Why do cracks branch? A peridynamic investigation of dynamic brittle fracture

摘要: In this paper we review the peridynamic model for brittle fracture and use it to investigate crack branching in homogeneous isotropic materials. The simulations offer a possible explanation generation of dynamic instabilities growth branching. We focus on two systems, glass homalite, often used experiments. After brief theoretical computational models branching, discuss linear elastic–brittle Three loading types are role stress waves interactions propagation analyze influence sample geometry Simulation results compared with experimental ones terms patterns, speed at angles. indicate that as intensity around tip increases, pile-up against material directly front moves advancing crack; process “deflects” strain energy away from symmetry line into surfaces creating damage line. This “migration”, seen roughness surface experiments, modifies, turn, landscape leads preferential directions branch original argue nonlocality is one key feature modeling phenomenon fracture. show that, least first order, no ingredients beyond elasticity capable necessary explain/predict