CAJ | 학술논문

飞机地面试验时发现加油吊舱转接件出现裂纹并漏油，该加油吊舱转接件为焊接组合件，裂纹出现在盖板的近R角处，盖板铸件材料为ZL116铝合金。通过采用外观观察、断口分析、金相组织分析、成分分析、力学性能测试等方法，对加油吊舱转接件裂纹产生原因进行分析，并进行人工断口的对比分析。结果表明：加油吊舱转接件开裂是由大应力和组织塑性差共同作用所致，大应力主要来源于结构应力集中、焊接内应力、焊接后校形应力、装配及试验应力等；提出铸件改为预拉伸板或增加焊道距R角的距离等改进措施。
비궤지면시험시발현가유조창전접건출현렬문병루유，해가유조창전접건위한접조합건，렬문출현재개판적근R각처，개판주건재료위ZL116려합금。통과채용외관관찰、단구분석、금상조직분석、성분분석、역학성능측시등방법，대가유조창전접건렬문산생원인진행분석，병진행인공단구적대비분석。결과표명：가유조창전접건개렬시유대응력화조직소성차공동작용소치，대응력주요래원우결구응력집중、한접내응력、한접후교형응력、장배급시험응력등；제출주건개위예랍신판혹증가한도거R각적거리등개진조시。
The refueling pod adaptor of an aircraft was found to have crack and leak during testing. The refueling pod adaptor was welding assembly. The crack was found near R angle of the cover plate, whose material is ZL116 alumium alloy. The failure mode and cause were analyzed by macro and micro observation, microstructure examination, chemical composition analysis, and mechanical property testing. The results show that the crack of the adapter was caused by the co-effect of the poor plasticity and excessive stress. The excessive stress mainly came from the structure stress concentration, welding stress, shape correction stress, assembly and test stress. It is suggested that the cover plate should be replaced with a pre-stretching plate or the distance between R angle and the welding path should be increased.