Transverse compression tests on a unidirectional composite were performed under quasi-static and high-rate loading conditions using servo-hydraulic machines as well as a direct impact Hopkinson bar. Aside the expected increase of compressive strength with increasing loading rate, a change of fracture plane orientation was observed. For quasi-static loading conditions, the fracture angle was 54.5°, for high rate-loading conditions this increased to 65°. Assuming a Mohr-Coulomb type of fracture for unidirectional composites under transverse compression loading, the change of fracture plane orientation indicates a rate dependency of the internal friction angle $\varphi$, which has not previously been reported for composite materials.

使用伺服液压机以及直接冲击的霍普金森杆在准静态和高载荷条件下对单向复合材料进行了横向压缩测试。除了预期的抗压强度随加载速率的增加外，还观察到断裂面取向的变化。对于准静态载荷条件，断裂角为54.5°，对于高倍率载荷条件，断裂角增加至65°。假设单向复合材料在横向压缩载荷下为Mohr-Coulomb型断裂，则断裂面取向的变化表明内摩擦角与速率的关系$\varphi$，以前没有关于复合材料的报道。