基于整形器的UHPC材料SHPB试验数值模拟与分析

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振动与冲击 ›› 2019, Vol. 38 ›› Issue (21) : 44-52.

论文

任亮 1，2 ，何瑜 1，王凯 1

作者信息 +

Numerical simulation and analysis of SHPB test for UHPC material based on shaper

REN Liang1，2，HE Yu1，WANG Kai1

Author information +

文章历史 +

摘要

为探讨UHPC材料在SHPB试验中实现恒应变率加载和试件应力平衡的途径，采用大型有限元分析软件LS-DYNA从整形器材料、直径以及厚度等角度出发，开展了相应的数值模拟与分析。通过对软件中KCC损伤模型材料参数取值进行优化，拟合了UHPC材料动态损伤行为，建立了基于SHPB技术的UHPC材料冲击压缩数值模型并与实验验证。在此基础上，开展不同整形器材料、厚度和直径下的参数分析，探讨其对SHPB实验中恒应变率加载和试件应力平衡的影响。结果表明: (1) 整形器是实现恒应变率加载和试件应力平衡的有效途径；(2) 相对于铜质整形器，铝质整形器能获得的更小的恒应变率因子(Constant Strain Rate Factor，CSRF)值，能更好的实现恒定应变率加载；(3) 整形器直径增大到一定的程度，入射波将偏离一维应力波传播，建议整形器直径不宜大于杆件直径的0.4倍；(4) 为平衡加载过程中CSRF值和入射波强度，建议整形器长径比不宜大于0.2。

Abstract

To explore the means to realize constant strain rate loading and specimen stress equilibrium in SHPB tests for UHPC material, numerical simulation and analysis using the finite element software LS-DYNA were performed through varying material, diameter and thickness of shaper.The dynamic damage behavior of UHPC material was fitted through optimizing material parameters of the KCC damage model in LS-DYNA.An impact compression numerical model for UHPC material based on SHPB technique was established and verified with tests.Finally, the effects of shaper’s material, thickness and diameter on constant strain rate loading and specimen stress equilibrium in SHPB tests were studied.The results showed that the shaper is an effective means to realize constant strain rate loading and specimen stress equilibrium; the smaller constant strain rate factor (CSRF) can be obtained using an aluminum shaper compared with using a copper shaper to better realize constant strain rate loading; when the shaper diameter increases to a certain level, incident wave propagation deviates from one-dimensional stress wave, so the diameter of the shaper should not be larger than 0.4 times the rod diameter; to balance CSRF value and incident wave strength in loading process, the ratio of length to diameter of the shaper should not be larger than 0.2.

导出引用

任亮 1，2,何瑜 1，王凯 1. 基于整形器的UHPC材料SHPB试验数值模拟与分析[J]. 振动与冲击, 2019, 38(21): 44-52

REN Liang1，2，HE Yu1，WANG Kai1. Numerical simulation and analysis of SHPB test for UHPC material based on shaper[J]. Journal of Vibration and Shock, 2019, 38(21): 44-52

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