Dynamic Buckling of Bars : 3rd Report, In the Case of Elastoplastic Bars

概要

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In this paper, a dynamic buckling problem of elastoplastic columns axially loaded at one end by a moving rigid body is treated, and the experimental results are compared with those calculated from the theory in which a tangent modulus E_t is used both for compression and bending of the column up to the buckling load. When impact velocities of the rigid body are small, the theoretical values agree with the experimental ones. If the kinetic energy of the moving body is kept constant while its mass and velocity are varied, the results obtained from experiments and numerical calculations are as follows: In the case of low impact velocities with large masses, the column buckles more easily and the buckling load is smaller than that of high impact velocities with small masses. This difference appears distinctly when the impact velocity of the body is high but almost disappears when the impact velocity is low.
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