摘要：The strip yield model is known as one of numerical models for the estimation of the crack opening displacement and the plastic zone ahead of a crack tip. This model, however, is not able to allow the consideration of the work hardening effect of materials because this model is based on the elastic-perfect plastic material behavior.Authors developed the strip yield model allowing the consideration of work hardening effects beyond the small scale yielding.This model incorporates a nonuniform cohesive stress, which is a function of the material work hardening coefficient (the second modulus or the strain hardening exponent). The relationship between the crack opening displacement over a fictitious crack obtained by the strip yield model and the plastic strain distribution in the vicinity of a crack tip by the elastic-plastic finite element analyses is investigated. The model proposed with the weight function technique is applicable to the estimation of crack opening displacement for arbitrary two-dimensional crack problem.
