选择两种铺设方式([(45/-45)4]s和[(o/45/90/-45)2]s)的T300/Epoxy(炭纤维/环氧树脂)层合板,利用MTS试验机以及Hopkinson拉伸杆分别对其进行了准静态拉伸试验(应变率为10-5～10-4s-1)、中应变率拉伸试验(应变率为10°～101s-1)和高速冲击拉伸试验(应变率为102～104s-1).静态、动态实验的试件形状及尺寸均相同.获得了不同应变率加载条件下T300/Epoxy的应力-应变曲线.基于所获得的应力-应变曲线,讨论了应变率对炭纤维增强复合材料力学性能的影响.研究结果表明:复合材料T300/Epoxy是应变率相关的材料;层合板的铺设方向对其应变率效应有着显著的影响;随着应变率的增加,材料的强度及弹性模量有较大程度的提高,但破坏应变有所降低.通过对试验结果的数据拟合,提出了材料应变率相关的动态本构模型.
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