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

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Evaluation of Function of Spot-Welded Joint Using Ultrasonic Inspection : Nondestructive Evaluation on Tension Shearing Strength with Neural Network 点焊接头的超声检测功能评价:基于神经网络的抗拉抗剪强度无损评价
JSME international journal. Series A, mechanics and material engineering Pub Date : 1996-10-15 DOI: 10.1299/JSMEA1993.39.4_626
M. Takuma, N. Shinke, H. Motono
{"title":"Evaluation of Function of Spot-Welded Joint Using Ultrasonic Inspection : Nondestructive Evaluation on Tension Shearing Strength with Neural Network","authors":"M. Takuma, N. Shinke, H. Motono","doi":"10.1299/JSMEA1993.39.4_626","DOIUrl":"https://doi.org/10.1299/JSMEA1993.39.4_626","url":null,"abstract":"The spot welded joint is widely used as a structural part. In the quality control of the joint, one of the most important issues is to quantitatively estimate connective strength such as tension shearing load from the information detected by nondestructive testing as accurately as possible. In this paper, a system based on an ultrasonic inspection device and a neural network is proposed to evaluate the tension shearing load of each spot-welded joint. The network is configured by learning the pattern sets dealing with the interaction between the scanning graphs of the welded region using ultrasonic testing and tension shearing load of the joints. The input of the network is the echo height at each scanning position of the welded region. The output from the system was examined by comparing it with the experimental results, and the validity of the system was thereby confirmed.","PeriodicalId":143127,"journal":{"name":"JSME international journal. Series A, mechanics and material engineering","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1996-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120977533","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
Calculation of mechanical properties of solids using molecular dynamics method 用分子动力学方法计算固体的力学性能
JSME international journal. Series A, mechanics and material engineering Pub Date : 1996-10-15 DOI: 10.1299/JSMEA1993.39.4_606
N. Miyazaki, Yasunori Shiozaki
{"title":"Calculation of mechanical properties of solids using molecular dynamics method","authors":"N. Miyazaki, Yasunori Shiozaki","doi":"10.1299/JSMEA1993.39.4_606","DOIUrl":"https://doi.org/10.1299/JSMEA1993.39.4_606","url":null,"abstract":"We describe the calculation of mechanical properties of solids using the molecular dynamics method. The thermal expansion coefficient and elastic constants of α-Fe are calculated using an empirical potential, that is, the Johnson potential. The thermal expansion coefficient is calculated using a differential operation of the temperature dependence of the lattice constant obtained from the NPT ensemble molecular dynamics analysis. Reasonable agreement is found between the analytical results and measured data up to the phase transition temperature. The elastic constants are calculated from the stress-strain curves obtained from the NVT ensemble, the initial lattice constant of which is modified based on the result of the NPT ensemble. The analytical results agree reasonably well with the measured data up to 400 K.","PeriodicalId":143127,"journal":{"name":"JSME international journal. Series A, mechanics and material engineering","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1996-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130708546","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: 22
The education of mechanical engineers for the 21st century 21世纪的机械工程师教育
JSME international journal. Series A, mechanics and material engineering Pub Date : 1996-10-15 DOI: 10.1299/JSMEA1993.39.4_467
F. Kulacki
{"title":"The education of mechanical engineers for the 21st century","authors":"F. Kulacki","doi":"10.1299/JSMEA1993.39.4_467","DOIUrl":"https://doi.org/10.1299/JSMEA1993.39.4_467","url":null,"abstract":"The education of mechanical engineers must be viewed from several perspectives: the contextual basis in which engineering is practiced; the curricular framework, its foundations and educational outcomes; and the developmental path for engineering education in the next century. The basis of the current educational paradigm is examined and its suitability for the next century is critically discussed in light of the demands that will be placed on mechanical engineers over the next generation. Several features of the education of mechanical engineers are discussed to suggest options that both Japan and the United States may exercise. Possibilities for international collaboration in undergraduate and graduate education, precompetitive R&D, and technology transfer are suggested.","PeriodicalId":143127,"journal":{"name":"JSME international journal. Series A, mechanics and material engineering","volume":"36 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1996-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130193759","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
