Mechanics of Dynamic Debonding

摘要: Singular fields around a crack running dynamically along the interface between two anisotropic substrates are examined. Emphasis is placed on extending an established framework for fracture mechanics to include rapidly applied loads, fast propagation and strain rate dependent material response. For at non-uniform speed, tip behaviour governed by instantaneous steady-state, two-dimensional singularity. This simplifies problem, rendering Stroh techniques applicable. In general, singularity oscillates, similar quasistatic cracks. The oscillation index infinite when runs Rayleigh wave speed of more compliant material, suggesting large contact zone may exist behind high speeds. contrast in homogeneous materials, has finite energy factor lower speed. presented isotropic bimaterials, so key quantities orthotropic bimaterials. Implications branching substrate cracking discussed. Dynamic stress intensity factors bimaterials solved several basic steady state configurations, including Yoffe, Gol'dshtein Dugdale problems. Under time-independent loading, dynamic can be factorized into its equilibrium counterpart universal functions