Explosively generated pulse propagation through particles containing natural cracks

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An experimental study is conducted to study dynamic load transfer through particulate assemblies containing a damaged particle. The assembly is simulated by a one-dimensional array of circular disks, and the damage itself by a natural, zero-width crack. This assembly is explosively loaded and the dynamic load transfer process observed using dynamic photoelasticity and strain gages, as the stress wave pulse propagates down the assembly. Attention is focussed on the influence of damage size and orientation on the group wave velocity, wave dispersion and peak contact load attenuation of the stress wave pulse. Damage growth occurring from the interaction of the stress wave pulse with the closed natural crack tip is also studied. The results demonstrate that the inclusion of a damaged particle greatly influences the load transfer process, both locally and in the far field. The degree to which the damaged particle modifies the load transfer process is more dependent upon the orientation of the natural crack than upon the size of the crack. Moreover, damage growth within the damaged particles is also a strong function of the orientation of the natural crack.

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Mechanics of Materials