engineers. A Pub Date : 2012-08-06 DOI: 10.1299/KIKAIA.78.1013

S. Hashimura, N. Yamada, H. Toda

引用次数: 0

Development of phase-field model for recrystallization based on conservation laws 基于守恒定律的再结晶相场模型的建立

Transactions of the Japan Society of Mechanical Engineers. A Pub Date : 2012-08-06 DOI: 10.1299/KIKAIA.78.1065

M. Muramatsu, K. Shizawa

{"title":"Development of phase-field model for recrystallization based on conservation laws","authors":"M. Muramatsu, K. Shizawa","doi":"10.1299/KIKAIA.78.1065","DOIUrl":"https://doi.org/10.1299/KIKAIA.78.1065","url":null,"abstract":"We modeled previously a crystal lattice as an elastic bar with equivalent atom mass. Applying such a lattice model to recrystallization phenomena, we developed conservation laws of mass, momentum, angular momentum and energy for mixture consisting of recrystallized phase and matrix. Also, the increase law of entropy for mixture was obtained. However, in the previous works, only general principles are formulated and material properties are not introduced into them. Moreover, it is still unclear which conservation laws are corresponding to the governing equations of phase-field models. In this paper, balance equations of mass for single phase and spin angular momentum are rewritten by use of order parameter and crystal orientation, respectively. Constitutive equations for fluxes of order parameter and crystal orientation are thermodynamically derived so that the entropy inequality is not violated. Substituting the constitutive equations of flux into the balance equations, basic equations are obtained. In these equations, the mass source term and diffusion coefficients are modeled so as to synchronize with the temporal change of grain boundary energy. Neglecting the conservative term of the equation of crystal orientation and then integrating it with respect to time, threedimensional KWC type phase-field equations are derived. Finally, reducing the obtained equations to two-dimensional ones, it is shown that the present equations result in the conventional KWC type phase-field model.","PeriodicalId":388675,"journal":{"name":"Transactions of the Japan Society of Mechanical Engineers. A","volume":"27 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-08-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116273277","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Nonlinear Elastic Finite Element Analysis of Ceramic Thermal Barrier Coatings 陶瓷热障涂层的非线性弹性有限元分析

Transactions of the Japan Society of Mechanical Engineers. A Pub Date : 2012-07-25 DOI: 10.1299/KIKAIA.78.829

M. Arai, T. Kumagai

引用次数: 0

Fatigue crack growth of aluminum alloy A6061-T6 in high pressure hydrogen gas and failure analysis on 35 MPa compressed hydrogen tanks VH3 for fuel cell vehicles A6061-T6铝合金在高压氢气中的疲劳裂纹扩展及燃料电池汽车用35mpa压缩氢气罐VH3的失效分析

Transactions of the Japan Society of Mechanical Engineers. A Pub Date : 2012-06-04 DOI: 10.1299/KIKAIA.78.442

H. Itoga, Shogo Watanabe, Y. Fukushima, S. Matsuoka, Y. Murakami

{"title":"Fatigue crack growth of aluminum alloy A6061-T6 in high pressure hydrogen gas and failure analysis on 35 MPa compressed hydrogen tanks VH3 for fuel cell vehicles","authors":"H. Itoga, Shogo Watanabe, Y. Fukushima, S. Matsuoka, Y. Murakami","doi":"10.1299/KIKAIA.78.442","DOIUrl":"https://doi.org/10.1299/KIKAIA.78.442","url":null,"abstract":"In order to ensure the safety of carbon fiber reinforced tanks for 35 and 70 MPa fuel cell vehicles, it is necessary to clarify the fatigue crack growth behavior of A6061-T6 aluminum alloy for the tank liner. In this study, the fatigue crack growth tests were carried out under the conditions of test frequencies f = 0.001-10 Hz in 90 MPa (≒70 MPa×125 %) hydrogen gas, 90 MPa nitrogen gas, air and deionized water at room temperature. The fatigue crack growth rates in hydrogen and nitrogen gas at f = 1-10 Hz were lower than those in air and deionized water. However, the fatigue crack growth rates in hydrogen and nitrogen gas at f = 0.001-0.1 Hz were nearly the same as those in air and deionized water. It was found from those results that the fatigue crack growth rate was not accelerated in 90 MPa hydrogen gas. The results of fatigue crack growth tests in this study were applied to the failure analysis of 35 MPa hydrogen tanks. In JARI (Japan Automotive Research Institute), using 35 MPa hydrogen tanks, the pressure cycling tests were conducted at -40, 25 and 85°C by water or PEPF (Perfluoroalkylpolyether) under 125 % filling pressure. The tanks fractured by LBB (Leak Before Break). Increasing in the test temperature increased in the number of cycles to LBB failure. Such a behavior was predicted by the fatigue crack growth properties of A6061-T6 obtained in this study.","PeriodicalId":388675,"journal":{"name":"Transactions of the Japan Society of Mechanical Engineers. A","volume":"65 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-06-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115898954","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 11

