摘要
基于自主设计的螺栓连接振动试验装置,系统研究了横向交变载荷下TiCN/MoS2涂层螺栓分别与TiCN/MoS2涂层螺母和无涂层螺母配合时连接结构的松动行为,并利用体式显微镜(OM)、扫描电子显微镜(SEM)、电子能谱仪(EDX)和白光干涉仪等微观分析设备对试验后的螺纹表面进行损伤分析,深入讨论其磨损机理.结果表明:在相同试验条件下,TiCN/MoS2涂层螺栓比无涂层螺栓螺纹表面的损伤轻微,连接结构的松动程度更低;与无涂层螺栓螺纹根部相同等效应力状态下,TiCN/MoS2涂层螺栓连接结构的预紧力可提高约10%,螺纹表面的损伤减轻,同时连接结构的松动程度进一步降低;TiCN/MoS2涂层螺栓螺纹表面的主要磨损机制为疲劳磨损.
Based on the self-designed testing equipment for bolted joints, the self-loosening behaviour of the TiCN/MoS2 coated bolts, which were connected with the TiCN/MoS2 coated nuts and the uncoated nuts respectively,was systematically studied under transverse alternating load. After tests, the morphologies of the damaged threads were analyzed using three-dimensional microscope, scanning electron microscope, energy dispersive X-ray and white light interferometer. Furthermore, the wear mechanisms were investigated on the first thread surfaces. The results showed that the thread damage of the TiCN/MoS2 coated bolts was slighter than that of the uncoated bolts, and the self-loosening degree of the TiCN/MoS2 coated bolts was lower than that of the uncoated bolts under the same experimental parameters. Moreover, under the same equivalent stress as that of the uncoated bolts at the thread root, the preload of the TiCN/MoS2 coated bolt can be improved by about 10%, the damage of the thread surface was further reduced, and the self-loosening degree of bolted joints was also decreased. In addition, delamination was the main wear mechanism on the first thread surface of the composite coated bolts.
作者
胡华民
李涛
张挺
刘建华
蔡振兵
莫继良
彭金方
朱旻昊
HU Huamin;LI Tao;ZHANG Ting;LIU Jianhua;CAI Zhenbing;MO Jiliang;PENG Jinfang;ZHU Minhao(Tribology Research Institute,State Key Laboratory of Traction Power,Southwest Jiaotong University,Sichuan Chengdu 610031,China;School of materials science and engineering,Southwest Jiaotong University,Sichuan Chengdu 610031,China)
出处
《摩擦学学报》
EI
CAS
CSCD
北大核心
2020年第5期569-578,共10页
Tribology
基金
国家自然科学基金项目(51705434)
四川省重点研发项目(2019YFG0290)
长寿命高温材料国家重点实验室开放课题(DTCC28EE10930)资助。