摘要
针对理想状态下的微凸体接触变形只考虑径向力的作用,没有贴近实际的接触变形的问题,考虑了切向力的存在,引入摩擦系数这一变量,分析摩擦系数对接触的影响,建立了新的弹性阶段变形、弹塑性阶段第Ⅰ区、弹塑性阶段第Ⅱ区变形和塑性阶段变形的关系函数。结果表明在塑性条件下,随着摩擦系数增大,塑性阶段的微凸体接触面积明显减小;在弹性和弹塑性阶段,随摩擦系数的增大,微凸体的接触面积减小缓慢,逐渐趋近平稳不变。在同一分形维数的前提下,对4个变形阶段,分别考虑了不同的摩擦作用,在弹性和弹塑性阶段,减小摩擦系数可以明显提高承载能力;在塑性阶段,承载能力不随摩擦因素的变化而变化。
In view of the problem that only the effect of radial force is considered for the micro-convex body contact deformation under ideal conditions,which is not close to the actual contact deformation,the existence of tangential force was considered,and the friction coefficient was introduced to analyze the influence of friction coefficient on contact.A new function for the relationship of elastic stage deformation,elastic-plastic deformation stage I,elastic-plastic deformation stage II and plastic stage deformation was established.The results show that under the plastic condition,the contact area of the micro-convex body in the plastic stage decreases obviously with the increase of friction coefficient.In the elastic and elastic-plastic stages,the contact area of micro-convex decreases slowly with the increase of the friction coefficient,and gradually tends to be stable.Under the premise of the same fractal dimension,different friction effects were considered for the four deformation stages.In the elastic and elastic-plastic stages,the reduction of the friction coefficient can significantly improve the bearing capacity;while in the plastic stage,the bearing capacity does not change with the change of friction coefficients.
作者
陆辉山
黄永凯
王福杰
侯若羿
LU Hui-shan;HUANG Yong-kai;WANG Fu-jie;HOU Ruo-yi(Robotics and Intelligent Equipment Laboratory,North University of China,Taiyuan 030000,China)
出处
《塑性工程学报》
CAS
CSCD
北大核心
2019年第6期301-305,共5页
Journal of Plasticity Engineering
基金
“十三五”国家重点研发项目(2016YFD0700202)
关键词
摩擦系数
切向力
微凸体
接触面积
接触载荷
承载能力
friction coefficient
tangential force
micro-convex body
contact area
contact load
bearing capacity
