MECHANICAL LOADING AND CYCLIC HEATING PHASE SHIFT EFFECT ON FATIGUE CRACK PROPAGATION RATE--PART 1. PHASE SHIFT EFFECT ON THE SIZE OF A PLASTIC ZONE IN THE CRACK TIP

摘要

Calculations of the stress-strain state in the crack tip during mechanical loading and cyclic heating with account of the kinetics of loading parameters and material properties per cycle have shown that the maximal size of a plastic zone in cases of in-phase and antiphase mechanical loading and cyclic heating differ by 2.77 times. In the in-phase case, fatigue crack propagation rates are three times higher than the antiphase ones at the same stress intensity factor values.