纯滚动状态下氮化硅陶瓷球临界应力分析  

CRITICAL STRESS OF SILICON NITRIDE CERAMIC BALLS UNDER PURE ROLLING CONDITION

作　　者：周井玲[1] 吴国庆[2] 任雨松[2] 陈晓阳[1] 

机构地区：[1]上海大学机电工程学院,上海200072 [2]南通大学机械工程学院,南通226007

出　　处：《机械强度》2007年第4期661-665,共5页Journal of Mechanical Strength

基　　金：上海市科技发展基金重点项目(0152nm031);江苏省教育厅自然科学基金项目(05KJB460106);南通市青年学术带头人带课题进修计划项目(Z5005);南通大学自然科学基金项目(06Z032)。~~

摘　　要：氮化硅陶瓷球临界应力在很大程度上决定其滚动接触疲劳和磨损寿命。由于陶瓷材料的抗拉能力较弱,所以设想其滚动接触疲劳失效的临界应力为最大主拉应力。应用弹性接触力学和赫兹理论分析纯滚动条件下陶瓷球表面层接触应力,得到表面层最大主拉应力。针对理论计算值,设计相应的纯滚动接触疲劳实验。分析表明,理论值与实验结果趋于一致,从而证实最大主拉应力为氮化硅陶瓷球滚动接触疲劳失效的临界应力。计算结果为陶瓷球的滚动接触疲劳寿命分析提供理论基础。The rolling contact fatigue life and wear life of Silicon nitride ceramic balls are determined by critical stress in a way. For a ceramic material ball under the passage of a contact load, the critical stress is assumed to be the maximum principal tensile stress because of its lower tensile strength. Contact stress field in subsurface was analyzed using elastic contact mechanics and Hertz theory under pure rolling condition. Maximum principal tensile is obtained. The pure rolling contact fatigue test was performed correspondent to theory calculation. It is shown by analysis that theory values are generally consistent with test result. Consequently it is verified that critical stress of Silicon nitride ceramic balls is the maximum principal tensile stress. Theory foundation may be provided by calculation resuits to analyze the roiling contact fatigue life of ceramic balls.

关 键 词：纯滚动 陶瓷球 临界应力 

分 类 号：O343.3[理学—固体力学]