| 摆振限动块安装螺栓断裂原因分析 |
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| 引用本文： | 白红超,黄景兴,陈尧.摆振限动块安装螺栓断裂原因分析[J].失效分析与预防,2022,17(2):119-123, 128. |
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| 作者姓名： | 白红超 黄景兴 陈尧 |
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| 作者单位： | 1.昌河飞机工业（集团）有限责任公司，江西 景德镇 333002 |
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| 摘 要： | 针对直升机摆振限动块安装螺栓在服役过程中发生断裂的现象，主要从工艺角度分析了螺栓断裂的原因。通过断口宏微观观察、化学成分分析及硬度测试，核查了断裂螺栓的热处理工艺参数。在此基础上，利用螺栓拧紧力矩、拉伸和冲击韧性试验验证螺栓失效原因。结果表明，螺栓断裂是由于热处理工艺不当，导致其具有回火脆性。针对该螺栓断裂问题，通过降低回火温度来改善其回火脆性，从而降低飞行过程中摆振限动块受到桨叶对螺栓的冲击力导致的断裂风险，保障直升机的安全运营。
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| 关 键 词： | 摆振限动块 螺栓 断裂 回火脆性 |
| 收稿时间： | 2021-11-30 |
Fracture Analysis of Setting Bolt for Shimmy Stopper |
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| BAI Hong-chao,HUANG Jing-xing,CHEN Yao.Fracture Analysis of Setting Bolt for Shimmy Stopper[J].Failure Analysis and Prevention,2022,17(2):119-123, 128. |
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| Authors: | BAI Hong-chao HUANG Jing-xing CHEN Yao |
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| Abstract: | In allusion to the phenomenon that the setting bolt of a helicopter shimmy stopper is prone to fracture during service, the reason for the bolt fracture is analyzed in this paper. The heat treatment process parameters for the fractured bolt were verified by macroscopic and microscopic observation of the fracture, chemical composition analysis and hardness test. And on this basis, the bolt tightening torque, the tensile, and the impact toughness tests were used to ascertain the cause of the failure of the bolt helicopter shimmy stopper. The results show that bolt fracture is the tempering brittleness caused by the improper heat-treatment process. To solve the bolt failure problem, a method for improving the tempering brittleness is proposed in this paper. The decrease in tempering temperatures is expected to reduce the fracture risk of the shimmy stopper caused by the impact of the blade on the bolt during flight and ensure the safety of the helicopter operations. |
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