首页 > 最新文献

JSME international journal. Series A, mechanics and material engineering最新文献

英文 中文
Domain Optimization Analysis in Linear Elastic Problems : Approach Using Traction Method 线性弹性问题的域优化分析:牵引法的方法
Pub Date : 1996-04-15 DOI: 10.1299/JSMEA1993.39.2_272
H. Azegami, Z. Wu
We present a numerical analysis and results using the traction method for optimizing domains in terms of which linear elastic problems are defined. In this paper we consider the application of the traction method, which was proposed as a solution to domain optimization problems in elliptic boundary value problems. The minimization of the mean compliance is considered. Using the Lagrange multiplier method, we obtain the shape gradient functions for these domain optimization problems from the optimality criteria. In this process we consider variations in the surface force acting on the boundary and variations in the stiffness function and the body force distributed in the domain. We obtain solutions for an infinite plate with a hole and a rectangular plate clamped at both ends.
本文给出了用牵引法求解线性弹性问题的最优化域的数值分析和结果。本文考虑了牵引法在椭圆边值问题中求解区域优化问题的应用。考虑了平均柔度的最小化问题。利用拉格朗日乘子法,从最优性准则出发,得到了这些区域优化问题的形状梯度函数。在此过程中,我们考虑了作用在边界上的表面力的变化,以及分布在区域内的刚度函数和体力的变化。我们得到了带孔洞的无限大板和两端夹紧矩形板的解。
{"title":"Domain Optimization Analysis in Linear Elastic Problems : Approach Using Traction Method","authors":"H. Azegami, Z. Wu","doi":"10.1299/JSMEA1993.39.2_272","DOIUrl":"https://doi.org/10.1299/JSMEA1993.39.2_272","url":null,"abstract":"We present a numerical analysis and results using the traction method for optimizing domains in terms of which linear elastic problems are defined. In this paper we consider the application of the traction method, which was proposed as a solution to domain optimization problems in elliptic boundary value problems. The minimization of the mean compliance is considered. Using the Lagrange multiplier method, we obtain the shape gradient functions for these domain optimization problems from the optimality criteria. In this process we consider variations in the surface force acting on the boundary and variations in the stiffness function and the body force distributed in the domain. We obtain solutions for an infinite plate with a hole and a rectangular plate clamped at both ends.","PeriodicalId":143127,"journal":{"name":"JSME international journal. Series A, mechanics and material engineering","volume":"650 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1996-04-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116481630","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: 91
Propagation mechanism of ultrasonic waves in porous ceramics 超声波在多孔陶瓷中的传播机理
Pub Date : 1996-04-15 DOI: 10.1299/JSMEA1993.39.2_266
J. Takatsubo, Shigeyuki Yamamoto
In this paper, we present a probabilistic theory of propagation of ultrasonic waves in porous ceramics, and propose a new method of ultrasonic inspection for nondestructive pore characterization. The idea is based upon the arrival probability of ultrasonic rays. When incident rays impinge on a pore, they travel around the pore surface and increase the propagation time. We studied this process probabilistically, and found that the propagated waveforms can be expressed as Gaussian functions. The Gaussian waveform is determined by the porosity, pore size and pore shape. This new finding led to the following important laws. (1) The delay time of an ultrasonic wave passing through porous ceramics is proportional to the porosity. (2) The pulse width of the wave increases with increasing mean pore size. (3) The amplitude of the wave decreases with mean pore size. (4) The delay time and pulse width of the wave increase as the mean pore perimeter increases. Formulae for these relationships between ultrasonic and pore characteristics were derived, and an ultrasonic method for evaluating porosity and pore size was proposed.
