钢/聚氨酯夹层结构动态压缩力学性能与本构模型研究

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振动与冲击 ›› 2016, Vol. 35 ›› Issue (10) : 115-119.

论文

沈超明叶仁传田阿利

作者信息 +

Experimental Study on Dynamic Compressive Mechanical Properties and Constitutive Model of Steel/polyurethane Sandwich structure

SHEN Chao-ming YE Ren-chuan TIAN A-li

Author information +

文章历史 +

摘要

基于霍普金森压杆(SHPB)装置，对高应变率下的钢/聚氨酯夹层结构进行了动态压缩实验，通过不同厚度比的试样比较，建立了夹层结构的动态本构模型。实验结果表明，钢/聚氨酯夹层结构对应变率较为敏感，其屈服强度随应变率的增大而增大，且屈服强度的增幅随应变率的提高会有一定幅度的上升。基于Johnson-Cook模型，考虑厚度比对结果的影响，建立适用于钢/聚氨酯夹层结构的动态本构模型，并通过试验分析，确定了模型参数。利用实测应力应变曲线拟合的方法得到的钢/聚氨酯夹层结构的动态压缩本构模型，能描述不同厚度比的钢/聚氨酯夹层结构在高应变率下的应力应变关系，具有较高的精度。

Abstract

Dynamic compressive constitutive model of steel/polyurethane sandwich structure with different thickness ratio under high strain rate is proposed based on the split Hopkinson pressure bar (SHPB) experimental tests. As the experimental results show, steel/polyurethane sandwich structure is very sensitive to strain rate. The yield strength of steel/polyurethane sandwich structure is increased as the strain rates are raised and the growth rate is greater than the increase speed of strain rate. Based on Johnson-Cook constitutive model, dynamic constitutive model for steel/polyurethane sandwich structure with different thickness ratio was proposed. The parameters in constitutive model are determined by analysis of experimental tests. It can be conclude that the dynamic compressive constitutive model presented in this paper is effective and accurate to descript the stress-strain curve of steel/polyurethane sandwich structure.

导出引用

沈超明叶仁传田阿利. 钢/聚氨酯夹层结构动态压缩力学性能与本构模型研究[J]. 振动与冲击, 2016, 35(10): 115-119

SHEN Chao-ming YE Ren-chuan TIAN A-li. Experimental Study on Dynamic Compressive Mechanical Properties and Constitutive Model of Steel/polyurethane Sandwich structure[J]. Journal of Vibration and Shock, 2016, 35(10): 115-119

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