【摘要】 选择两种铺设方式([(45/-45)4]S和[(0/45/90/-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100~101s-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。更多还原

【Abstract】 The strain rate dependent behavior of T300 carbon/epoxy matrix composite in tension was studied by testing two kinds of laminates [(45/-45)4]S and [(0/45/90/-45)2]S at different rates.The tensile test was carried out on an MTS machine at the quasi-static strain rates of approximately 10-5～10-4 s-1 and the intermediate strain rates of about 100～101s-1.The tensile high strain rate test was conducted with the tensile split Hopkinson bar technique at strain rates of approximately 102～104 s-1.The specimens with identical geometry were used in all the tests.The dynamic stress-strain plot was obtained and compared with the quasi-static tensile test result.The results of the study indicate that Carbon/Epoxy composites are strain rate dependent materials.The stacking sequence has a significant effect on the material response.The tensile strength of the composites increases with increasing the strain rate,and the failure strain decreases when the strain rate increases.A constitutive model for characterizing the strain rate dependent behavior of T300/Epoxy composites was derived by simulating the experimental data.更多还原