A Cohesive model of fatigue crack growth
We investigate the use of cohesive theories of fracture, in conjunction with the explicit resolution of the near-tip plastic fields and the enforcement of closure as a contact constraint, for the purpose of fatigue-life prediction. An important characteristic of the cohesive laws considered here is that they exhibit unloading-reloading hysteresis. This feature has the important consequence of preventing shakedown and allowing for steady crack growth. Our calculations demonstrate that the theory is capable of a unified treatment of long cracks under constant-amplitude loading, short cracks and the effect of overloads, without ad hoc corrections or tuning.
© Kluwer Academic Publishers 2001. Received 15 December 1999; accepted in revised form 15 January 2001. Support from the Office of the Naval Research through grant N00014-96-0068 is gratefully acknowledged. We are grateful to Dr Abe Askari of The Boeing Co. for helpful suggestions and discussions.