Zhang Yanfeng, Zhou Zhengong, Tan Zhiyong
National Key Laboratory of Science and Technology on Advanced Composites in Special Environments, Harbin Institute of Technology, Harbin 150080, China.
Beijing Institute of Near-space Vehicle's System Engineering, Beijing 100076, China.
Materials (Basel). 2019 Sep 10;12(18):2922. doi: 10.3390/ma12182922.
The loading and the failure mode of metal hexagon bolt joints and metal counter-sunk bolt joints of C/C composites were investigated. The joints were tested for out-of-plane loading at two temperatures (600 °C and 800 °C). The failure morphology of a lap plate was investigated, and the main failure modes were determined. The typical load-displacement curve was characterized and the test was simulated using ABAQUS non-linear finite element software. Furthermore, progressive damage was induced, and comparison of the finite element simulation with the experimental data revealed that the failures mainly occurred in the lower lap plate and were dominated by cracking and delamination of the matrix, accompanied by the pull-out of a small number of piercing fibers. Finally, the influences of the temperature, nut radius, and fixture geometry on the critical load were determined via simulation.
研究了C/C复合材料金属六角螺栓接头和金属沉头螺栓接头的加载及失效模式。在两个温度（600℃和800℃）下对接头进行了面外加载测试。研究了搭接板的失效形态，并确定了主要失效模式。对典型的载荷-位移曲线进行了表征，并使用ABAQUS非线性有限元软件对试验进行了模拟。此外，引发了渐进性损伤，有限元模拟与实验数据的比较表明，失效主要发生在下部搭接板，主要由基体的开裂和分层主导，伴有少量穿刺纤维的拔出。最后，通过模拟确定了温度、螺母半径和夹具几何形状对临界载荷的影响。
