四步法三维编织复合材料的动态拉伸性能

为研究四步法三维玻璃纤维/环氧编织复合材料在不同应变率下的拉伸破坏模式,对四步法三维玻璃纤维/环氧编织复合材料在准静态和高应变率载荷下的单向拉伸性能进行了测试。运用间接分离式Hopkinson拉杆(SHTB杆)测试了应变率在800~2 100 s-1范围内单轴向上的拉伸性能,同时测试了材料在准静态下的力学性能,并与高应变率下的力学性能做比较。结果表明:四步法三维玻璃纤维/环氧编织复合材料是应变率敏感材料;随着应变率的增加,其拉伸模量和最大应力都增加,而相应最大应力的应变则减小。

Dynamic tensile behavior of 4-step 3-D braided fabric composites

The uniaxial tensile properties of 4-step 3-D braided fabric E-Glass/epoxy composites at quasi-static and high strain rates loadings have been investigated to evaluate the tensile failure mode at different strain rates.The uniaxial tensile properties at high strain rates from 800 to 2 100 s-1were tested using the split Hopkinson tension bar(SHTB) technique.Tensile properties at quasi-static strain rate were also tested and compared with those in high strain rates.The results indicate that the stress strain curves are rate sensitive,and tensile modulus,maximum tensile stress and corresponding tensile strain are also sensitive to the strain rate.The tensile modulus,maximum tensile stress of 4-step 3-D braided fabric E-Glass/epoxy composites is linearly increased with the strain rate.With increasing of the strain rate,the tensile failure of the 4-step 3-D braided fabric E-Glass/epoxy composite specimens has a tendency of transition from ductile failure to brittle failure.