Techniques of analysis of load-displacement records by J-integral methods

Abstract

Exact methods are used to obtain J from a single load displacement record for different configurations based on dimensional analysis and deformation theory of plasticity to imply the dependence of the load on crack length and displacement. The methods also permit the evaluation of the crack length increment a and hence complete J-R curves can be constructed. Formulae for T/sub mat/ and T/sub app/ are presented as well. Conditions for the existence of the so-called eta-factor are stated, and subsequent simplifications of the general method by its use are shown. Results of analysis of experimental work for different configuration material combinations are presented showing the adequacy of the general methodology.