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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。
Based on Abaqus software, a finite element model of the composite structure repair of metal plate crack was established. Based on the stress intensity factor (SIF), the effect of patch parameters on the repair effect was investigated by orthogonal experiment L9 (34). The results show that under the condition of 99% confidence level, the contribution rate of patch thickness is 68.77%, and the contribution rate of lay order is 29.59%. However, the effect of patch length on repair effect is insignificant. Combined with practical and orthogonal engineering application, the repaired aluminum alloy plate with central through crack was repaired with the designed patch, and the static strength of the repaired structure was tested. The results showed that the static strength after repairing was 1.32 times that of the uncoated cracked plate, restored to 97.2% of the intact plate, and the elongation was 2.24 times that of the uncoated cracked plate and returned to 50.7% of the intact plate. CONCLUSIONS: The patch repair works best when using square patches 40 mm in length and 1.2 mm in thickness with [0 ° / 90 °] s ply order.