Abstract

Shear strength evaluation in composites is still a problem that has not been fully solved. Dynamic shear strength evaluation is even more complicated. In present work, failure theories are used to determine the range of fiber orientations in which the evaluation of shear strength is feasible. The symmetrical laminate is used to eliminate coupled shear strain to improve measurement accuracy. Three different fiber orientation laminates are chosen for quasi-static tension test. And a combination of experimental and numerical method is carried out for high strain rate tests. The results show that the fiber orientation of ± 15° is suitable for evaluating the dynamic shear strength of CFRP (Carbon Fiber Reinforced Polymer). This study is of great significance to dynamic shear strength evaluation method of continuous fiber reinforced composites considering strain rate effect.

摘要

复合材料的剪切强度评估仍然是一个尚未完全解决的问题。动态抗剪强度评估甚至更加复杂。在目前的工作中，使用破坏理论来确定在其中剪切强度评估可行的纤维取向范围。对称层压板用于消除耦合剪切应变，从而提高测量精度。选择了三种不同的纤维取向层压板用于准静态拉伸测试。并结合了实验方法和数值方法进行了高应变率测试。结果表明，±15°的纤维取向适合于评估CFRP（碳纤维增强聚合物）的动态剪切强度。