プラスチックボルトの衝撃強度特性について

概要

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In this paper, the impact strengths of the commercially supplied Polyvinylchloride (PVC) bolt and Polycarbonate (PC) bolt are clarified and these strengths are compared with static strengths of them. For PC bolt which maintains ductile rupture under impact tensile load as well as static tensile load, the proof stress under impact load is newly proposed. As the result, the following conclusions are obtained : (1) Although the rupture mode of PVC bolt is ductile under static tensile load, it changes into brittle under impact tensile load and consequently, the rupture energy extremely decreases as compared with that in static tensile load. (2) PC bolt maintains ductile rupture under impact load and its rupture energy is comparable to that under static load. (3) For the PC bolt, if the maximum stress under impact load is below the "Impact Proof Stress" proposed here, the failure of the bolt does not occurred.
1989-04-05