Abstract
In this note a numerical simulation for a stable crack extension process has been worked out by an incremental finite element method. Utlizing the critical opening angle at the crack tip and accounting for the effect of stress history, we have visualized the stable crack extension process from initiation to instability. Several field variables including J- integrals , stresses and strains, have been computed for every incremental load step. It appears that the critical opening angle at the crack tip may serve as an important parameter in these fracture phenomena including the stable crack extension process. Based on the numerical results an idea for a nonlinear fracture criterion is proposed.
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