【摘要】 起重机金属结构在长期服役过程中易产生疲劳裂纹,使用止裂孔与碳纤维复合材料(CFRP)对含疲劳裂纹的金属结构进行复合修复能获得比单一修复方式更好的效果。针对复合修复后止裂孔边缘裂纹萌生阶段,使用Abaqus与Fe-Safe建立有限元分析模型,分析了加固方式、止裂孔半径、疲劳裂纹长度及裂纹尖端到止裂孔边缘的距离等因素对裂纹萌生寿命的影响,并通过试验进行了验证。结果表明,利用Abaqus与Fe-Safe对复合修复后的结构进行耐久性分析具有可行性,能够为制定修复方案提供参考。更多还原

【Abstract】 For crane metal constructions,fatigue cracks during long-term services easily occurs. A combination of crack stop-hole and CFRP for repairing cracked metal structures can achieve better results than single repairing methods. For the crack initiation stage of the crack stop-hole edge after composite repair,by utilizing ABAQUS and FE-SAFE to establish a finite element analysis model,the influence of factors such as the reinforcement method,the radius of the stop-hole,the length of the fatigue crack and the distance from the crack tip to the edge of the crack stop on the crack initiation life were analyzed and verified through experiments. The results show that it is feasible to use ABAQUS and FE-SAFE to analyze the durability of the composite repaired structure,which can provide references for the formulation of plans to repair.更多还原