Response: Discussion of “J integral analysis of stable crack growth,” by S. J. Burns [1]

✍ Scribed by I.-H Lin; J. P. Hirth; A. R. Rosenfield

• Publisher: Springer Netherlands
• Year: 1980
• Tongue: English
• Weight: 201 KB
• Volume: 16
• Category: Article
• ISSN: 1573-2673
• DOI: 10.1007/bf00018243

✦ Synopsis

Burns [i] has asserted that, in general, the formulation of J that we proposed recently [2] only applies to a very restricted class of test specimens, mainly including constant J specimens. He suggests that in the general case J is a state function [3] of two variables among: displacement angle @ associated with the crack region, i.e., @ ~ @c, uncracked ligament length b and bending moment M for a bend bar of thickness B. In such a case, we agree with his formulation, part of which [3] anticipates our earlier work [2], and indeed we show that it also agrees with the recent work of Ernst et al. [4]. However, there are situations where the work of cracking leading to J is in fact reversible, but j need not be a function of any state variable or where J is some representation of irreversible processes and hence where his formulation need not apply.