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）设计和制造了用于陶瓷材料的疲劳测试机，以研究陶瓷材料的疲劳特性。在矩形样品之间的接触表面上发生了插图，该试样保持在静态疲劳条件和圆柱接触片中。可以控制影响疲劳特性的主要因素，例如相对滑动幅度和接触载荷，并且可以在测试机中测量其值。（2）折线显着降低了硝酸硅的静态疲劳强度。在小相对滑动幅度下，在接触表面上观察到有局部的损坏，这在金属材料的情况下从未产生微分损伤。由于在非常疲劳寿命的非常carly阶段启动了碎裂裂纹，因此裂纹繁殖寿命在疲劳寿命中占主导地位。（3）与金属材料相反，不一定会随着接触载荷的增加（接触压力）而降低氮化硅的疲劳强度。陶瓷中这种偶然行为的原因是，样品和接触垫之间的相对滑动轴向随着接触载荷的减少而增加。（4）硝酸硅硅硅的疲劳strengh不仅受到摩擦力的影响，不仅受摩擦力的影响，而且还受到了局部滑移的状态，在接触区域中表现出了疲劳的效果，并且伴随着效果。在氮化硅的疲劳疲劳上加载几乎可以忽略不计，在两个测试条件下疲劳的疲劳stenght是坚定的。