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带损伤孔的复合材料层合板拉伸强度会降低约55%,需要对其进行修理以恢复力学性能、满足使用要求。针对带圆形损伤孔的复合材料层合板设计了机械连接修理方案,通过轴向拉伸试验评估其修理效果。根据试验条件建立了有限元模型,分析不同的修理方案对破坏模式、破坏载荷、应力分布、钉载分配等产生的影响。试验及有限元分析(FEA)均表明,修理后的复合材料层合板,其强度恢复率达到55%~60%左右,应力集中部位主要在修理区域最外侧的钉孔旁,最终破坏模式为母板沿修理区域最外侧一排钉孔断裂。使用双面修理、增加螺栓排数、采用金属补片、适当增加补片厚度,可减缓应力集中,改善钉载分配,提高结构强度恢复率。
Tensile strength of the composite laminates with damaged holes is reduced by about 55% and needs to be repaired to restore mechanical properties to meet the application requirements. A mechanical connection repair scheme was designed for the composite laminates with round damaged holes. The axial tensile test was used to evaluate the repairing effect. Based on the experimental conditions, a finite element model was established to analyze the influence of different repair schemes on failure mode, failure load, stress distribution and nail load distribution. Experimental and finite element analysis (FEA) showed that the repaired composite laminates had a strength recovery rate of about 55% -60%. The stress concentration sites were mainly near the outermost nail holes in the repair area. The final failure mode was mother Board along the repair area of the outermost row of nail holes rupture. The use of double-sided repair, increase the number of rows of bolts, the use of metal patch, patch the appropriate increase in thickness, can reduce stress concentration, improve nail load distribution, improve structural strength recovery rate.