Separable functions in load separation for the eta_(pl) and eta_(pl)~(CMOD) plastic factors estimation

摘要

The objective of this paper is to develop the load separation method for evaluating the eta_(pl) and eta_(pl)~(CMOD) plastic factors used in the J estimation approach based on load versus displacement records. Appropriate forms for the geometry and deformation functions have been suggested from the EPRI Handbook solutions to produce the separable form for the load. The obtained functions are applied to evaluate the eta_(pl) and eta_(pl)~(CMOD) plastic factors for center cracked tension specimen. The present load separation method gave results which are somewhat different from the estimated values of eta_(pl)given in the literature. For shallow cracks, the eta_(pl) and eta_(pl)~(CMOD) plastic factors show considerable variation with crack size and the strain hardening exponent. For a deeply cracked CCT specimen, the eta_(pl)~(CMOD) factor tends to the eta_(pl) factor and equals approximately unity.