Finite element simulation of sintering process : Microscopic modelling of powder compacts and constitutive equation for sintering 烧结过程的有限元模拟:粉末压实体的微观模拟和烧结的本构方程
JSME international journal. Series A, mechanics and material engineering Pub Date : 1996-10-15 DOI: 10.1299/JSMEA1993.39.4_565
K. Shinagawa
{"title":"Finite element simulation of sintering process : Microscopic modelling of powder compacts and constitutive equation for sintering","authors":"K. Shinagawa","doi":"10.1299/JSMEA1993.39.4_565","DOIUrl":"https://doi.org/10.1299/JSMEA1993.39.4_565","url":null,"abstract":"Three-dimensional microscopic models of powder compacts for viscoplastic finite element analysis are developed to investigate the deformation behavior of powder particles during sintering. The repeating unit cells containing three types of pore with a regular arrangement are analyzed. Pore shrinkage due to surface tension during the intermediate stage of sintering is simulated. The volumetric strain rates of the unit cells are compared with that in a spherical shell model and the effect of the pore shape on the shrinkage rate and the sintering stress is discussed. A constitutive equation for sintering is proposed on the basis of the analyzed results. The sintering is described as the deformation process of viscous porous bodies under the action of the sintering stress. The proposed constitutive equation gives a good fit to the results obtained by experiment as well as the finite element analysis.","PeriodicalId":143127,"journal":{"name":"JSME international journal. Series A, mechanics and material engineering","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1996-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130453509","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: 16
A Model for Shear Stress Relaxation around a Fiber Break in Unidirectional Metal Matrix Composites 单向金属基复合材料纤维断裂周围剪应力松弛模型
JSME international journal. Series A, mechanics and material engineering Pub Date : 1996-10-15 DOI: 10.1299/JSMEA1993.39.4_517
N. Ohno, T. Yamakawa
{"title":"A Model for Shear Stress Relaxation around a Fiber Break in Unidirectional Metal Matrix Composites","authors":"N. Ohno, T. Yamakawa","doi":"10.1299/JSMEA1993.39.4_517","DOIUrl":"https://doi.org/10.1299/JSMEA1993.39.4_517","url":null,"abstract":"A model is presented to have insights into the shear stress relaxation around a fiber break in unidirectional metal matrix composites reinforced with long brittle fibers. A cylindrical cell containing a broken fiber is considered, and a bilinear approximation of the fiber stress distribution in the broken fiber is employed to derive a simple differential equation for the shear stress relaxation. The resulting relaxation equation is applied to the cell subjected to either constant or increasing strain. It is thus shown that the shear stress relaxes very slowly in comparison with the axial normal stress in the matrix, and that the analytical solution obtained in the case of constant strain agrees well with the numerical analysis performed by Du and McMeeking. It is also shown that the relaxation equation under constant strain is almost derivable on the basis of the overall balance of energy in the cell. In addition effect of the radial gradient of shear stress in the matrix is discussed.","PeriodicalId":143127,"journal":{"name":"JSME international journal. Series A, mechanics and material engineering","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1996-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114349923","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
Transient Dynamic Large-Deflection Analysis of Panel Structure under Blast Loading 爆炸荷载作用下板结构瞬态动态大挠度分析
JSME international journal. Series A, mechanics and material engineering Pub Date : 1996-10-15 DOI: 10.1299/JSMEA1993.39.4_591
T. Teng, C. Liang, Ching-Cho Liao
