回转窑滚圈多轴疲劳寿命预测及与轴线偏移关系研究  

Multiaxial Fatigue Life Prediction of Kiln Roller Under the Axis Line Deflection

作　　者：沈意平[1,2] 王送来[1] 李学军[1] B.S.迪隆 

机构地区：[1]湖南科技大学机械设备健康维护湖南省重点实验室,湖南湘潭411201 [2]渥太华大学机械学院

出　　处：《应用数学和力学》2010年第2期191-198,共8页Applied Mathematics and Mechanics

基　　金：国家"863"计划基金资助项目(2007AA04Z415);国家自然科学基金资助项目(50675066);湖南省教育厅项目(09C407)

摘　　要：结合轴线偏移情况开展回转窑滚圈多轴疲劳寿命研究,采用了Wang和Brown提出的多轴疲劳准则和雨流计数法及Miner准则进行累积损伤评估.回转窑运行轴线偏移会导致滚圈承受的支承载荷分布严重不均,因此引入载荷比来描述轴线偏移程度以进一步定量分析滚圈应力.采用有限元软件ANSYS进行了各载荷比下滚圈的接触应力分析,并根据滚动接触区域情况计算得到了切向摩擦应力.以某回转窑滚圈为分析对象,计算得到了随载荷比变化的疲劳寿命曲线,揭示了轴线偏移对滚圈疲劳寿命的影响规律.研究对减少滚圈疲劳失效有重要意义,同时也可作为轴线调整和优化调窑的理论依据.Multiaxial fatigue life of the roller in rolling contact with wheels with respect to axis line deflection was investigated. The multiaxial fatigue criterion proposed by Wang and Brown, together with rainflow counting method and the Miner-Palmgren＇ s rule, were applied for cumulative damage estimation and life prediction. As axis line deflection of overlong kilns generally results in asymmetric load distribution on each roller, the load ratio was introduced to describe deflection for quantitative stress anaylsis, which was performed within the finite element code ANSYS. And the tangential frictional stress was calculated in terms of the rolling contact area condition. By taking one roller as an example, the plotted fatigue life curve versus load ratio discovers how axis line deflection affects fatigue life. The study is quite significant to prevent fatigue failure of the roller, and can provide basis to adjust and optimize axis line of rotary kiln.

关 键 词：疲劳寿命 多轴疲劳 轴线偏移 滚动接触 

分 类 号：O346[理学—固体力学] TH114[理学—力学]