Wear processes during frictional sliding of rock: A theoretical and experimental study
Wear processes during frictional sliding of rock: A theoretical and experimental study
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DOI：
10.1029/93jb02875
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发表时间：
1994-04
影响因子：
--
通讯作者：
Weibin Wang;C. Scholz
中科院分区：
文献类型：
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作者：
Weibin Wang;C. Scholz
使用旋转装置进行的岩石摩擦磨损实验研究表明，磨损损失（摩擦滑动过程中两个物体界面上的材料损失）是法向应力和滑动表面初始粗糙度的函数。在给定的法向应力和初始粗糙度下，磨损量-滑动位移关系表明磨损率最初很高，然后逐渐减小到恒定值。磨损过程导致表面形貌的演变，如不同磨损阶段的表面轮廓仪测量结果所示。粗糙高度的分布表明，滑动表面的顶部随着滑动的积累而逐渐被截断。基于弹性接触的两个粗糙表面的模型，磨损数值模型可以描述两个不同阶段的磨损：瞬态阶段和稳态阶段。在瞬态阶段，磨损机制被解释为互锁粗糙体的剪切。该机制的总贡献与粗糙体的重叠体积 V* 成正比，V* 与初始粗糙度以及法向应力有关。在稳态阶段，磨损几乎与位移成线性关系，磨损率与两个粗糙表面之间的实际接触面积成正比。引入参数 h（两个接触粗糙体之间的互锁距离）可以更好地理解不同表面粗糙度的磨损过程。低于互锁距离 hc 的临界值时，接触粗糙体弹性变形并在彼此上滑动。当 h > hc 时，它们倾向于剪切。该模型预测了法向应力和初始粗糙度的影响，其预测结果与实验结果吻合较好。
An experimental study of frictional wear of rock, conducted with a rotary apparatus, shows that wear loss, the loss of material from the interface of two bodies during frictional sliding, is a function of normal stress and the initial roughness of the sliding surface. Under a given normal stress and initial roughness, the wear loss-sliding displacement relationship indicates that wear rate is initially high and then gradually decreases to a constant value. The wear process results in an evolution of the surface topography as shown from prof'fiometer measurements of the surface at different stages of wear. The distribution of asperity heights shows that the top of the sliding surface is progressively truncated with accumulated slip. Based on a model of two rough surfaces in elastic contact, a numerical model for wear can describe wear in two different stages: a transient stage and a steady state stage. In the transient stage, the wear mechanism is interpreted as shearing off of interlocking asperities. The total contribution by this mechanism is proportional to the overlapping volume of the asperities, V*, which is related to the initial roughness as well as the normal stress. In the steady state stage, wear is almost linear with displacement and the wear rate is proportional to the real area of contact between the two rough surfaces. Introducing a parameter h, the interlocking distance between two contacting asperities, provides a better understanding of the wear process with different surface roughnesses. Below a critical value of interlocking distance hc, the contacting asperities deform elastically and slide over each other. When h > hc, they tend to shear off. The model predicts the effects of normal stress and initial roughness, and its predictions are in good agreement with the experimental results.