酚醛层压材料的本构模型研究

摘要

文中讨论了雷管生产线中使用的酚醛层压材料的本构模型,使用分离式Hopkinson压杆(SHPB)研究了材料在高应变率下的力学行为.通过对实验结果的分析,材料的动态应力—应变曲线符合ZWT(朱王唐)非线性热弹粘性本构模型.利用最小二乘法拟合了方程参数,同时对拟合的理论结果与实验结果进行比较,发现在低应变区,拟合并不很好,试件内存在应力应变分布不均的影响因素；在高应变区,拟合与实验结果比较吻合.%The constitutive model of phenolic cotton fabric material which is used in the detonator production lines was discussed and its dynamic behaviors were studied at high strain rates by using the split Hopkinson pressure bar in present study. Experimental data analysis shows that its dynamic strain-stress curves are consistent with ZWT ( Zhu-Wang-Tang) non-linear visco-elastic constitutive model. ZWT equation parameters were obtained by the least square method. In comparison with the experimental results, the fitted theoretical results are not so good at low strain rates due to the existence of uneven stress and strain distribution within the test specimens but quite well at high strain rates.