The present study experimentally investigates the mechanical response of T700/M21 Carbon Fibre Reinforced Polymers subjected to coupled shear and transverse tension at intermediate strain rates ranging from 10⁻³ to 15 s⁻¹. Off-axis tension specimens with transverse and oblique tabs are used for the various tests. Moreover, the specimen aspect ratio is quite low, since dynamic tests are performed in this study. The axial stress–strain curves are successfully simulated using finite element simulations with a viscoelastic model. Based on these numerical simulations, specific stress correction factors are computed to take the effect of end constraints into account for such low aspect ratio specimens. Finally, an increase in the material strength with the strain rate is observed.

中文翻译：

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应变率对复合材料失效影响的实验研究，在单向层片上进行离轴拉伸试验

本研究通过实验研究了T700/M21 碳纤维增强聚合物在10 ^-3到15 s ^-1范围内的中间应变率下经受耦合剪切和横向张力的机械响应。带有横向和倾斜凸片的离轴拉伸试样用于各种测试。此外，样本纵横比非常低，因为在本研究中进行了动态测试。使用具有粘弹性模型的有限元模拟成功地模拟了轴向应力-应变曲线。基于这些数值模拟，计算特定的应力校正因子，以考虑到这种低纵横比试样的端部约束的影响。最后，观察到材料强度随应变速率的增加。