CORRELATION BETWEEN J-INTEGRAL AND CMOD IN IMPACT BEHAVIOR OF 3-POINT BEND SPECIMEN

摘要

Numerical calculations are made in order to find a possible correlation between the J-integral and the crack mouth opening displacement (CMOD) in dynamic nonlinear fracture experiments of 3-point bend (3PB) specimens. Both elastic-plastic and elastic-viscoplastic materials are considered at different impact velocities. The J-integral may be estimated from the crack mouth opening displacement which can be measured directly from photographs taken during dynamic experiments.