Experimental study on dynamic behavior of radial crack under blast loading
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Abstract
Dynamic caustics in conjunction with high speed photography was utilized in experiments to study the influence of explosive stress wave and explosion propagation crack on the dynamic behavior of the directional crack formed by the priority detonation blasthole.The results show that the compression stress wave of the P wave front of the explosion stress wave makes the crack surface close and the stress intensity factor decreases;P wave tail tensile wave and SV wave make the crack open deformation and the stress intensity factor increases.The irregularity of the crack surface and the sudden change in the thickness of the open crack make the cuspoid curves along the crack surface during the interaction between the SV wave and the stationary crack.The stress field at the crack tip is beneficial to crack initiation.After crack initiation, both cracks will be deflected toward the crack surface to form hook-like cracks in the interaction of two moving cracks.
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