三维编织复合材料胶接接头力学性能试验研究

为了比较三维编织复合材料阶梯型和嵌套式搭接接头的胶接修复效果,对搭接长度相同的两种接头进行了拉伸和弯曲力学性能研究。通过实验得到两种接头及完好试件的载荷-位移曲线,对比了修补后的试件强度与完好试件的强度,得到了接头试件的修复效率,并分析和总结了拉伸与弯曲试验试件的损伤过程及损伤形貌。实验结果显示:阶梯型胶接接头拉伸载荷作用下的修复率为37.75%,弯曲载荷作用下的修复率为66.25%;嵌套式胶接接头拉伸载荷作用下的修复率为18.97%,弯曲载荷作用下的修复率为21.44%。对比试验结果得出阶梯型胶接接头力学性能较好。

THE MECHANICAL PROPERTIES OF 3D BRAID COMPOSITE ADHESIVE JOINTS

In order to compare the efficiency of 3D braid composite repair of different type joints,the mechanical properties of step lap joint and nested joint subjected to tensile and bending load were examined experimentally by keeping the same joint length for all samples.Load-displacement curves were obtained for each type of joint by the test.Then,the strength of samples and the repair efficiency were acquired by comparing the strength of joints with intact specimens.Meanwhile,the tensile and bending damage evolution and profiles of specimens were analyzed and summarized.The test results show that the step lap joint has better mechanical properties.The repair efficiency of step lap joint under tensile load was 37.75％,and under bending load,the repair efficiency was 66.25％.The repair efficiency of nested joint under tensile load can reach 18.97％,and under bending load,the repair efficiency can reach 21.44％.