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采用材料弹性系数的刚度退化模型分析了复合材料挖补结构的极限强度。基于Mayes模型提出了一种复合材料层合板的刚度退化方法,以带中心孔拉伸试件为对象,在完成有限元网格划分与单元选取的适应性研究后,使用复合材料层压板挖补试验件进行了渐进损伤分析方法的有效性验证。开展了挖补结构的渐进损伤分析和挖补参数对极限强度的影响研究。研究结果表明,采用层合单元的有限元模型和基于材料弹性系数的刚度退化模型,可以作为复合材料修补结构强度的基本分析模型,计算效率和分析精度能够满足工程分析需求,修补设计参数对修补结构强度的影响呈非线性。研究结果可以为复合材料层压板挖补修理设计提供参考。
The ultimate strength of composite structures is analyzed by using the stiffness degradation model of material elastic coefficient. Based on the Mayes model, a method for determining the stiffness degradation of composite laminates is presented. After the finite element meshing and element selection adaptability studies are completed, The validity of the method of progressive damage analysis was verified. The gradual damage analysis of excavation structure and the influence of excavation parameters on the ultimate strength are carried out. The results show that the finite element model of laminated element and the stiffness degradation model based on elastic coefficient of material can be used as the basic analysis model of the composite structure to repair the structural strength. The computational efficiency and analytical precision can meet the engineering analysis requirements and repair the design parameters The effect of structural strength is nonlinear. The results can provide a reference for the design and repair of composite laminates.