圆锥微凸体在粗糙表面接触分析中的应用

发布时间：2018-05-25 20:09

本文选题：圆锥微凸体 + 粗糙表面　；参考：《西安交通大学学报》2017年11期

【摘要】：为了从微观角度研究粗糙表面的法向接触特性,构建了一种具有圆锥微凸体的有限元分析模型。对反双曲余弦应力进行定积分,获得了作用在单个圆锥接触区域的总法向弹性接触力;给出了圆锥顶点法向变形量与接触半径之间的拟合公式。数值模拟表明:反双曲余弦应力在锥尖处(接触区域的中心)有一个自然对数奇点,但作用在单个圆锥接触区域的总法向弹性接触力有边界;单个圆锥的法向弹性接触载荷随着半顶角的增加先增大后减小;结合部整体的法向接触载荷随着表面粗糙度的减小而增大;当法向最大变形量明显增大时,结合部整体的法向接触载荷随着法向最大变形量的增加仅有微小的增加;半顶角越大,单个圆锥的法向接触刚度也越大;随着圆锥顶点法向变形量的增加,单个圆锥的法向接触刚度先略微减小,而后保持不变;法向临界变形量较小时,结合部整体的法向接触刚度随着法向临界变形量的增加而近似于线性增大;表面粗糙度越小,结合部整体的法向接触刚度增加得越明显;法向临界变形量较大时,结合部整体的法向接触刚度趋于不变。
[Abstract]:In order to study the normal contact characteristics of rough surfaces from a microscopic point of view, a finite element analysis model with a conical microconvex body is constructed. The stress of the anti hyperbolic cosine is fixed, and the total normal elastic contact force acting on a single conical contact area is obtained, and the fitting between the deformation quantity of the conical vertex normal and the contact radius is given. The numerical simulation shows that the inverse hyperbolic cosine stress has a natural logarithmic singular point at the tip of the cone point (the center of the contact area), but the general method of action in a single conical contact area has a boundary to the elastic contact force; the normal elastic contact load of a single cone increases first and then decreases with the addition of the half angle; the method of the integral part of the combined part is in contact with the contact load. When the surface roughness decreases, the normal contact load of the integrated part increases only slightly with the increase of the maximum normal deformation when the maximum deformation amount increases, the greater the semi top angle, the greater the normal contact stiffness of the single cone; with the increase of the cone vertex method, the single cone method is increased. The contact stiffness is slightly reduced and then kept unchanged, and the normal degree of normal contact stiffness of the combined part increases approximately linearly with the increase of the normal critical deformation. The smaller the surface roughness is, the more obvious the normal contact stiffness of the integrated part increases; when the normal critical deformation amount is larger, the binding part is whole. The normal contact stiffness of the body tends to be constant.
【作者单位】：三峡大学机械与动力学院;
【基金】：国家自然科学基金资助项目(51605255)
【分类号】：TH161.14

【相似文献】