本文提出了超声波在多孔陶瓷中传播的概率理论,并提出了一种用于无损孔表征的超声检测新方法。这个想法是基于超声波到达的概率。当入射光线照射在孔隙上时,它们会绕孔隙表面传播,从而增加了传播时间。我们对这一过程进行了概率研究,发现传播波形可以用高斯函数表示。高斯波形由孔隙度、孔隙大小和孔隙形状决定。这一新发现引出了以下重要定律。(1)超声波通过多孔陶瓷的延时时间与孔隙率成正比。(2)波脉宽随平均孔径增大而增大。(3)波浪振幅随平均孔径的增大而减小。(4)波的延迟时间和脉宽随着平均孔隙周长的增大而增大。推导了超声与孔隙特征之间的关系式,并提出了一种评价孔隙度和孔径的超声方法。
{"title":"Propagation mechanism of ultrasonic waves in porous ceramics","authors":"J. Takatsubo, Shigeyuki Yamamoto","doi":"10.1299/JSMEA1993.39.2_266","DOIUrl":"https://doi.org/10.1299/JSMEA1993.39.2_266","url":null,"abstract":"In this paper, we present a probabilistic theory of propagation of ultrasonic waves in porous ceramics, and propose a new method of ultrasonic inspection for nondestructive pore characterization. The idea is based upon the arrival probability of ultrasonic rays. When incident rays impinge on a pore, they travel around the pore surface and increase the propagation time. We studied this process probabilistically, and found that the propagated waveforms can be expressed as Gaussian functions. The Gaussian waveform is determined by the porosity, pore size and pore shape. This new finding led to the following important laws. (1) The delay time of an ultrasonic wave passing through porous ceramics is proportional to the porosity. (2) The pulse width of the wave increases with increasing mean pore size. (3) The amplitude of the wave decreases with mean pore size. (4) The delay time and pulse width of the wave increase as the mean pore perimeter increases. Formulae for these relationships between ultrasonic and pore characteristics were derived, and an ultrasonic method for evaluating porosity and pore size was proposed.","PeriodicalId":143127,"journal":{"name":"JSME international journal. Series A, mechanics and material engineering","volume":"23 3","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1996-04-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131521103","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: 6
2D mesh generation scheme for adaptive remeshing process in finite element method 有限元法自适应重划分过程的二维网格生成方案
Pub Date : 1996-04-15 DOI: 10.1299/JSMEA1993.39.2_204
A. Tezuka
The discretization of a whole domain is a prerequisite process for Finite Element Method (FEM). Since manual mesh generation is tedious, mesh generation schemes have been studied in recent years. In iterative analyses, the geometry of the domain is drastically changed by each iteration. It is known that mesh regeneration eliminates mesh distortion caused by the geometry change, which greatly affects the convergence of the whole analysis. If error control in the analysis is additionally considered in the mesh regeneration, such a process should be adaptive ; adaptive remeshing is required for a reliable solution. There are many mesh generators available, however, most of them require interaction with the user, and thus cannot be used for adaptive remeshing. In this paper, a sophisticated mesh generation scheme for the adaptive remeshing in the 2D FEM is discussed in detail. After comparison with other schemes, it is concluded that our scheme is superior to the others in terms of flexibility and time complexity.
