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High Temperature Fretting Fatigue Properties of Silicon Nitride

氮化硅的高温微动疲劳性能

基本信息

批准号：
04650062
负责人：
MUTOH Yoshiharu
金额：
$ 1.34万
依托单位：
Nagaoka University of Technology
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1992
资助国家：
日本
起止时间：
1992 至 1993
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-04650062/
关键词：
Fretting Fatigue Test apparatus Silicon Nitride Fatigue Fracture Process Relative Slip Amplitude Friction Coefficient Contact Pressure 相対すべり量

项目摘要

(1) A fretting fatigue test machine for ceramic materials was designed and fabricated to investigate the fretting fatigue properties of ceramic materials. Fretting occurred at the contact surface between the rectangular specimen which was maintained under static fatigue conditions and the cylindrical contact piece. The major factors which affect the fretting fatigue properties such as relative slip amplitude and contact load can be controlled and their values can be measured in the test machine.(2) Fretting significantly reduced static fatigue strength of silicon nitride. Fretting damage was observed on the contact surface under small relative slip amplitude which never produced fretting damage in the case of metallic materials. Since fretting cracks are initiated at a very carly stage of fatigue life, crack propagation life is dominant in fretting fatigue life.(3) Fretting fatigue strength of silicon nitride was not necessarily decreased with increasing the contact load(contact pressure), which is in contrast with the case of metallic materials. This contray behavior in ceramics is resulted from that the relative slip ampilitude between specimen and contact pad increases with decreasing the contact load.(4) Fretting fatigue strengh of silicon nitride is affected not only by frictional force but also by the condition of partial slip in the contact region, that is fretting wear behavior.(5) Fretting fatigue tests under static and cyclic loading conditions showed that the effect of cyclic loading on fretting fatigue strngth of silicon nitride was almost negligible, and fretting fatigue stenghts under two test conditions were indentical.

(1)为了研究陶瓷材料的微动疲劳性能，设计并制作了一台陶瓷材料微动疲劳试验机。微动磨损发生在静态疲劳条件下保持的矩形试样和圆柱形接触件之间的接触表面。在微动疲劳试验机上可以控制和测量影响微动疲劳性能的主要因素，如相对滑动幅值和接触载荷。(2)微动磨损显著降低了氮化硅的静态疲劳强度。在小相对滑动振幅下，在接触表面上观察到微动损伤，而在金属材料的情况下不会产生微动损伤。由于微动裂纹萌生于疲劳寿命的早期阶段，因此裂纹扩展寿命在微动疲劳寿命中占主导地位。(3)氮化硅的微动疲劳强度并不一定随着接触载荷（接触压力）的增加而降低，这与金属材料的情况相反。陶瓷材料的这种相反行为是由于试样与接触垫之间的相对滑移幅度随接触载荷的减小而增大。(4)氮化硅的微动疲劳强度不仅受摩擦力的影响，还受接触区局部滑移条件的影响，即微动磨损行为。(5)静态和循环加载条件下的微动疲劳试验表明，循环加载对氮化硅的微动疲劳强度影响很小，两种试验条件下的微动疲劳强度相同。