A peridynamic modeling approach of solid state impact bonding and simulation of interface morphologies

摘要

Peridynamics was originally developed to model spontaneously emerged discontinuities such as crack propagation and progressive failure. In this paper, contrary to typical peridynamic applications in the realm of modeling of discontinuities, a modeling approach is proposed in the framework of non-ordinary state-based peridynamics to simulate impact-driven solid-state welding processes that can effectively join a wide variety of similar and dissimilar combinations of materials. A scheme to model formations of metallurgical bonds resulting from severe plastic deformation due to high-velocity impact is developed in virtue of peridynamic bonds. The proposed model is of combined Lagrangian-Eulerian nature, given that nonlocal interactions are established on both reference and deformed configurations. Impact bonding processes of single- and bi-material joints are successfully simulated and validated. Distinctive morphological features of bonding interface are reproduced. Effectiveness and robustness of the proposed modeling approach are demonstrated by a numerical study of influences of processes variables on the morphology and stability of interface features.