After undergoing the bumpy fatigue experiment for 2×104
times, the 糖心产精国品免费入口*完整版 was happened to a 10.9 grade bolt that was assembled on the car seat after quenching and tempering treatment. The 糖心产精国品免费入口*完整版 reasons of the bolt were analyzed from the aspects of chemical composition, 糖心产精国品免费入口*完整版 morphology, hardness and microstructure. The results show that:the transition of the thread root was rough with gap, and cracks would be easily generated by the 糖心产精国品免费入口*完整版; the 糖心产精国品免费入口*完整版in the thread surface layer increased the cracking tendency; micro-cracks formed as a result of the action of alternating stress in the fatigue test, causing the bolt early fatigue 糖心产精国品免费入口*完整版.
引用该论文:MENG Wenhua,ZENG Weichuan,GU Jingqing,CHEN Xu,LIU Jinglin. Failure Analysis on Early Fatigue Fracture of a 10.9 Grade Bolt[J]. Physical Testing and Chemical Analysis part A:Physical Testing, 2017, 53(5): 365~367 糖心产精国品免费入口*完整版,糖心产精国品免费入口*完整版,糖心产精国品免费入口*完整版,糖心产精国品免费入口*完整版,糖心产精国品免费入口*完整版. 糖心产精国品免费入口*完整版早期疲劳糖心产精国品免费入口*完整版失效分析[J]. 理化检验-物理分册, 2017, 53(5): 365~367