{"title":"Transient Dynamic Large-Deflection Analysis of Panel Structure under Blast Loading","authors":"T. Teng, C. Liang, Ching-Cho Liao","doi":"10.1299/JSMEA1993.39.4_591","DOIUrl":"https://doi.org/10.1299/JSMEA1993.39.4_591","url":null,"abstract":"The transient dynamic response of a panel structure subjected to blast loading was investigated, as simulated by the step function and the exponentially decaying function. Based on the Bauer methodology, and applying Galerkin's method, the von Karman nonlinear equations of plates could be transformed into Duffing-type nonlinear ordinary differential equations and then solved by adopting the Lindstedt-Poincare perturbation method. The complete analysis of square plates was carried out for all-clamped and all-simply supported edge conditions. The results of deflection history and stress resultants using one perturbation term were sufficiently correlated with results both from related literature and obtained by the finite-element method.","PeriodicalId":143127,"journal":{"name":"JSME international journal. Series A, mechanics and material engineering","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1996-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121168641","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: 15
Crack Initiating Limit for Cladding Tubes of PWR RCCA Rodlets Subject to Absorber Swelling 吸收器膨胀作用下压水堆RCCA棒包壳管裂纹起裂极限
JSME international journal. Series A, mechanics and material engineering Pub Date : 1996-10-15 DOI: 10.1299/JSMEA1993.39.4_555
Takanori Matsuoka, M. Mori, Kazuhiro Nakamura, Hisashige Myojin, T. Nagata
{"title":"Crack Initiating Limit for Cladding Tubes of PWR RCCA Rodlets Subject to Absorber Swelling","authors":"Takanori Matsuoka, M. Mori, Kazuhiro Nakamura, Hisashige Myojin, T. Nagata","doi":"10.1299/JSMEA1993.39.4_555","DOIUrl":"https://doi.org/10.1299/JSMEA1993.39.4_555","url":null,"abstract":"On-site measurement of the outer diameter of rodlets and hot cell examination of typical rodlet tips were carried out for the rod cluster control assembly (RCCA) of a PWR plant after 10 cycles. The main objectives of the examination are to investigate the extent of degradation of control rods and to determine the cracking mechanism involved since cracks are observed in a number of cladding tubes near the tips. In this study, the crack initiating limit for cladding tubes of PWR RCCA rodlets subject to absorber swelling is investigated. Although the cladding tube material consists of a ductile material, 304 S. S., it should be treated as low ductile material that is intermediate between a ductile and a brittle material because its ductility is reduced by neutron irradiation. The crack initiating strain limit for the low ductile material is investigated and is obtained as follows. e cr =e ue + 1/2e up where e cr : crack initiating strain, e ue : elastic component of uniform strain, e up : plastic component of uniform strain The proposed crack initiating strain limit shows good agreement with the results of on-site examination. Axial cracking in RCCA rodlets can be prevented if RCCAs are replaced when the total amount of neutron fluence reaches approximately 8 x 10 21 n/cm 2 (E>1 MeV). Moreover, it is possible to increase the lifespan of a RCCA by increasing the gap between the cladding tube and the absorber.","PeriodicalId":143127,"journal":{"name":"JSME international journal. Series A, mechanics and material engineering","volume":"30 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1996-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124871495","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
Constitutive Model for Coupled Inelasticity and Damage 非弹性与损伤耦合本构模型
JSME international journal. Series A, mechanics and material engineering Pub Date : 1996-10-15 DOI: 10.1299/JSMEA1993.39.4_508
M. Kawai
{"title":"Constitutive Model for Coupled Inelasticity and Damage","authors":"M. Kawai","doi":"10.1299/JSMEA1993.39.4_508","DOIUrl":"https://doi.org/10.1299/JSMEA1993.39.4_508","url":null,"abstract":"A constitutive model to describe a coupling between deformation and damage due to creep of polycrystalline metallic materials is developed from phenomenological and continuum mechanics points of view. The constitutive modeling is based on the irreversible thermodynamics for internal state variable theories, where the thermodynamic potentials, i.e., free energy and dissipation energy functions, are defined using hardening and damage variables. The material damage is assumed to be isotropic. We first derive a damage coupled kinematic-hardening model in the invariant form on the basis of the Malinin-Khadjinsky model. Then, an isotropic-hardening model which includes a coupling with damage is formulated by assuming a particular representation of the kinematic hardening variable. The evolution equation of the hardening variable is prescribed