三次元き裂の応力拡大係数解析の自動化

概要

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This paper describes a new automated system for analyzing the stress intensity factors of three-dimensional cracks. Mesh refinement is well controlled by the fuzzy knowledge processing technique, while nodes and tetrahedral elements are generated quite rapidly by the computational geometry techniques. Material properties and boundary conditions are easily attached onto a generated mesh by clicking parts of geometrical model, such as loops or edges, using a mouse, and by inputting values. For accurate analyses of the stress intensity factors, the singular elements in which mid-point nodes near the crack front are shifted to quarter-points are automatically placed along the three-dimensional crack front. The complete finite element model generated is given to one of the commercial finite-element codes, MARC, and a stress anaysis is performed. Stress intensity factors are also automatically calculated, using the displacement extrapolation method. To demonstrate the practical performance of the present system, it is applied to the analysis of surface cracks in a plate subjected to uniform tension.
一般社団法人日本機械学会の論文
1995-07-25