三维机织芳纶／环氧复合材料应变率压缩响应研究

研究三维机织芳纶/环氧复合材料在高应变率下的压缩力学性能.运用分离式霍普金森杆(SHPB)测试不同应变率在复合材料厚度方向的压缩性能,同时对材料在准静态情况的力学性能进行测试,与高应变率下的力学性能比较表明,三维机织芳纶/环氧机织复合材料是应变率敏感材料,随着应变率的增加,压缩刚度和最大应力增加,而相应最大应力的应变则减小.

Compressive Behavior of 3-D Kevlar/Epoxy Woven Composites at Various Strain Rates

The compressive properties of 3-D Kevlar/epoxy woven composites at quasi-static and high strain rate loadings were investigated to evaluate the compressive failure mode at different strain rate.The through-thickness compressive properties at high strain rates were tested using the split Hopkinson bar(SHPB) technique.The compressive properties at quasi-static strain rate were also tested and compared with those at high strain rates.The results indicate that the stress-strain curves are rate sensitive and compressive stiffness,maximum compressive stress of the 3-D Kevlar/epoxy woven composites linearly increase with the strain rate.The compressive failure of the composites specimen tends to be in shear failure mode and it is completely broken at high strain rates while only compressive deformation can be observed in quasi-static loading.