Taylor撞击塑性变形的尺寸效应研究

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振动与冲击 ›› 2023, Vol. 42 ›› Issue (17) : 86-95.

论文

Taylor撞击塑性变形的尺寸效应研究

沈子楷1,2，戴湘晖2，王可慧2，钱秉文2，范如玉1,2，高鹏飞2，柯明1,2，周刚2

作者信息 +

Size effect of Taylor impact plastic deformation

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

Author information +

文章历史 +

摘要

Taylor撞击是结构冲击问题的一种典型情况，能够将应变率对尺寸效应的影响进行解耦。建立了考虑尺寸效应的Taylor杆变形理论解析模型，开展了系统的不同缩比尺寸下的Taylor撞击实验，结合直接测量、三维扫描和扫描电子显微镜微观分析，对Taylor撞击过程中的尺寸效应进行了量化表征。结果表明：在宏观和微观上Taylor撞击塑性变形均存在尺寸效应，200m/s撞击速度下，1/2缩比、3/10缩比尺寸的Taylor杆无量纲长度变化量与原型实验的偏差分别为-3.75%、-7.25%，获得的Taylor杆变形公式能够很好地描述Taylor撞击实验的尺寸效应。应变率效应是导致Taylor撞击塑性变形尺寸效应的主要原因，在相同实验条件下，Taylor杆尺寸越小，应变率越高，无量纲塑性变形越小。

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.

导出引用

沈子楷1,2，戴湘晖2，王可慧2，钱秉文2，范如玉1,2，高鹏飞2，柯明1,2，周刚2. Taylor撞击塑性变形的尺寸效应研究[J]. 振动与冲击, 2023, 42(17): 86-95

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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