平纹机织玄武岩纤维/环氧树脂复合材料冲击拉伸行为

Impact Tensile Behaviors of Plain Woven Basalt/epoxy Composite

以常规机织工艺生产织物增强体,以真空辅助树脂转移模塑法(VARTM)制备成型复合材料,研究单层平纹玄武岩长丝增强环氧树脂复合材料在准静态和高应变率加载下的拉伸性能。准静态和高应变率拉伸试验分别在MTS-810.23试验仪和分离式霍普金森拉杆(SHTB)测试系统上完成。试验结果表明该材料的力学性能具有应变率依赖性:随着应变速率的增加,拉伸模量和拉伸强度单调增加,失效应变单调减小,弹性能先增加后减小。材料的失效破坏特征也呈现明显的应变率效应:准静态拉伸时,材料断口整齐,树脂的破碎少,几乎没有纤维的抽拔和经纬向纤维束间的滑移;高应变率拉伸时,材料断口参差错乱,树脂完全破碎,纤维束抽拔严重、相互崩裂和滑移,织物增强体结构的整体性破坏严重。

This paper was to investigate the tensile behavior of the single-layer plain woven basalt/epoxy composites under quasi-static and high strain rate loading.The samples were manufactured by the conventional weaving process and cured by the Vacuum Assisted Resin Transfer Molding （ VARTM） process.The tests were conducted by MTS-810.23 and the split Hopkinson tension bar （ SHTB） system,respectively.All the mechanical properties were proved to be strain-rate dependent.The tensile modulus and tensile strength increased monotonously with the increase in the strain rate.The failure strain decreased monotonously with the increase in the strain rate.The resilient energy increased firstly and then decreased with the increase in the strain rate.And the strain-rate effect was also embodied in failure and damage characteristic obvi-ously.In quasi-static tensile,the fractorgraphy was flat with slight resin fracture,little pull-out fiber and little slippage be-tween warp and weft.While in high strain-rate tensile,the fractorgraphy was ragged with complete resin fracture,substantial pull-out fiber,serious slippage between warp and weft and the nonexistent integrity of the fabric reinforcement.