衝撃引張応力-ひずみ曲線に及ぼす試験片形状の影響

概要

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The impact tensile tests of spheroidal graphite cast iron were conducted by means of a tensile version of the split Hopkinson bar apparatus. According to the basic principle of the method, the average strain of specimen was calculated using measured displacements at the ends of specimen. Therefore, it is thought that experimental impact tensile stress-strain curve includes the effect of the fillets of tensile specimen. Hence, this stress-strain curve was modified so that the load-displacement curve calculated using the impact elastic-plastic finite element method agrees with the measured load-desplacement curve. The modified stress-strain curve seems to be the correct one of test material. Moreover, the strain distributions of tensile specimen were calculated rsing the impact elastic-plastic finite element method on the basis of the modified impact tensile stress-strain curve.
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