整个区域的离散化是有限元方法的前提。由于手工网格生成过程繁琐,近年来人们对网格生成方案进行了研究。在迭代分析中,每次迭代都会极大地改变域的几何形状。已知网格再生消除了几何变化引起的网格畸变,这极大地影响了整个分析的收敛性。如果在网格再生中额外考虑分析中的误差控制,则该过程应是自适应的;可靠的解决方案需要自适应网格划分。有许多可用的网格生成器,然而,它们中的大多数需要与用户交互,因此不能用于自适应网格划分。本文详细讨论了一种用于二维有限元自适应网格划分的复杂网格生成方案。通过与其他方案的比较,我们的方案在灵活性和时间复杂度方面都优于其他方案。
{"title":"2D mesh generation scheme for adaptive remeshing process in finite element method","authors":"A. Tezuka","doi":"10.1299/JSMEA1993.39.2_204","DOIUrl":"https://doi.org/10.1299/JSMEA1993.39.2_204","url":null,"abstract":"The discretization of a whole domain is a prerequisite process for Finite Element Method (FEM). Since manual mesh generation is tedious, mesh generation schemes have been studied in recent years. In iterative analyses, the geometry of the domain is drastically changed by each iteration. It is known that mesh regeneration eliminates mesh distortion caused by the geometry change, which greatly affects the convergence of the whole analysis. If error control in the analysis is additionally considered in the mesh regeneration, such a process should be adaptive ; adaptive remeshing is required for a reliable solution. There are many mesh generators available, however, most of them require interaction with the user, and thus cannot be used for adaptive remeshing. In this paper, a sophisticated mesh generation scheme for the adaptive remeshing in the 2D FEM is discussed in detail. After comparison with other schemes, it is concluded that our scheme is superior to the others in terms of flexibility and time complexity.","PeriodicalId":143127,"journal":{"name":"JSME international journal. Series A, mechanics and material engineering","volume":"32 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1996-04-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125376332","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: 5
Three-Dimensional Numerical Analysis of Dynamic Thermo-Elastic/Viscoplastic Problem by the Method of Characteristics 动态热弹/粘塑性问题的三维特征数值分析
Pub Date : 1996-04-15 DOI: 10.1299/JSMEA1993.39.2_216
Kaishin LlU, K. Mimura, S. Tanimura
This paper is concerned with a numerical technique based on the method of characteristics for three-dimensional dynamic thermo-elastic/viscoplastic problems. A constitutive model covering a wide range of strain rates and a wide range of temperatures, proposed by Tanimura, is used. As a numerical example, the three-dimensional stress wave propagation in a thermo-elastic/viscoplastic bar of square cross section subjected to both an impact loading and a thermal shock is presented. The stability and convergence of these numerical solutions are examined by checking the error in the total energy of the system.
本文研究了基于特征值法的三维动态热弹/粘塑性问题的数值计算方法。一个本构模型涵盖了大范围的应变率和大范围的温度,由谷村提出,是使用。作为数值算例,给出了在冲击载荷和热冲击作用下,方形截面热弹/粘塑性杆中的三维应力波传播。通过对系统总能量误差的检验,验证了这些数值解的稳定性和收敛性。
{"title":"Three-Dimensional Numerical Analysis of Dynamic Thermo-Elastic/Viscoplastic Problem by the Method of Characteristics","authors":"Kaishin LlU, K. Mimura, S. Tanimura","doi":"10.1299/JSMEA1993.39.2_216","DOIUrl":"https://doi.org/10.1299/JSMEA1993.39.2_216","url":null,"abstract":"This paper is concerned with a numerical technique based on the method of characteristics for three-dimensional dynamic thermo-elastic/viscoplastic problems. A constitutive model covering a wide range of strain rates and a wide range of temperatures, proposed by Tanimura, is used. As a numerical example, the three-dimensional stress wave propagation in a thermo-elastic/viscoplastic bar of square cross section subjected to both an impact loading and a thermal shock is presented. The stability and convergence of these numerical solutions are examined by checking the error in the total energy of the system.","PeriodicalId":143127,"journal":{"name":"JSME international journal. Series A, mechanics and material engineering","volume":"176 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1996-04-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131720687","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: 3
Tension of Elastic Solid with Elastic Circular-Cylindrical Inclusion 含弹性圆圆柱夹杂的弹性固体的张力
Pub Date : 1996-04-15 DOI: 10.1299/JSMEA1993.39.2_186
H. Hasegawa, Kohichi Yoshiie
We discuss the stress concentration problem of an elastic solid with an elastic circular-cylindrical inclusion under tension. A method of solution is developed for the above problem using fundamental solutions of axisymmetric problems of elasticity. The fundamental solutions are defined as solutions for the problem of an elastic solid subjected to axisymmetric body forces acting along a circle. Through numerical calculations, the influence of the length of the elastic circular-cylindrical inclusion on the stress distribution around the inclusion and on the central section is investigated. The influence of the share modulus of elasticity on the stress distribution is also shown.
