含多源损伤的胶接修补结构有限元分析方法

采用有限元法研究含多源损伤结构的胶接修补问题,利用二维三层有限元模型对损伤区进行了数值模拟,并选取典型多源损伤情况中含共线双裂纹铝板结构为算例,详细分析了含多裂纹胶接修补结构中两裂纹相对位置、补片尺寸、铺层和厚度对应力强度因子的影响.结果表明,复合材料胶接修补可明显降低含共线双裂纹母板的应力强度因子;对于确定的裂纹和应力场,应对复合材料补片长度和厚度等参数进行优化设计,以获得最佳的修补效果.

The Finite Element Analysis Method for Bonded Repair Structures with Multiple Site Damages

The finite element method was used on bonded repair of aluminum plates with multiple sites damages,and a two dimension with three layer model technique was used to deal with the data model of damage area.A typical aluminum plate with collinear twin cracks was taken as an example and the effects of relative position of two cracks,patch size,patch thickness on stress intensive factors were studied.The results reveal that the stress intensive factors at the tips of collinear twin cracks can be reduced greatly through bonded composite repair.In order to increase the performance of patch repair,the patch length and thickness must be optimized.