CAJ | 학술논문

操动机构产品碟形弹簧在使用过程中发生早期疲劳断裂，通过宏观检验、化学分析、金相检验、扫描电镜与能谱分析等方法对碟形弹簧断裂的原因进行了分析。结果表明：在碟形弹簧凹面内环面和端面交界处存在较集中的疏松孔隙，且有的贯通至表面而形成预裂纹，其在最大交变切应力作用下造成应力集中，预裂纹优先发展成疲劳裂纹源并扩展导致碟形弹簧断裂。碟形弹簧表面存在的折迭、微裂纹和疤痕等缺陷也是极大的安全隐患。
조동궤구산품설형탄황재사용과정중발생조기피로단렬，통과굉관검험、화학분석、금상검험、소묘전경여능보분석등방법대설형탄황단렬적원인진행료분석。결과표명：재설형탄황요면내배면화단면교계처존재교집중적소송공극，차유적관통지표면이형성예렬문，기재최대교변절응력작용하조성응력집중，예렬문우선발전성피로렬문원병확전도치설형탄황단렬。설형탄황표면존재적절질、미렬문화파흔등결함야시겁대적안전은환。
Early fatigue fracture occurred to disk springs of hydraulic spring operation system during service. The failure cause was analyzed by means of chemical analysis, metallographic examination, scanning electron microscopy and energy spectrum analysis. The results show that there existed a higher concentration of loose structure and pores at the junction of the concave inner surface and the end of the disc spring, and some of them broke through to the surface, forming a pre-crack. Stress concentration was caused by pre-cracks under the effect of maximum alternating shear stress. Pre-cracks acted as fatigue crack source. Fatigue crack propagated and resulted in the fracture. Defects such as folding, micro-cracks and scars at the surface of the disc spring also influence the security of disk springs.