CAJ | 학술논문

承压杯安装在刹车壳体上，在使用过程中多个承压杯发生断裂。通过承对压杯外观观察，断口宏微观观察、能谱分析、金相组织检查、硬度检查、氢含量检测、有限元仿真模拟计算，并仿照承压杯的工作状况对完好承压杯进行了模拟试验。结果表明：承压杯的失效性质为镉脆开裂；承压杯失效原因为：工作环境经历较高的温度，在刹车过程中承压杯上表面导圆角处受到较大的拉应力，而承压杯表面采用了不适当的表面镀镉工艺，在这些因素的综合作用下承压杯发生镉脆开裂。故障发生的根本原因在于对承压杯的结构与受力考虑不充分。
승압배안장재찰차각체상，재사용과정중다개승압배발생단렬。통과승대압배외관관찰，단구굉미관관찰、능보분석、금상조직검사、경도검사、경함량검측、유한원방진모의계산，병방조승압배적공작상황대완호승압배진행료모의시험。결과표명：승압배적실효성질위력취개렬；승압배실효원인위：공작배경경력교고적온도，재찰차과정중승압배상표면도원각처수도교대적랍응력，이승압배표면채용료불괄당적표면도력공예，재저사인소적종합작용하승압배발생력취개렬。고장발생적근본원인재우대승압배적결구여수력고필불충분。
Several bearing cups mounted on a braking shell of an aircraft braking unit cracked during service. Through macro and micro appearance observation, EDS analysis, metallurgical structure inspection, hardness and hydrogen content testing, FEA simulation and simulation test, the failure cause was analyzed. The results show that the cracking of the bearing cups was cadmium brittleness cracking. The failure took place under the co-effect of higher temperature service environment, bigger tensile stress near the round angle, and improper cadmium -plating process. The fundamental cause for this failure was inadequate consideration on the structure and stress of the bearing cups.