某型飞机液压泵安装座螺栓断裂失效分析

目的探究某型飞机液压泵安装座固定螺栓断裂原因。方法通过观察多组螺栓的断口形貌,以及对其进行力学性能测试和材料组织分析。结果螺栓断口边缘无明显的腐蚀氧化特征,有较为明显的氢脆断裂断面特征,螺栓的硬度均超过标准,并未发现有害的夹杂物和磷化物。结论螺栓在制造时可能存在缺陷,硬度超标和除氢不完全是造成断裂的主要原因。并根据分析结果对生产商提出相关建议和检查方向。

Fracture Failure Analysis of Hydraulic Pump Mounting Seat Bolt for a Certain Type of Aircraft

Objective To find out the cause for fracture of fixed bolt on the mounting seat of a hydraulic pump for a certain aircraft. Methods The fracture morphology of multiple groups of bolts was observed. Mechanical performance testing and material organization analysis were carried out. Results There were no obvious corrosion and oxidation characteristics at the break edge of the bolt, and there were more obvious features of hydrogen brittle fracture sections. The hardness of the bolts exceeded the standard and no harmful inclusions and phosphates were found. Conclusion Bolts may have defects at the time of manufacture. Excessive hardness and dehydrogenation are the main causes of fracture. According to the results of the analysis, relevant suggestions and inspection directions are put forward.