Abstract
AbstractIn this paper a short theoretical background about elastic-plastic fracture mechanics is presented and the O’Dowd-Shih theory is discussed. Using FEM, the values of the Q-stress determined for various elastic-plastic materials for two specimens in tension — SEN(T) specimen and CC(T) specimen are presented. The influence of geometry of the specimen, crack length and material properties (work-hardening exponent and yield stress) on the Q-parameter are tested. The numerical results were approximated by closed form formulas. The results are summarized in a catalogue of the Q-stress value, which may be used in engineering analysis for calculation of the real fracture toughness and the stress distribution near crack tip.
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