CFRP修复港口起重机箱形结构疲劳裂纹的数值仿真及实验研究

箱形结构是港口起重机的主要结构形式之一。其长期承受疲劳交变载荷,容易诱导裂纹扩展,最终导致疲劳断裂失效,严重威胁人类财产安全和经济效益。文中应用碳纤维增强复合材料(CFRP)对箱形结构上的疲劳裂纹进行修复,通过数值仿真计算裂纹尖端应力强度因子,结合Paris公式计算裂纹扩展的速率,随后通过疲劳载荷下裂纹扩展实验对仿真结果进行验证。结果表明,CFRP修复能够显著降低箱形结构上的裂纹扩展速率,延长其使用寿命。

Numerical simulation and experimental study on repairing fatigue crack of port crane chassis structure with CFRP

The chassis structure is one of main structures of port cranes and tend to cause crack growth due to a long time of suffering from fatigue alternating load, which will impose seriously threatens on the safety of human property and economic benefits. In the paper, carbon fiber reinforced polymer (CFRP) is used to repair fatigue cracks on the chassis structure. The stress intensity factor at the crack tip is calculated by numerical simulation, and the crack growth rate is calculated by combining Paris formula. Then the simulation results are verified by crack growth experiments under fatigue load. Results show that the repair with CFRP can reduce the crack growth rate significantly on the chassis structure and extend the service life.