In the series of papers, the authors proposed the fracture criteria for mode I (opening type) fracture and mode II (shear type) fracture in a mixed-mode crack based on the CED (crack energy density) in an arbitarry direction, εφ, and the applicability of these criteria to mixed-mode crack has been investigated through the fracture experiments of specimens with an inclined crack under tensile/shear type loading. In this paper, the evaluation method of εφ by finite element method is studied. Elastic-plastic finite element analyses are carried out for the above mentioned fracture experiments and εφ and its contribution of each mode are evaluated by path-independent integrals and the method based on load-displacement curves. Based on the results, we examine the fundamental properties in the evaluation of εφ and so on in elastic case and, simultaniously, develop a practical method to evaluate εφ and so on in elastic-plastic case which makes the application of the fractrure criteria to the fracture of a mixed-mode crack realistic and easy.
|Transactions of the Japan Society of Mechanical Engineers Series A
|Published - 1993
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