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The elastic waves interfering with the plastic process zone on the crack front is proposed to explain such dynamic crack instability.
The crack propagation behavior can be tuned from unstable to stable manner without sacrificing the crack initiation during the opening mode test.
The crack deflection is due to redistribution of contact loading.
Equivalent plastic strain was proved effective to predict crack initiation.
Therefore, a unified local approach is feasible to model both crack initiation and crack propagation.
Therefore, it cannot sufficiently reflect the mechanical behaviour surrounding the crack.
The case studies show how the crack initiation angle can be reasonably estimated with this methodology and how this approach provides realistic values of fracture toughness KIC and fracture energy Gf.
also show that, due to the dissipation of energy inside the cohesive zone, the energy required for crack propagation increases with the crack speed.
The developed procedures simplify the analysis of the description of mechanical fields at a greater distance from the crack tip considerably.