讨论了具有弹性圆圆柱夹杂的弹性固体在张力作用下的应力集中问题。利用轴对称弹性问题的基本解,提出了上述问题的一种求解方法。基本解被定义为弹性固体受到沿圆周作用的轴对称体力的问题的解。通过数值计算,研究了弹性圆圆柱夹杂物长度对夹杂物周围和中心截面应力分布的影响。文中还分析了份额弹性模量对应力分布的影响。
{"title":"Tension of Elastic Solid with Elastic Circular-Cylindrical Inclusion","authors":"H. Hasegawa, Kohichi Yoshiie","doi":"10.1299/JSMEA1993.39.2_186","DOIUrl":"https://doi.org/10.1299/JSMEA1993.39.2_186","url":null,"abstract":"We discuss the stress concentration problem of an elastic solid with an elastic circular-cylindrical inclusion under tension. A method of solution is developed for the above problem using fundamental solutions of axisymmetric problems of elasticity. The fundamental solutions are defined as solutions for the problem of an elastic solid subjected to axisymmetric body forces acting along a circle. Through numerical calculations, the influence of the length of the elastic circular-cylindrical inclusion on the stress distribution around the inclusion and on the central section is investigated. The influence of the share modulus of elasticity on the stress distribution is also shown.","PeriodicalId":143127,"journal":{"name":"JSME international journal. Series A, mechanics and material engineering","volume":"26 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1996-04-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131608655","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: 2
Cross Effect in Aluminium Tubes Subjected to Torsion and Tension 扭拉作用下铝管的交叉效应
Pub Date : 1996-01-15 DOI: 10.1299/JSMEA1993.39.1_124
H. Takahashi, Hiroyuki Nagaoka, M. Matsunaga, Isao Shiono
The flow stress in tension after torsional prestrain, for example, is higher than that in pure tensional loading. This phenomenon is called cross effect, cross hardening or latent hardening. In the present study, the cross effect is investigated with torsion-tension combined loading tests. It is observed that the cross effect as well as Bauschinger effect is a kind of delayed phenomenon due to a change of the loading direction. We propose a model that unconstrained Orowan loops around pile-ups that were produced during preloading work as forest dislocations against moving dislocations on intersecting slip planes during subsequent loadings. Since the density of forest dislocations determines the flow stress, the free Orowan loops cause the cross effect during cross loading as well as the Bauschinger effect during reverse loading. The above explanation for the cross effect is confirmed by tension tests after forward and reverse torsional prestrains.
例如,扭转预应变后的拉伸状态下的流动应力要高于纯拉伸加载。这种现象称为交叉效应、交叉硬化或潜在硬化。在本研究中,通过扭拉联合加载试验研究了交叉效应。观察到交叉效应和包辛格效应是一种由于加载方向改变而产生的延迟现象。我们提出了一个模型,在预加载工作期间产生的堆积周围的无约束Orowan环作为森林错位与随后加载期间相交滑动面上的移动错位。由于森林位错的密度决定了流动应力,自由的Orowan环在交叉加载时产生交叉效应,在反向加载时产生包辛格效应。通过正扭预应变和反扭预应变后的拉伸试验,证实了上述交叉效应的解释。
{"title":"Cross Effect in Aluminium Tubes Subjected to Torsion and Tension","authors":"H. Takahashi, Hiroyuki Nagaoka, M. Matsunaga, Isao Shiono","doi":"10.1299/JSMEA1993.39.1_124","DOIUrl":"https://doi.org/10.1299/JSMEA1993.39.1_124","url":null,"abstract":"The flow stress in tension after torsional prestrain, for example, is higher than that in pure tensional loading. This phenomenon is called cross effect, cross hardening or latent hardening. In the present study, the cross effect is investigated with torsion-tension combined loading tests. It is observed that the cross effect as well as Bauschinger effect is a kind of delayed phenomenon due to a change of the loading direction. We propose a model that unconstrained Orowan loops around pile-ups that were produced during preloading work as forest dislocations against moving dislocations on intersecting slip planes during subsequent loadings. Since the density of forest dislocations determines the flow stress, the free Orowan loops cause the cross effect during cross loading as well as the Bauschinger effect during reverse loading. The above explanation for the cross effect is confirmed by tension tests after forward and reverse torsional prestrains.","PeriodicalId":143127,"journal":{"name":"JSME international journal. Series A, mechanics and material engineering","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1996-01-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124531292","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