by the Bailey-Orowan format which includes the effect of damage. The damage rate is governed by the magnitude of the assumed strain hardening variable. These models can describe a transition from primary to tertiary creep stages, and it is applicable to variable loading conditions. In a particular case the expression for the creep rupture time has a similar form to the Kachanov-Rabotnov type, although it depends on the time and damage at the instant of a hardening saturation under the applied stress condition.","PeriodicalId":143127,"journal":{"name":"JSME international journal. Series A, mechanics and material engineering","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1996-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127871326","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 Phosphorus Doping on Crystallization-Induced Stress of Silicon Thin Films 磷掺杂对硅薄膜结晶诱导应力的影响
JSME international journal. Series A, mechanics and material engineering Pub Date : 1996-10-15 DOI: 10.1299/JSMEA1993.39.4_620
H. Miura, A. Nishimura
{"title":"Effect of Phosphorus Doping on Crystallization-Induced Stress of Silicon Thin Films","authors":"H. Miura, A. Nishimura","doi":"10.1299/JSMEA1993.39.4_620","DOIUrl":"https://doi.org/10.1299/JSMEA1993.39.4_620","url":null,"abstract":"The effect of phosphorus doping on the crystallization-induced stress of silicon thin films is discussed experimentally. Amorphous silicon thin films are deposited on thermally-oxidized silicon substrates using chemical vapor deposition. Phosphorus is doped to the film during film deposition using PH3 gas. The initial residual stress of the phosphorus doped films is constant at -200 MPa, regardless of dopant concentration. The internal stress of the films changes to a tensile stress of 800 MPa during crystallization due to film shrinkage. Although the magnitude of the stress change is independent of the dopant concentration, the crystallization temperature of the film decreases with an increase of dopant concentration. The doped phosphorus at the film/ substrate interface affects the crystallization process, i.e., the structure and crystallinity of the silicon thin films. The surface condition of the substrate also affects the crystallinity and crystallization-induced stress of the film.","PeriodicalId":143127,"journal":{"name":"JSME international journal. Series A, mechanics and material engineering","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1996-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131937978","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
Analysis of Bias-Type Actuator Using Shape Memory Alloy Based on Its Thermomechanical Constitutive Description 基于热力学本构描述的形状记忆合金偏置驱动器分析
JSME international journal. Series A, mechanics and material engineering Pub Date : 1996-10-15 DOI: 10.1299/JSMEA1993.39.4_526
S. Biwa, Kenichi Yamada, E. Matsumoto, T. Shibata
{"title":"Analysis of Bias-Type Actuator Using Shape Memory Alloy Based on Its Thermomechanical Constitutive Description","authors":"S. Biwa, Kenichi Yamada, E. Matsumoto, T. Shibata","doi":"10.1299/JSMEA1993.39.4_526","DOIUrl":"https://doi.org/10.1299/JSMEA1993.39.4_526","url":null,"abstract":"Dynamic behaviour of a bias type actuator using Ti-Ni shape memory alloy is examined theoretically as well as experimentally. The constitutive and the heat equations for the shape memory alloy, derived in the framework of continuum thermomechanics with phase transformation taken into account, are employed to describe the response of the considered actuator to applied electric input varying in time. Material parameters in the constitutive model adopted are determined from uniaxial loading unloading tests at different temperatures. An experimental setup of the actuator, consisting of a shape memory alloy wire and a bias spring connected serially, is also manufactured, and the response of the actuator to cyclic electric input is measured. The experimental results obtained are compared with the predictions of the analytical model, which proves promising to describe the behaviour of the actuator very well in terms of its dependence on various factors such as the rigidity of the bias spring, as well as the magnitude and the period of cyclic input.","PeriodicalId":143127,"journal":{"name":"JSME international journal. Series A, mechanics and material engineering","volume":"32 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1996-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123744377","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
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