Size effect of Taylor impact plastic deformation

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Journal of Vibration and Shock ›› 2023, Vol. 42 ›› Issue (17) : 86-95.

SHEN Zikai1,2, DAI Xianghui2, WANG Kehui2, QIAN Bingwen2, FAN Ruyu1,2, GAO Pengfei2, KE Ming1,2, ZHOU Gang2

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Abstract

Taylor impact is a typical case of structural impact problem, which can decouple the effect of strain rate on size effect. An analytical model of Taylor bar deformation considering size effect was established. The Taylor impact experiment under different scale was carried out, and the size effect was quantified by direct measurement, three-dimensional scanning and scanning electron microscope microanalysis. The results show that the size effect of plastic deformation during Taylor impact test exists both at macro and micro level. Under the velocity of 200m/s impact, the deviation of dimensionless length variation of Taylor bar at 1/2 size and 3/10 size is -3.75% and -7.25%, respectively. The deformation formula of Taylor bar can describe the size effect of Taylor impact well. The strain rate effect is the main reason for the size effect of Taylor bar plastic deformation. Under the same experimental conditions, the smaller the Taylor bar size, the higher the strain rate, and the smaller the dimensionless plastic deformation.

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Taylor impact test / plastic deformation / strain rate / similarity / size effect

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SHEN Zikai1,2, DAI Xianghui2, WANG Kehui2, QIAN Bingwen2, FAN Ruyu1,2, GAO Pengfei2, KE Ming1,2, ZHOU Gang2. Size effect of Taylor impact plastic deformation[J]. Journal of Vibration and Shock, 2023, 42(17): 86-95

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