Elastic-plastic spherical contact under combined normal and tangential loading in full stick
Elastic-plastic spherical contact under combined normal and tangential loading in full stick
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DOI：
10.1007/s11249-006-9156-y
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发表时间：
2007-01-01
影响因子：
3.2
通讯作者：
Etsion, I.
中科院分区：
文献类型：
--
作者：
Brizmer, V.;Kligerman, Y.;Etsion, I.
从理论上研究了在法向和切向载荷联合作用下，全杆接触条件下可变形球体与刚性平板之间的弹塑性接触行为。滑动起始被视为塑性屈服失效机制，这允许在高度粘附条件下的静摩擦建模。研究了接触面的切向刚度、静摩擦力和静摩擦系数等接触参数。简要描述了结生长现象和接触区塑性区的演化。研究发现，在低法向无量纲载荷下，静摩擦系数随法向载荷的增大而急剧减小，这与经典的摩擦定律相违背。随着法向载荷进一步增加，静摩擦系数接近恒定值，对于许多材料特性组合，该恒定值约为0.3。
The behavior of an elastic-plastic contact between a deformable sphere and a rigid flat under combined normal and tangential loading with full stick contact condition is investigated theoretically. Sliding inception is treated as a plastic yield failure mechanism, which allows static friction modeling under highly adhesive conditions. Several contact parameters such as: junction tangential stiffness, static friction force and static friction coefficient are extensively investigated. The phenomenon of junction growth and the evolution of the plastic zone in the contact region are briefly described. It is found that at low normal dimensionless loads the static friction coefficient decreases sharply with increasing normal load, in breach with the classical laws of friction. As the normal load further increases the static friction coefficient approaches a constant value that is about 0.3 for many material properties combinations.