PBX代用材料非线性粘弹性本构模型研究

Study on Nonlinear Viscoelastic Constitutive Model of Polymer-Bonded Explosive Mock Materials

对某PBX代用材料进行了不同温度和应变率的霍普金森压杆压缩实验,得到了PBX代用材料不同的压缩应力应变曲线,分析了破坏应变、破坏强度和模量随实验温度和应变率的变化规律。通过对PBX代用材料在不同温度和应变率下力学性能的研究,建立了含温度和应变率效应的非线性粘弹性损伤本构方程,能较好的描述PBX代用材料在弹性阶段和强化阶段的力学响应,并且有较好的应用性。

The stress-strain curves of Polymer-bonded explosive(PBX)mock materials under varying experimental temperatures and loading strain rates were measured using split Hopkinson pressure bar(SHPB).The varying characteristics of failure strain,strength and elastic modulus of PBX were analyzed.The nonlinear viscoelastic constitutive model including damage of PBX mock materials was obtained,which can well describe the temperature and strain rate effects on dynamic stress-strain curves.The stress-strain plots of PBX mock materials under different temperatures and strain rates were numerical obtained using this constitutive model.The results show that it can be used to describe the dynamic mechanical behavior of explosives under elastic stage and yielding strength stage.