汽车后桥半轴疲劳失效

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汽车后桥半轴疲劳失效(中文5000字,英文3000字)
摘要
本文进行了使用中的汽车发生事故时后轴的故障分析。把车轴破坏分成两部分。调查是为了确定事故的原因或结果。对失效的轴杆进行评估以评估其失效，完整性包括视觉检查，照片文件，化学分析，显微硬度测量，拉伸测试和金相检验。借助于扫描电子显微镜检查破坏区域。配备荧光分析设施。结果表明，由于焊接不当，导致轴轴反向弯曲疲劳断裂。
关键词：轴;反向弯曲疲劳;焊接;故障分析

Fatigue failure of a rear axle shaft of an automobile
Abstract
This paper describes the failure analysis of a rear axle shaft used in an automobile which had been involved in an acci-dent. The axle shaft was found to break into two pieces. The investigation was carried out in order to establish whether the failure was the cause or a consequence of the accident. An evaluation of the failed axle shaft was undertaken to assess its integrity that included a visual examination, photo documentation, chemical analysis, micro-hardness measurement, ten-sile testing, and metallographic examination. The failure zones were examined with the help of a scanning electron micro-scope equipped with EDX facility. Results indicate that the axle shaft fractured in reversed bending fatigue as a result of improper welding.
2005 Elsevier Ltd. All rights reserved.
Keywords: Axle shaft; Reversed bending fatigue; Welding; Failure analysis