Papers by Keyword: Crack Propagation Analysis

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Authors: Yoshitaka Wada, Masaki Sato, Yohei Orita, Masanori Kikuchi
Abstract: Recent development of crack propagation analysis is rapidly advanced and its applications are being extended. Usually finite element method is utilized for the analysis. One of the most important tasks is mesh generation which requires fully automated system and no failures. It is very difficult to meet all geometrical and mechanical requirements for a surface mesh generation. Recent studies show a factory roof is easily generated under mixed mode loading. How to generate surface crack tetrahedral mesh without failures and surface crack analysis with factory roof are presented.
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Authors: Hiroshi Okada, Hiroshi Kawai, Kousuke Araki, Tsubasa Miyazaki
Abstract: This paper describes the development of a software to perform three-dimensional crack propagation analyses. The software is based on the conventional finite element method with second order tetrahedral element and an automatic mesh generation software. Hexahedral finite elements have historically been used in fracture analyses and methodologies to compute the crack parameters have been developed for the hexahedral elements. In present research, the authors have developed a VCCM (virtual crack closure-integral method) for the second order tetrahedral finite element. Use of the tetrahedral element allows us to utilize an automatic mesh generation software. The direction and rate of crack propagation are predicted based on the stress intensity factors and the shape of crack is updated. Hence, a software package containing the modules for mesh generation, for finite element analysis, for stress intensity factor evaluation, for predicting the rate and the direction of crack propagation and for updating crack configuration, can be developed.
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