METHODOLOGIES FOR PREDICTING J-INTEGRALS UNDER LARGE PLASTIC-DEFORMATION .2. SINGLE-EDGE NOTCH SPECIMENS IN PURE BENDING

The paper continues the theme of Part I and presents a J-based estimat ion scheme for the single edge notch specimens in bending (SENB) geome try. Finite element calculations were carried out to analyse geometrie s with shallow cracks (0.02 less than or equal to a/W less than or equ al to 0.1) and the full range of the work hardening exponent n = 1 to infinity. Based on the relationship between the deformation patterns a nd the J-strain curves, the scheme was formulated in three parts (Line ar Elastic, Elastic-Plastic and Fully Plastic) and an estimation equat ion was derived for each. The scheme has been shown to provide very ac curate predictions of the J-strain relationships for the medium to low work hardening cases of 5 less than or equal to n less than or equal to 30. The accuracy of prediction is within 5%. For the high work hard ening cases, the scheme for tension loading presented in Part I can be used to provide conservative estimates.