Fatigue life prediction for a cracked notched element under symmetric load condition

摘要

In this paper the crack growth emerging from a notch is studied for round bar under symmetric load condition. modifying and synthesising some models found in literature, a method for fatigue life prediction is outlined and verified. The model takes into accunt the elastic-plastic crack growth and the change of crack shape during propagation. Overall life is divided in two parts: first a surface emerging crack propagates in the 3 D stressed region, then a Paris law stable propagation is assumed.