硬質プラスチックの曲げによる降伏

概要

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The yield behavior of polycarbonate and polyvinyl chloride subjected to bending was investigated by uniform bending tests using beams with several kinds of cross section. Particular attention was given to the effect of the macroscopic stress distribution in the specimen on the yield behavior. It has been shown that by observation in tension and compression tests, the yield behavior of rigid plastics can be devided into two distinct processes ; the initiation process of yield accompanying load drop and the progressive process of yield under constant load. This suggests that there are two kinds of yield stresses. Thus, in order to get a general interpretation of yield of plastics, the two kinds of yield stresses should be taken into consideration. The yield behavior in bending has been analysed in terms of two kinds of yield stresses for rigid plastics, and the relation between the bending moment and strain on the surface of beam has been determined quantitatively. The calculated results were confirmed by the experiments.
社団法人日本材料学会の論文
1981-06-15