An extended state-based peridynamic model for damage growth prediction of bimaterial structures under thermomechanical loading

An extended ordinary state-based peridynamic model considering thermomechanical loading is presented to predict damage growth of bimaterial structures, such as cermet. In this new model, the three-dimensional (3D) and two-dimensional (2D) (both plane stress and strain) cases are all considered. As examples, 2D bimaterial beams and 3D thick plates are analyzed under thermal loading and three-point bending. m-convergence and δ-convergence are discussed in the cases of 2D verification, and comparison of displacement with finite element model shows great accuracy of the extended model. Damage growth (in term of crack propagation) of bimaterial beams due to incremental thermal loading and three-point bending is investigated. The new model successfully captures interface crack propagation in bimaterial beams under thermal loading as well as crack growth within substrate material and at bimaterial interface under quasi-static and impact loading. Distribution of elastic strain energy density is analyzed during dynamic crack propagation under impact loading.