ARALL 材料拉伸力学性能的试验研究

利用自行研制的旋转盘式间接杆杆型冲击拉伸试验装置对ＡＲＡＬＬ材料以及施加预应力的ＡＲＡＬＬ材料进行了３个应变率（２００、５００、１３００ｓ－１）的冲击拉伸试验，得到了两种材料在不同应变率下的完整的应力应变曲线。结果表明ＡＲＡＬＬ材料在高速加载条件下的变形可以分为弹性变形、塑性变形和材料失稳后的残余变形三个部分，每个部分都有不同的变形机理。结果还表明，随着应变率的增加两种材料的屈服应力、失稳应力以及失稳应变均相应增加，表现出明显的应变率强化和动态韧性现象。最后根据材料在不同应变率下的试验结果，建立了ＡＲＡＬＬ材料计及应变率影响的三段线性本构模型。

EXPERIMENTAL STUDY OF ARALL UNDER TENSILE IMPACT

In this paper,using our design of bar bar tensile impact apparatus,we performed an experimental study of ARALL and ARALL(prestress)in the strain rate range from 200s -1 to 1300s -1 .The complete stress strain curves of composite under tensile impact was obtained.Result shows that the deformation of ARALL at high strain rate consists of three parts:elastical deformation,plastical deformation and remaining deformation.Result also shows that yeilding stress,failure stress and failure strain are all sensitive to strain rate.On basis of our experiment of the composite under different strain rates we derives a one dimensional constitutive equation for the composite under tensile impact.