509 高分子材料の衝撃圧縮応力-ひずみヒステリシス・ループの決定(OS9-2 衝撃と種々の測定法,OS9 実験力学における新たな試み)

概要

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Stress-strain hysteresis loops of several engineering plastics in compression at strain rates of nearly 600/s are determined using the standard split Hopkinson pressure bar. Four plastics or typical thermoplastics PA-6, PA-66, PC and POM are tested at room temperature. Cylindrical specimens with slenderness ratio (= height/diameter) of 0.5 are used in the Hopkinson bar tests, and those with slenderness ratio of 1.5 as specified in the ASTM Standards are used in the static tests. The low and intermediate strain-rate stress-strain hysteresis loops in compression are measured in an Instron testing machine. The effects of strain rate on Young's (or secant) modulus, 2.5% flow stress and dissipation energy (energy loss due to damping) are examined. It is demonstrated that the area within the stress-strain hysteresis loop (or dissipation energy) increases with increasing strain rate as well as strain, that is, all plastics tested exhibit intrinsic dynamic viscoelasticity and a high elastic aftereffect following complete unloading.
一般社団法人日本機械学会の論文
2007-10-24