Effect of Flaws in Coating Film on Fatigue Strength of Steel Coated with Titanium Nitride 涂层缺陷对氮化钛涂层钢疲劳强度的影响
Pub Date : 1996-01-15 DOI: 10.1299/JSMEA1993.39.1_142
K. Shiozawa, Toshinobu Tomosaka, Ling Han, Kou Motobayashi
To clarify the effect of flaws in the coating film on fatigue strength, cantilever-type rotating-bending fatigue tests were conducted in air and in saline solution (3.0% NaCl) using specimens of 0.37%C steel with flaws in the coating of titanium nitride (TiN)thin film coated by PVD and CVD methods. Flaws in the coating film on the specimen surface were introduced by the application of 1.1-1.6% static tensile strain before the test. An obvious decrease in fatigue life of the specimen with flawed coating film was observed in both environments, as compared with that of an uncoated specimen and a specimen with unflawed coating film. This behavior was marked for fatigue in air, that is, the decrease of fatigue life was 90-75% in air as opposed to 70-50% in saline solution. Although film thickness was 3-5 μm, the flaw in the film had the same effect as a notch at which cracks initiate on the substrate. Many cracks were induced in the substrate directly under a flaw and coalesced into a large crack at an early stage of fatigue in air. In corrosion fatigue, corrosion pits at which cracks initiate occur on the substrate under a flaw at an early stage of the fatigue process, and the incubation period prior to the formation of pits does not occur.
为研究涂层缺陷对疲劳强度的影响,采用PVD和CVD两种方法对涂层中有缺陷的0.37%C钢试样进行了空气和盐水(3.0% NaCl)中悬臂式旋转弯曲疲劳试验。试验前施加1.1-1.6%的静拉伸应变,导致试样表面涂层出现缺陷。涂层有缺陷的试样在两种环境下的疲劳寿命都明显低于未涂层和涂层无缺陷的试样。这种行为在空气中的疲劳中表现得很明显,即空气中的疲劳寿命降低了90-75%,而盐水溶液中的疲劳寿命降低了70-50%。虽然薄膜厚度为3 ~ 5 μm,但薄膜上的缺陷与在衬底上产生裂纹的缺口具有相同的作用。在空气疲劳的早期阶段,裂纹直接在基体下产生许多裂纹并合并成一个大裂纹。在腐蚀疲劳中,在疲劳过程的早期阶段,在缺陷下的基体上产生裂纹的腐蚀坑,而在形成坑之前的潜伏期不发生。
{"title":"Effect of Flaws in Coating Film on Fatigue Strength of Steel Coated with Titanium Nitride","authors":"K. Shiozawa, Toshinobu Tomosaka, Ling Han, Kou Motobayashi","doi":"10.1299/JSMEA1993.39.1_142","DOIUrl":"https://doi.org/10.1299/JSMEA1993.39.1_142","url":null,"abstract":"To clarify the effect of flaws in the coating film on fatigue strength, cantilever-type rotating-bending fatigue tests were conducted in air and in saline solution (3.0% NaCl) using specimens of 0.37%C steel with flaws in the coating of titanium nitride (TiN)thin film coated by PVD and CVD methods. Flaws in the coating film on the specimen surface were introduced by the application of 1.1-1.6% static tensile strain before the test. An obvious decrease in fatigue life of the specimen with flawed coating film was observed in both environments, as compared with that of an uncoated specimen and a specimen with unflawed coating film. This behavior was marked for fatigue in air, that is, the decrease of fatigue life was 90-75% in air as opposed to 70-50% in saline solution. Although film thickness was 3-5 μm, the flaw in the film had the same effect as a notch at which cracks initiate on the substrate. Many cracks were induced in the substrate directly under a flaw and coalesced into a large crack at an early stage of fatigue in air. In corrosion fatigue, corrosion pits at which cracks initiate occur on the substrate under a flaw at an early stage of the fatigue process, and the incubation period prior to the formation of pits does not occur.","PeriodicalId":143127,"journal":{"name":"JSME international journal. Series A, mechanics and material engineering","volume":"93 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1996-01-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115871507","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: 6
