Abstract
In order to estimate the load and elastic-plastic deformation behaviour of cracked structures, methods must take into account the influence of arbitrarily shaped real material laws on the J integral and displacement behaviour, at least in an approximate form in the sense of an engineering approach. Such methods are generated and discussed in this paper. They are based on the well-known formulas in the EPRI Handbook, which are valid only for specific power laws. An extensive study has been carried out using idealised material laws with two distinct strain-hardening regions. The influence on J has been evaluated by a systematic variation of the parameters of these idealised material laws in an unambiguous way. The approximation methods generated have been compared with finite element (FE) calculations, and their accuracy with respect to load- J curves is discussed.
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