修复金属板裂纹的复合材料补片正交优化

基于Abaqus软件建立了金属板裂纹复合材料补片修复结构的有限元模型。以应力强度因子(SIF)为判据,利用L9(34)型正交实验考察了各补片参数对修复效果的影响。结果表明:在99%置信度水平下,补片厚度的贡献率为68.77%,铺层顺序的贡献率为29.59%,而补片长度对修复效果的影响不明显。结合工程应用实际与正交分析结果,利用设计好的补片对含中心贯穿裂纹的铝合金板进行了修复,并对修复结构进行了静强度测试。结果表明:修补后静强度为未修复裂纹板的1.32倍,恢复至完好板的97.2%,延伸率为未修复裂纹板的2.24倍,恢复至完好板的50.7%。结论:选用长度为40 mm,厚度为1.2 mm,铺层顺序为0°/90°]s的正方形补片时修补效果最好。

Orthogonal Optimization of Composite Patch for Repair of Cracked Metallic Plate

The finite element model is developed by Abaqus for analyzing the fracture problem of cracked metallic plate repaired with the double-side adhesively bonded composite patches, in which the thermal residual stresses is also contained, and the stress intensify factor(SIF) is used to evaluate the repair effect.Meanwhile, with the help of orthogonal table L₉(3⁴), the parameter of the patches,which influence the repair effect,has also been evaluated. The orthogonal analysis result shows that,in confidence level of 99%, the contribution ratio of lay-up direction and patch thickness are 68.77% and 29.59% respectively.Meanwhile, the influence of patch length is rarely.Moreover,connect the orthogonal analysis result with the applied condition,the patch parameter is elected to repair the cracked metallic plate for the uniaxial tension test.And the test result indicates that the tension intensity of the repaired plate is 1.32 times than cracked plate,and 97.2% of the uncracked one. Meanwhile, the elongation of the repaired plate is 2.24 times than the unrepaired one,and 50.7% of the uncracked one.The repair effect is best when the square patch length is 40 mm, thickness is 1.2 mm and lay-up direction is 0°/90°]_s.