论文部分内容阅读
针对复合功能布的物理特性,利用材料试验机和分离式Hopkinson压杆装置,展开了准静态和动态条件下单层和双层复合功能布材料的单轴抗压实验,获得了两种材料在不同应变率下的应力应变曲线和材料的失效应力、应变.实验结果表明:复合功能布的动态失效强度明显高于准静态失效强度,而且随着应变率的增加其动态失效强度呈现增加的趋势,即该材料具有明显的应变率硬化效应.对应力应变曲线进行拟合,给出了材料的动静态粘弹性本构关系.并对复合功能布在不同应变率下的失效应变及材料的损伤结果进行了初步的分析.
According to the physical properties of the composite functional fabrics, uniaxial compressive experiments of single-layer and double-layer composite functional fabrics under quasi-static and dynamic conditions were carried out by using a material testing machine and a split Hopkinson pressure bar apparatus. Two kinds of materials The stress-strain curves at different strain rates and the failure stresses and strains of the materials.The experimental results show that the dynamic failure strength of the composite functional fabrics is obviously higher than that of the quasi-static failure strength, and the dynamic failure strength increases with the increase of the strain rate , That is, the material has obvious strain rate hardening effect.Finally, the dynamic and static viscoelastic constitutive relations of the material are given by fitting the stress-strain curve, and the failure strain and material damage of the composite functional cloth at different strain rates The results of a preliminary analysis.