Experimental Validation of Dynamic Fragmentation Simulations
نویسندگان
چکیده
Large scale simulations using cohesive zone interfacial elements were used to understand features such as penetration and deflection of crack during the process of interaction of mode-I crack with inclined interfaces. To perform these simulations, two set of inputs are necessary. The first one is to provide valid loading boundary conditions and the second one is to incorporate accurate cohesive zone laws in the dynamic fracture of the simulated specimen. To meet the first input, a modified Hopkinson bar setup has been used to accurately control initial and boundary conditions. In case of second one, an inverse formulation approach will be used to extract cohesive zone laws for both mode-I and mixed mode conditions. Dynamic photoelasticity coupled with high-speed photography is used to capture real-time experimental records associated with crack propagation. An initial experimental study has already been conducted to identify important parameters that affect the penetration and deflection behavior. It has been observed that incoming crack tip velocity and mode mixity have influence on the nature of crack propagation along the interface. To validate these observations, an extensive set of well controlled experiments will be conducted. A comparison of simulation results with those of experiments will be presented.
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