CRACK GROWTH PER CYCLE BY BLUNTING AND VOID GROWTH

摘要

The blunting mechanism for fatigue crack growth depends only on large geometry changes and plastic flow at the cracktip. This is analysed numerically for the range of zero-to-positive values of the applied K{sub}1. Non-hardening perfect plasticity is used, where the hysteresis loop is reasonably represented, even for a high number of cycles. The possibility of void growth under the cyclic plasticity conditions prevailing in the near-tip region is analysed, as is relevant to the regime of high ΔK{sub}1 levels, where static fracture modes such as fibrous failure are sometimes observed.