CAJ | 학술논문

汽车焊接桥壳在台架试验中发生早期断裂。对桥壳的开裂位置、断口的宏微观特征进行观察分析，对桥壳材料的化学成分、硬度和金相组织进行了测试和分析，结合有限元模拟方法，分析桥壳受力。结果表明：断裂发生在下板托焊缝端部，断口呈现明显的疲劳特征；造成断裂的主要原因是板托焊缝端部的应力水平较高，以及焊缝存在未焊透缺陷加剧应力集中，名义应力较大，诱发了疲劳疲劳裂纹源的萌生，提出了提升焊接质量、优化桥壳附件设计等措施，对延长桥壳的疲劳寿命具有指导意义。
기차한접교각재태가시험중발생조기단렬。대교각적개렬위치、단구적굉미관특정진행관찰분석，대교각재료적화학성분、경도화금상조직진행료측시화분석，결합유한원모의방법，분석교각수력。결과표명：단렬발생재하판탁한봉단부，단구정현명현적피로특정；조성단렬적주요원인시판탁한봉단부적응력수평교고，이급한봉존재미한투결함가극응력집중，명의응력교대，유발료피로피로렬문원적맹생，제출료제승한접질량、우화교각부건설계등조시，대연장교각적피로수명구유지도의의。
Fracture occurred to a automobile welding axle housing in the fatigue test. In order to find out the failure mode and cause, macro and micro observation, chemical composition and hardness testing, metallographic examination and finite element analysis were carried out. The results show that the fracture is fatigue fracture occurring at the weld edge of the lower shell supporter. There was higher stress at the weld edge, and the incomplete penetration aggravated the stress concentration, which was the main cause for the initiation of fatigue crack. Based on the analysis results, some measures were put forward, such as improving welding quality and optimizing the design of the axle housing.