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首页> 外文期刊>Engineering Fracture Mechanics >Failure investigation of pure titanium bleed air ducts in jet fighters
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Failure investigation of pure titanium bleed air ducts in jet fighters

机译：喷气式战斗机纯钛排气管的故障调查

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This paper describes the failure investigation of in-flight failures of bleed air ducts in jet fighters. Severe rupture had occurred at the bleed air duct during the flight that had caused the emergency landing situation. The tubular duct was manufactured using commercially pure titanium. An inspection revealed that all cracks occurred in the central portion of the bleed air duct. Examination of the fractured surfaces by using electron microscopy revealed that cracks initiated at multiple corrosion pits in the inner surface of the duct and these propagated by brittle cleavage cracking with occasional areas of fatigue striations induced by in-service cyclic pressure. Fractography, chemical analysis, and metallographic analysis confirmed that brittle fracture involved the ingress of hydrogen into a duct surface. The hydrogen effectively decreased the ductility of the duct which contributed to brittle fracture. The final destructive rupture of the duct can be explained by fracture mechanics. The critical crack size and stress induced by conditions at or near the operating load were estimated based on computational fracture analysis to explore the fracture mechanism. As a consequence, a novel nondestructive inspection method has been developed to prevent such failures in future. (C) 2017 Elsevier Ltd. All rights reserved.
机译：本文介绍了喷气式战斗机中出血空气管道飞行失败的故障调查。在造成紧急落地情况的飞行期间出血风管发生严重的破裂。使用商业纯钛制造管状管道。检查显示，所有裂缝发生在排气管道的中央部分。通过使用电子显微镜检查裂缝表面揭示了在管道内表面的多种腐蚀坑中引发的裂缝，这些裂缝通过脆性切割裂缝与偶尔通过在式循环压力诱导的疲劳条纹区域传播。 Fractography，化学分析和金相分析证实，脆性骨折涉及氢气进入管道表面。氢有效地降低了导管的延展性，这导致了脆性骨折。管道的最终破坏性破裂可以通过裂缝力学来解释。通过计算裂缝分析估计操作负荷处或附近的条件或附近的临界裂纹尺寸和应力探讨了裂缝机制。因此，已经开发出一种新的非破坏性检查方法来防止未来的失败。 （c）2017 Elsevier Ltd.保留所有权利。

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