Transactions of the Japan Society of Mechanical Engineers. A最新文献_第4页

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

Formulation of balance laws as mixture theory for nuclei and matrix in recrystallization 再结晶过程中核与基体混合理论平衡规律的表述

Transactions of the Japan Society of Mechanical Engineers. A Pub Date : 2012-06-04 DOI: 10.1299/KIKAIA.78.742

M. Muramatsu, Y. Aoyagi, K. Shizawa

{"title":"Formulation of balance laws as mixture theory for nuclei and matrix in recrystallization","authors":"M. Muramatsu, Y. Aoyagi, K. Shizawa","doi":"10.1299/KIKAIA.78.742","DOIUrl":"https://doi.org/10.1299/KIKAIA.78.742","url":null,"abstract":"In the previous work, the authors formulated the balance laws of mass, momentum, angular momentum and energy of the lattice element used for recrystallization. These laws were summed up over a phase in a representative volume element (RVE) and averaged in the RVE so as to develop the discrete balance laws for single phase. Furthermore, the balance law of angular momentum was separated into a bulk and a lattice parts through the orderestimation with the representative lengths both in macroscopic and microscopic scales. In this paper, the RVE converges on a material point so that the laws are rewritten in the integration form. When the laws are summed up all over the phases and averaged in them, the balance laws of mass, momentum, angular momentum and energy for nuclei and matrix as mixture are formulated, using an useful theorem proposed for the mixing summation of unsteady terms. At this time, the macroscopic part of the balance law for angular momentum results in the usual equation of angular momentum, so that the stress tensor keeps symmetry even if the lattice rotation is considered. While, the microscopic one is localized as an equation of spin angular momentum for lattice, which is suggested to be equivalent to the evolution equation of crystal orientation in KWC type phase-field model. Moreover, the increase law of entropy for mixture is also formulated. During this process, the entropy flux is defined by use of relative mass flux and chemical potential of phase transformation.","PeriodicalId":388675,"journal":{"name":"Transactions of the Japan Society of Mechanical Engineers. A","volume":"268 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":"115274520","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

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

Effect of contact conditions on growth of small crack in fretting fatigue 接触条件对微动疲劳小裂纹扩展的影响

Transactions of the Japan Society of Mechanical Engineers. A Pub Date : 2012-04-16 DOI: 10.1299/KIKAIA.78.1

Shunsuke Kataoka, H. Ono, M. Kubota, Y. Kondo

{"title":"Effect of contact conditions on growth of small crack in fretting fatigue","authors":"Shunsuke Kataoka, H. Ono, M. Kubota, Y. Kondo","doi":"10.1299/KIKAIA.78.1","DOIUrl":"https://doi.org/10.1299/KIKAIA.78.1","url":null,"abstract":"As the general features of fretting fatigue, initiation of fretting fatigue crack is in the very early stage of the fretting fatigue life and there are small non-propagating cracks in the test specimen that doesn't fracture at the fretting fatigue limit. In accordance with these experimental facts, fretting fatigue problem can be considered as a propagation problem of small crack. Thus, a pre-cracked specimen was used in the fretting fatigue test in this study. The objective was to consider the determinant factors of fretting fatigue strength. In the fretting fatigue test, the fretting fatigue limit of the pre-cracked specimen was once reduced and after increased with increase of the contact pressure. The reason was understood by the stress intensity factor of the pre-crack obtained by a finite element analysis. In this study, the fretting fatigue limit can be predicted by the comparison of ΔK of the pre-crack and the propagation threshold of the pre-crack ΔKth. The effect of the relative location of the pre-crack to the contact edge on the fretting fatigue strength was also discussed by both fretting fatigue test and FEM analysis.","PeriodicalId":388675,"journal":{"name":"Transactions of the Japan Society of Mechanical Engineers. A","volume":"32 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-04-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132641024","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

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

Formulation of discrete balance laws of single phase in lattice scale for recrystallization 晶格尺度下单相重结晶离散平衡规律的表述

Transactions of the Japan Society of Mechanical Engineers. A Pub Date : 2011-12-01 DOI: 10.1299/KIKAIA.77.1304

M. Muramatsu, Y. Aoyagi, K. Shizawa

{"title":"Formulation of discrete balance laws of single phase in lattice scale for recrystallization","authors":"M. Muramatsu, Y. Aoyagi, K. Shizawa","doi":"10.1299/KIKAIA.77.1304","DOIUrl":"https://doi.org/10.1299/KIKAIA.77.1304","url":null,"abstract":"A crystal lattice in a metal during recrystallization process is modeled as an elastic bar element subject only to stretch and its kinematics is discussed. The balance laws of mass, momentum, angular momentum and energy of the lattice element are formulated. These laws are summed up over a phase in a representative volume element (RVE) and averaged in the RVE so as to prepare to develop macroscopic balance laws for a continuum mixture consisting of several phases. When the RVE converges on a material point at the final procedure of formulation, the present model can be regarded as a director model whose direction vector expressing the crystal orientation is attached to a material point of simple body. During the averaging process, two useful theorems are proposed for averaging terms associated with mass source and then these theorems are verified. Moreover, defining the representative lengths both in macroscopic and microscopic scales and performing an order-estimation for the balance law of angular momentum, this law can be separated into the bulk and lattice parts. The former results in the usual form, so that the Cauchy stress keeps symmetric even though the spin angular momentum of crystal lattice is taken into account. On the other hand, the latter corresponds to the evolution equation of crystal orientation of KWC type phase-field model.","PeriodicalId":388675,"journal":{"name":"Transactions of the Japan Society of Mechanical Engineers. A","volume":"22 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":"116478417","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