某型飞机加强翼肋组件裂纹失效分析

Failure Analysis of Crack on Aircraft's Strengthened Wing Rib Component

通过化学成分分析、金相组织检测、硬度检测、断口形貌分析以及工况分析,对某型飞机加强翼肋组件裂纹的失效原因进行分析。结果表明,加强翼肋组件制造质量正常无缺陷,由于其结构设计不当,导致在冲击载荷作用下工作应力过大而发生低周疲劳断裂。

The failure analysis of crack on a certain type of aircraft＇s strengthened wing rib components were accomplished based on chemical composition analysis, metallographic examination, hardness testing, fracture morphology analysis and performance analysis. The results show that the manufacturing quality of the strengthened wing rib component is normal without defect. Low cycle fatigue fracture on the strengthened wing rib components appears because the structural design is undeserved and it causes too big impact load stress.