ELASTIC-VISCOPLASTIC DEFORMATION OF STRIP HAVING ANGULAR-NOTCH WITH CIRCULAR ROOT UNDER COMPRESSION

概要

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Problems concerning the elastic deformation of a strip having an angular notch with a circular root under tension have been investigated by the elastic theory or the photoelasticity, and those concerning its plastic deformation have been analysed in the static equilibrium state by using the conventional plastic theory. In the usual deformation of actual materials, however, the stress distribution and the amount of deformation are affected by the deformation history in the transient period from the instant of loading to that state. Therefore, in order to analyse the actual deformation of real material precisely, the deformation should be investigated with the elastic-viscoplactic theory in which deformation history and time dependence are taken into account. In the present paper, the deformation of a softened celluloid strip having an angular notch with a circular root under constant compressive load is investigated by using the photorheologic method in the period from the instant of loading to the static equilibrium state 300 min after loading. The stress state in the strip is discussed comparing with the existing results in elasticity and the effect of viscoplastic property of real materials in the deformation is emphasized on the stress concentration.
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