Dynamic Plastic Deformation of a Cantilever Struck Transversely at Its Tip

概要

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In order to study the variation of the strength of mild steel with increased strain rate, we deal with the dynamic plastic bending of a cantilever. The cantilever can be assumed to be made of a rigid-plastic material when plastic deformation is large compared with elastic one. In the model of rapid bending of the beam proposed by Lee and Symonds, entire deformation is assumed to take place at a moving hinge at each instant, and there the shear force to be zero, since the hinge is the point of maximum bending moment. But in the case where the cantilever is struck transversely by a rifle bullet, the assumption that the shear force is zero is not reasonable because the effect of rotary inertia is not negligible. Thus an improved theory considering a certain shear force at the hinge is proposed and some results of experiments and analyses as a basis of our theory are presented.
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