An ordinary state based peridynamic correspondence model for metal creep

Abstract

Creep is a major failure mode of metal components that operate for long periods at elevated temperatures under high loads. Accurate prediction of the creep damage is very important for the structural integrity of such components. Current techniques for modeling creep are based on using fracture mechanics or damage mechanics in conjunction with finite element methods. Using the finite element method for tracking the crack path can be cumbersome. In this paper, to alleviate tracking the creep crack path, we propose an ordinary state-based peridynamic correspondence model using the Liu-Murakami damage model for modeling the creep. The peridynamics formulation of the Liu-Murakami model is derived. The influence function of peridynamics is modified to incorporate classical creep damage parameter from the Liu-Murakami model into the peridynamics formulation. To demonstrate the capability of the proposed method, the results obtained from the proposed methodology are compared with those obtained using finite elements.