Issue 49

Yu. G. Matvienko, Frattura ed Integrità Strutturale, 49 (2019) 36-43; DOI: 10.3221/IGF-ESIS.49.04 42 follows p p A S  . In this case, the separation of the constraint parameter and the J -integral improves the quality of a fracture criterion in two-parameter elastic-plastic fracture mechanics. It was shown that there is a unique relationship between the constraint parameters p S and A in a wide range of specified values of strain p  . a) b) c) Figure 4 : Equivalent plastic strain isolines for A/A SSY with minimal, average and maximal values (left); the constraint parameter p S as a function of the parameter A (right): n =5, p  =0.1 (a), p  =0.2 (b) and p  =0.3 (c).