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Article type: Cover
1995 Volume 5 Issue 4 Pages
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Published: December 15, 1995
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Article type: Index
1995 Volume 5 Issue 4 Pages
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Article type: Index
1995 Volume 5 Issue 4 Pages
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Genki Yagawa
Article type: Article
1995 Volume 5 Issue 4 Pages
287-
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Article type: Appendix
1995 Volume 5 Issue 4 Pages
288-290
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Yutaka Toi
Article type: Article
1995 Volume 5 Issue 4 Pages
291-292
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Toshihisa Nishioka
Article type: Article
1995 Volume 5 Issue 4 Pages
293-313
Published: December 15, 1995
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This article devotes to an attempt at reviewing mathematical and computational studies in fracture mechanics. However, since the related literature is considerably vast, the selected topics are almost confines to the regime of elastic fracture mechanics. Furthermore, only fundamental aspects constituting the basis of the current fracture mechanics are reviewed. The relevant major topics are (i) asymptotic eigen expansions of various crack-tip fields, (ii) the VNA solution for an elliptical crack subject to arbitrary traction forces and its applications to the Schwartz-Neumann alternating method, (iii) path-independent integrals, (iv) three basic types in fracture simulation, and (v) hybrid numerical methods in fracture mechanics researches.
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Kikuo Kishimoto
Article type: Article
1995 Volume 5 Issue 4 Pages
314-328
Published: December 15, 1995
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The elastic singular stress field of a bimaterial plate are examined for the case when surface traction is free in the vicinity of the bonding edge. It is shown that in addition to the case of inter facial crack, the elastic singular fields at the bonding edge can be classified into three types depending on the combination of elastic properties and bonding angles, i. e. the characteristic equation determining the strength of the singularity has (1) one real value, (2) two real values and (3) complex value. Suitable expressions of the singular stress field which are consistent with those of crack problems are presented. Finite-element analyses have been performed and features of the stress distribution are disucussed for each of the three cases.
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Sumio Murakami
Article type: Article
1995 Volume 5 Issue 4 Pages
329-345
Published: December 15, 1995
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A review of Continuum Damage Mechanics (or simply, damage mechanics) with special emphasis on its applicability to the damage and fracture analysis of stuctural elements is presented. Notion of damage mechanics, mathematical description of material damage, fundamental theories of the constitutive and evolution equations of damaging materials are discussed first. Irreversible themodynamical theory to formulate the constitutive and evolution equations is presested as a systematic framework to establish rational models. Finally, applicability and the related numerical problems of the local approach to fracture based on the damage mechanics and the finite element method are discussed, especially in relation to the problems of creep crack growth analysis. The convergence of the solutions and the procedures to suppress the mesh-dependence of the results are also discussed.
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Masataka Tokuda
Article type: Article
1995 Volume 5 Issue 4 Pages
346-358
Published: December 15, 1995
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The author has studied the strength of materials in the department of mechanical engineering for almost 25 years. The educations and research works in the field of strength of materials have remarkably changed with the development of computer, as seen in almost all other engineering fields. That is, the main content of researches and educations in the strength of materials has been shifting from the so-called structural analyses to the mechanical properties of engineering materials. In this research of mechanical properties, the meso-scopic mechanical approach has remarkably developed and delivered the significant contributions. What is the meso-scopic approach? What kind of role does the meso-scopic approach have. In this paper, the author tries to answer to such questions for somewhat out-of-field people, as simple as possible, by using the research activities of plasticity as an example.
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Yutaka Toi
Article type: Article
1995 Volume 5 Issue 4 Pages
359-369
Published: December 15, 1995
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The three-dimensional meso-analysis method for brittle microcracking solids is described with some of numerical examples. This kind of research can be considered as a part of a new field of 'mesomechanics' which aims at solving interactions of macro-mechanics and micro-structures in solids using as a tool computer simulations with discontinuum mechanics models. The present 3-d meso-analysis method is a general-purpose approach which is applicable to various fracture and constitutive behaviors of brittle microcracking solids. The continuum damage mechanics models enhanced through results of the 3-d meso-analysis can be effectively used in the finite element analysis of overall strength. In other words, the present research has given a computational method of fracture analysis for brittle microcracking solids at multi-scales encompassing meso- to macro-scale.
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Hiroshi Kitagawa
Article type: Article
1995 Volume 5 Issue 4 Pages
370-383
Published: December 15, 1995
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Computer simulation using atomic/molecular modelling may be revolutionalizing the analysis and research technology in engineering material science. It has potentiality to bridge a gap between phenomenological and physical approaches in the computational materials science. The former, i.e. computational continuum mechanics, can enter into nothing about reality of the material itself, because the formulation principle of the constitutive properties is treated as a mathematical problem, not mechanical (physical) problem. The atomic simulation improves drastically the defect in the computational mechanics. Molecular dynamics simulation gives an abundance of valuable information with respect to structural dynamics in atomic scale regardless of non-equilibrium or non-uniform state, if the interatomic interaction is described properly. Further ab initio estimation of the material properties is feasible by means of quantum molecular dynamics, which means that we can understand completely the substance of the materials without any empirical data.
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Yoichi Ishida
Article type: Article
1995 Volume 5 Issue 4 Pages
384-387
Published: December 15, 1995
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Kokichi Sugihara
Article type: Article
1995 Volume 5 Issue 4 Pages
388-391
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Masatake Mori
Article type: Article
1995 Volume 5 Issue 4 Pages
392-
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Takashi Kako
Article type: Article
1995 Volume 5 Issue 4 Pages
393-
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Hiroshi Imai
Article type: Article
1995 Volume 5 Issue 4 Pages
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Kazuo Kishimoto
Article type: Article
1995 Volume 5 Issue 4 Pages
395-
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Article type: Appendix
1995 Volume 5 Issue 4 Pages
396-398
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Yoshimitsu Iwasaki
Article type: Article
1995 Volume 5 Issue 4 Pages
399-400
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Sigeo Ihara
Article type: Article
1995 Volume 5 Issue 4 Pages
400-401
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Article type: Appendix
1995 Volume 5 Issue 4 Pages
402-403
Published: December 15, 1995
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Article type: Index
1995 Volume 5 Issue 4 Pages
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Article type: Appendix
1995 Volume 5 Issue 4 Pages
406-
Published: December 15, 1995
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Article type: Cover
1995 Volume 5 Issue 4 Pages
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Published: December 15, 1995
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