摩擦系数对支承辊次表层接触疲劳损伤的影响  

Effect of Friction Coefficients on the Backup Rolls' Subsurface Contact Fatigue Damage

作　　者：孙大乐[1] 秦晓峰[1] 谢里阳[1] 吴琼[2] 

机构地区：[1]东北大学机械工程与自动化学院,辽宁沈阳110819 [2]宝山钢铁集团有限公司,上海201900

出　　处：《东北大学学报（自然科学版）》2014年第5期731-734,共4页Journal of Northeastern University(Natural Science)

基　　金：国家高技术研究发展计划项目(2012AA040104)

摘　　要：以正交剪应力作为滚动接触次表层疲劳损伤评价的临界应力,分析了摩擦系数对滚动接触次表层正交剪应力幅及应力比的影响规律.根据疲劳损伤累积理论及非对称循环应力幅修正公式,建立了支承辊次表层接触疲劳应力与寿命计算模型,用于评价支承辊次表层接触疲劳损伤.实例分析了摩擦系数对支承辊次表层接触疲劳损伤的影响,结果表明:随着应力比及摩擦系数增大,支承辊的次表层接触疲劳损伤增大,因此,降低支承辊接触摩擦系数,可改善支承辊的疲劳损伤.The orthogonal shear stress was selected as the key stress controlling the subsurface rolling contact fatigue damage. The influence of friction coefficient on the subsurface orthogonal shear stress under rolling contact was analyzed. Based on the linear fatigue accumulation rule and a modified equation for the stress rang of unsymmetrical cycling stress, the relationship between the subsurface stress and fatigue life was established to assess the subsurface rolling contact fatigue damage of backup rolls. An instance was implemented to analyze the influence of friction coefficient on the subsurface rolling contact fatigue damage of backup rolls. The result shows that the subsurface rolling contact fatigue damage of backup rolls increase with the increase of stress ratio and friction coefficient. So the fatigue damage of backup roll can be lessened by decreasing its friction coefficient.

关 键 词：支承辊 正交剪应力 次表层接触疲劳 摩擦系数 应力幅 应力比 

分 类 号：TH114[机械工程—机械设计及理论] TG333.17[金属学及工艺—金属压力加工]