Development of simultaneous measurement system for strain and AE using FBG sensors (for structural health monitoring of solid rocket motor composite chambers) FBG应变声发射同步测量系统的研制(用于固体火箭发动机复合材料燃烧室结构健康监测)

Transactions of the Japan Society of Mechanical Engineers. A Pub Date : 2012-06-04 DOI: 10.1299/KIKAIA.78.728

T. Nakajima, E. Sato, H. Tsuda, A. Sato, N. Kawai

引用次数: 5

微視的クリープ損傷シミュレーションに基づく改良9Cr-1Mo鋼溶接継手のType IV損傷評価基于微观蠕形损伤模拟的改良9cr - 1mo钢焊接接头的Type IV损伤评估

Transactions of the Japan Society of Mechanical Engineers. A Pub Date : 2012-06-04 DOI: 10.1299/KIKAIA.78.623

拓也深堀, 巧時吉, 敏秀猪狩, 康晴中馬, 伸好駒井, 正昭藤田, 川島扶美子

引用次数: 6

Influence of carbon black on crack damage of sealing rubber material exposed to high-pressure hydrogen gas 炭黑对高压氢气作用下密封橡胶材料裂纹损伤的影响

Transactions of the Japan Society of Mechanical Engineers. A Pub Date : 2011-12-01 DOI: 10.1299/KIKAIA.77.323

Junichiro Yaiviabe, S. Nishimura

{"title":"Influence of carbon black on crack damage of sealing rubber material exposed to high-pressure hydrogen gas","authors":"Junichiro Yaiviabe, S. Nishimura","doi":"10.1299/KIKAIA.77.323","DOIUrl":"https://doi.org/10.1299/KIKAIA.77.323","url":null,"abstract":"Two carbon black-filled ethylene-propylene-diene-methylene linkage (EPDM) rubbers which have a different particle size were exposed to hydrogen gas; then, the critical pressures at the initiation of internal cracks (pF) were evaluated. It was obtained that pF = 4 - 5 MPa for two CB-filled rubbers by optical microscope observation. The pF values were estimated in terms of fracture mechanics under the assumption that bubbles were formed in the rubber structure after decompression, and these grew with the elapsed time; consequently, cracks initiated from the stress concentration of the bubbles. When an internal pressure of the bubble (Π) was assumed to be equal to the applied hydrogen pressure (p), the pF values were successfully estimated in terms of the critical internal pressure (ΠF), since ΠF showed good coincidence with pF for unfilled and silica-filled rubbers. In contrast, pF of the CB-filled rubbers was overestimated by this method, because ΠF was lager than pF. Since the CB-filled rubbers contain carbon black as filler, much hydrogen is absorbed in the rubbers compared with the unfilled and silica-filled rubbers. Because the increase of Π originated from the absorbed hydrogen by CB was underestimated, it was inferred that pF showed smaller than ΠF. Therefore, it was supposed that Π > p for the CB-filled rubbers, i.e., the CB-filled rubbers experienced more pressurization due to additional hydrogen.","PeriodicalId":388675,"journal":{"name":"Transactions of the Japan Society of Mechanical Engineers. A","volume":"129 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126801739","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1