Study of Fatigue Crack Propagation Behavior of Film Materials : Fatigue Testing Method and Factors Controlling Fatigue Crack Propagation Rates 薄膜材料疲劳裂纹扩展行为研究:疲劳试验方法及控制疲劳裂纹扩展速率的因素
Pub Date : 1996-01-15 DOI: 10.1299/JSMEA1993.39.1_34
T. Torii, K. Honda, Akira Matsuba, Mutsumi Tanida
At present, materials with small dimensions such as thin films are often used in electronic packaging. This study concerns a film fatigue testing method, which makes it possible to observe the fatigue crack propagation behavior on a film bonded to a through-hole in a base plate subjected to push-pull cyclic loads. An analytical model for this testing method is presented using a boundary element method, so that the film fatigue fracture can be treated quantitatively in terms of fracture mechanics (K-values and J-integrals). The fatigue crack growth properties were examined for commercial-grade iron films with 100 μm thickness bonded to either a circular or an elliptical hole in the base plate. As a result, using the stress intensity factor based on the measured crack opening displacement, ΔK est , the fatigue crack propagation behavior of the film could be understood in terms of the effective stress intensity factor widely used in the bulk specimen, ΔK eff .
目前,电子封装多采用薄膜等尺寸较小的材料。本文研究了一种膜疲劳试验方法,该方法可以观察基板上连接通孔的膜在推拉循环载荷作用下的疲劳裂纹扩展行为。采用边界元法建立了该试验方法的解析模型,从而可以从断裂力学(k值和j积分)的角度对膜疲劳断裂进行定量处理。研究了100 μm厚的商品级铁薄膜与基板上的圆形孔或椭圆孔结合的疲劳裂纹扩展性能。因此,利用基于实测裂纹张开位移的应力强度因子ΔK est,可以用广泛应用于体试样的有效应力强度因子ΔK eff来理解薄膜的疲劳裂纹扩展行为。
{"title":"Study of Fatigue Crack Propagation Behavior of Film Materials : Fatigue Testing Method and Factors Controlling Fatigue Crack Propagation Rates","authors":"T. Torii, K. Honda, Akira Matsuba, Mutsumi Tanida","doi":"10.1299/JSMEA1993.39.1_34","DOIUrl":"https://doi.org/10.1299/JSMEA1993.39.1_34","url":null,"abstract":"At present, materials with small dimensions such as thin films are often used in electronic packaging. This study concerns a film fatigue testing method, which makes it possible to observe the fatigue crack propagation behavior on a film bonded to a through-hole in a base plate subjected to push-pull cyclic loads. An analytical model for this testing method is presented using a boundary element method, so that the film fatigue fracture can be treated quantitatively in terms of fracture mechanics (K-values and J-integrals). The fatigue crack growth properties were examined for commercial-grade iron films with 100 μm thickness bonded to either a circular or an elliptical hole in the base plate. As a result, using the stress intensity factor based on the measured crack opening displacement, ΔK est , the fatigue crack propagation behavior of the film could be understood in terms of the effective stress intensity factor widely used in the bulk specimen, ΔK eff .","PeriodicalId":143127,"journal":{"name":"JSME international journal. Series A, mechanics and material engineering","volume":"30 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1996-01-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115655476","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: 3
Generation method of distributed data for FEM analysis 有限元分析分布式数据的生成方法
Pub Date : 1996-01-15 DOI: 10.1299/JSMEA1993.39.1_93
Y. Ochiai
Many automatic mesh generation methods for the finite element method (FEM) have been reported. However, for the case of complicated heat generation, a large number of data depending on the position must be added to the mesh data. Other examples, which also need a large number of data depending on the position, are functionally gradient material and biomechanics. In these cases, it is difficult to prepare the distributed data. This paper shows that these problems can be solved by using an improved multiple-reciprocity boundary element method. In this method, contour lines of distribution are used and these distributions are assumed to satisfy the Poisson equation approximately.
