建立含中心半穿透圆孔的损伤金属板修补结构的三维有限元模型,以应力集中系数(Stress Concentration Factor, SCF)和挠度w作为复合材料胶接修复效果的指标,分析单向拉伸条件下,正方形补片的长度、厚度和铺层方式对修复效果的影响.结果表明:补片长度取孔直径的3.5倍、厚度取孔深度的0.6~0.8倍、铺层方式取0°/90°铺层时,复合材料单面修复含损伤裂纹板的效果较好.根据分析结果制备了实验件,进行了单向静拉伸实验,修补实验件的破坏强度比未修补实验件提高了10.1%.
A three-dimensional finite element model of the repaired structure was established, by which the impact of patch parameters on effect of one-side boned repaired structure under uniaxial tensile loading was analyzed based on the stress concentration factor (SCF) and deflection.The results show that the repair effect is better when the crack length is 3.5 times of the hole diameter, the thickness is 60% to 80% of the hole depth and the lay-up is 0°/90°.Then the finite element results were subjected to the uniaxial tension tests.The failure strength of the repaired plate increases by 10.1% compared with that of the unrepaired plate.
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