The major objective of this work has been to apply a new compatibility-based fracture theory to the investigation of dynamic failure of polycrystalline metals and alloys. To model the nucleation and propagation of failure surfaces at the microstructural scale, under large deformations and dynamic loading conditions, a general fracture criterion based on the integral law of compatibility is used. This new fracture criterion, was coupled with rate-dependent dislocation-density based crystalline plasticity formulations to elucidate the microstructural mechanisms related to the evolution of intergranular and transgranular failure and to understand how grain sizes and strain-rate sensitivity affect aggregate strength, ductility, and dynamic damage tolerance. It is shown that cracks commonly nucleate at triple junctions and at grain boundaries as intergranular cracks, and that slip bands through grains result in transgranular cracks.
Dynamic fracture Cracks Polycrystals Crystalline plasticity Dislocation densities Large deformations Finite elements
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Ali AA, Podus GN, Sirenko AF (1979) Determining the thermal activation parameters of plastic deformation of metals from data on the kinetics of creep and relaxation of mechanical stresses. Strength Mater 11(5): 496CrossRefGoogle Scholar
Anthony K.-H, Azirhi A (1995) Dislocation dynamics by means of lagrange formalism of irreversible processes—complex fields and deformation processes. Int J Eng Sci 33(15): 2137–2148CrossRefGoogle Scholar
Ashmawi W, Zikry M (2002) Prediction of grain-boundary interfacial mechanisms in polycrystalline materials. J Eng Mater Technol 124(1): 88–96CrossRefGoogle Scholar
Camacho GT, Ortiz M (1996) Computational modelling of impact damage in brittle materials. Int J Solids Struct 33(20-22): 2899–2938CrossRefGoogle Scholar
Elkhodary KI, Zikry MA (2011) A fracture criterion for finitely deforming crystalline solids—the dynamic fracture of single crystals. J Mech Phys Solids 59(10): 2007–2022CrossRefGoogle Scholar