目前已有许多有限元法的自动网格生成方法。然而,对于复杂的产热情况,必须在网格数据中添加大量依赖于位置的数据。其他的例子,也需要大量的数据取决于位置,是功能梯度材料和生物力学。在这些情况下,很难准备分布式数据。本文表明,这些问题可以用改进的多重互易边界元法求解。该方法采用分布的等高线,并假定这些分布近似满足泊松方程。
{"title":"Generation method of distributed data for FEM analysis","authors":"Y. Ochiai","doi":"10.1299/JSMEA1993.39.1_93","DOIUrl":"https://doi.org/10.1299/JSMEA1993.39.1_93","url":null,"abstract":"Many automatic mesh generation methods for the finite element method (FEM) have been reported. However, for the case of complicated heat generation, a large number of data depending on the position must be added to the mesh data. Other examples, which also need a large number of data depending on the position, are functionally gradient material and biomechanics. In these cases, it is difficult to prepare the distributed data. This paper shows that these problems can be solved by using an improved multiple-reciprocity boundary element method. In this method, contour lines of distribution are used and these distributions are assumed to satisfy the Poisson equation approximately.","PeriodicalId":143127,"journal":{"name":"JSME international journal. Series A, mechanics and material engineering","volume":"107 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1996-01-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121127812","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
Mutual Interference of Two Surface Cracks in a Semi-Infinite Body Due to Rolling Contact with Frictional Heating by a Rigid Roller 半无限体中两表面裂纹与刚性滚子摩擦加热滚动接触的相互干涉
Pub Date : 1996-01-15 DOI: 10.1299/JSMEA1993.39.1_26
T. Goshima, Y. Kamishima
This paper deals with the two-dimensional thermoelastic contact problem of a rolling rigid cylinder of specified shape, which induces effects of friction and heat generation in the contact region, moving with constant velocity in an elastic half-space containing two surface cracks located close to each other. In the present temperature analysis, the speed of the moving heat source is assumed to be much greater than the ratio of the thermal diffusivity to the contact length. The problem is solved using complex-variable techniques and is reduced to a pair of singular integral equations which are solved numerically. Numerical results of stress intensity factors are obtained for the case of two parallel cracks. The variance in interference effects on the stress intensity factors with distance between two cracks, and the effects of the frictional coefficient, the sliding/rolling ratio and the distribution of heat generation on the results are considered.
本文研究了给定形状的滚动刚性圆柱的二维热弹性接触问题,该问题在包含两个相邻表面裂纹的弹性半空间中以等速运动,在接触区域产生摩擦和热的影响。在目前的温度分析中,假定移动热源的速度远大于热扩散率与接触长度之比。该问题采用复变技术求解,并简化为一对奇异积分方程,用数值方法求解。给出了平行裂纹情况下应力强度因子的数值计算结果。考虑了干涉对应力强度因子的影响随裂纹间距的变化,以及摩擦系数、滑动/滚动比和产热分布对结果的影响。
{"title":"Mutual Interference of Two Surface Cracks in a Semi-Infinite Body Due to Rolling Contact with Frictional Heating by a Rigid Roller","authors":"T. Goshima, Y. Kamishima","doi":"10.1299/JSMEA1993.39.1_26","DOIUrl":"https://doi.org/10.1299/JSMEA1993.39.1_26","url":null,"abstract":"This paper deals with the two-dimensional thermoelastic contact problem of a rolling rigid cylinder of specified shape, which induces effects of friction and heat generation in the contact region, moving with constant velocity in