Abstract
A Dugdale model for hardening materials under plane stress conditions is proposed. Crack tip opening displacements (CTODs) of different geometries, compact, center crack tension, double edge crack tension and three point bend specimens, have been calculated by means of the weight function method. The results have been compared with the J- integral from EPRI's handbook [Y. Kumar, M.D. German and C.F. Shih, EPRI NP-1931, Project 1237-1, Technical Report (1981)] for strain hardening exponent n = 3, 5,7,10,13,16,20 and two different Ramberg-Osgood coefficients. The results indicate that the proposed model could well correlate CTODs from the Dugdale model and the J- integral , thus it is an alternative tool to take account of the strain hardening effect in engineering applications.
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