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对C/C复合材料在弯曲载荷下的性能进行了试验研究和有限元数值模拟研究。试验中,沿两个加载方向分别测试了C/C复合材料的弯曲性能,绘制了试验件的载荷位移曲线并给出了损坏试验件的微观照片。在有限元模拟中,采用了Linde失效准则来进行模拟,预测了C/C复合材料在垂直于纤维方向上的弯曲强度。有限元模拟结果与试验结果相比,误差为3.56%。最后分析了C/C复合材料在弯曲载荷作用下的损伤破坏机理。C/C复合材料受到弯曲载荷时,发生破坏的主要原因是轴向纤维在拉伸应力下达到强度极限而破坏。纤维损伤主要出现于0度纤维层的中间部分,而基体的损伤分布情况范围较广,主要集中于上表面和试件的中间部分。
The properties of C / C composites under bending load were studied and studied by finite element method. In the test, the bending properties of C / C composites were tested along the two loading directions respectively. The load displacement curve of the test piece was plotted and the microscopic photograph of the damaged test piece was given. In finite element simulation, Linde failure criterion was used to simulate the bending strength of C / C composites in the direction perpendicular to the fiber. The finite element simulation results compared with the experimental results, the error is 3.56%. Finally, the damage mechanism of C / C composites under bending load was analyzed. When C / C composites are subjected to bending load, the main reason for the damage is that the axial fibers break down and reach the ultimate strength under tensile stress. Fiber damage mainly occurred in the middle part of the fiber layer at 0 degree, while the damage distribution of the matrix was in a wide range and mainly concentrated on the upper surface and the middle part of the test piece.