an elastic half-space containing two surface cracks located close to each other. In the present temperature analysis, the speed of the moving heat source is assumed to be much greater than the ratio of the thermal diffusivity to the contact length. The problem is solved using complex-variable techniques and is reduced to a pair of singular integral equations which are solved numerically. Numerical results of stress intensity factors are obtained for the case of two parallel cracks. The variance in interference effects on the stress intensity factors with distance between two cracks, and the effects of the frictional coefficient, the sliding/rolling ratio and the distribution of heat generation on the results are considered.","PeriodicalId":143127,"journal":{"name":"JSME international journal. Series A, mechanics and material engineering","volume":"63 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1996-01-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131249877","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: 9
期刊
JSME international journal. Series A, mechanics and material engineering
全部 Acc. Chem. Res. ACS Applied Bio Materials ACS Appl. Electron. Mater. ACS Appl. Energy Mater. ACS Appl. Mater. Interfaces ACS Appl. Nano Mater. ACS Appl. Polym. Mater. ACS BIOMATER-SCI ENG ACS Catal. ACS Cent. Sci. ACS Chem. Biol. ACS Chemical Health & Safety ACS Chem. Neurosci. ACS Comb. Sci. ACS Earth Space Chem. ACS Energy Lett. ACS Infect. Dis. ACS Macro Lett. ACS Mater. Lett. ACS Med. Chem. Lett. ACS Nano ACS Omega ACS Photonics ACS Sens. ACS Sustainable Chem. Eng. ACS Synth. Biol. Anal. Chem. BIOCHEMISTRY-US Bioconjugate Chem. BIOMACROMOLECULES Chem. Res. Toxicol. Chem. Rev. Chem. Mater. CRYST GROWTH DES ENERG FUEL Environ. Sci. Technol. Environ. Sci. Technol. Lett. Eur. J. Inorg. Chem. IND ENG CHEM RES Inorg. Chem. J. Agric. Food. Chem. J. Chem. Eng. Data J. Chem. Educ. J. Chem. Inf. Model. J. Chem. Theory Comput. J. Med. Chem. J. Nat. Prod. J PROTEOME RES J. Am. Chem. Soc. LANGMUIR MACROMOLECULES Mol. Pharmaceutics Nano Lett. Org. Lett. ORG PROCESS RES DEV ORGANOMETALLICS J. Org. Chem. J. Phys. Chem. J. Phys. Chem. A J. Phys. Chem. B J. Phys. Chem. C J. Phys. Chem. Lett. Analyst Anal. Methods Biomater. Sci. Catal. Sci. Technol. Chem. Commun. Chem. Soc. Rev. CHEM EDUC RES PRACT CRYSTENGCOMM Dalton Trans. Energy Environ. Sci. ENVIRON SCI-NANO ENVIRON SCI-PROC IMP ENVIRON SCI-WAT RES Faraday Discuss. Food Funct. Green Chem. Inorg. Chem. Front. Integr. Biol. J. Anal. At. Spectrom. J. Mater. Chem. A J. Mater. Chem. B J. Mater. Chem. C Lab Chip Mater. Chem. Front. Mater. Horiz. MEDCHEMCOMM Metallomics Mol. Biosyst. Mol. Syst. Des. Eng. Nanoscale Nanoscale Horiz. Nat. Prod. Rep. New J. Chem. Org. Biomol. Chem. Org. Chem. Front. PHOTOCH PHOTOBIO SCI PCCP Polym. Chem.
×
引用
GB/T 7714-2015
复制
MLA
复制
APA
复制
导出至
BibTeX EndNote RefMan NoteFirst NoteExpress
×
0
微信
客服QQ
Book学术公众号 扫码关注我们
反馈
×
意见反馈
请填写您的意见或建议
请填写您的手机或邮箱
×
提示
您的信息不完整,为了账户安全,请先补充。
现在去补充
×
提示
您因"违规操作"
具体请查看互助需知
我知道了
×
提示
现在去查看 取消
×
提示
确定
Book学术官方微信
Book学术文献互助
Book学术文献互助群
群 号:481959085
Book学术
文献互助 智能选刊 最新文献 互助须知 联系我们:info@booksci.cn
Book学术提供免费学术资源搜索服务,方便国内外学者检索中英文文献。致力于提供最便捷和优质的服务体验。
Copyright © 2023 Book学术 All rights reserved.
ghs 京公网安备 11010802042870号 京ICP备2023020795号-1