螺纹连接密封胶圈损伤分析

飞机螺纹连接密封胶圈损伤失效，通过外观检查、断口分析、硬度分析、间隙测量等方法，结合密封圈的结构特点和工作受力特性，对密封圈的失效性质、原因及过程进行深入探讨，并探寻预防再失效的改进措施。结果表明:胶圈为间隙咬伤损伤，主要与其硬度偏低及间隙量偏大有关；顶盖倒角边缘设计尺寸低于标准要求，也促使胶圈咬伤；控制间隙量在0.06 mm以内，在保证胶圈其他性能符合要求的条件下适度提高硬度，均可有效防止类似故障的发生。

Damage Analysis of Thread Connection Sealing Ring

Mechanical damage failure occurred to a thread connection seal ring of an aircraft. Through appearance inspection, fracture analysis, hardness testing and clearance measurement, combined with the structural characteristics and working force characteristics, the failure mode, cause and process of the sealing ring were studied in depth, and improvement measures to prevent re-failure were put forward. The results show that the failure mode of the rubber ring is gap bite damage, which was mainly related to its low hardness and large clearance. The design dimension of the chamfered edge of the top cover is smaller than the standard requirements, promoting the bite damage of the rubber ring. Controlling the clearance within 0.06 mm and moderately increasing the hardness under the condition that the other properties of the rubber ring meet the requirements can effectively prevent the occurrence of similar faults.