DIRECT OBSERVATION OF FRICTIONAL CONTACTS - NEW INSIGHTS FOR STATE-DEPENDENT PROPERTIES
DIRECT OBSERVATION OF FRICTIONAL CONTACTS - NEW INSIGHTS FOR STATE-DEPENDENT PROPERTIES
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DOI：
10.1007/bf00874332
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发表时间：
1994-01-01
影响因子：
2
通讯作者：
KILGORE, BD
中科院分区：
文献类型：
--
作者：
DIETERICH, JH;KILGORE, BD
岩石和许多其他材料显示出摩擦力对滑动历史的一种相当复杂但又很有特点的依赖性。这些影响很好地描述了经验率和状态相关的本构方程，已被用于断层滑动和地震过程的分析。我们提出了一个直接定量显微镜观察滑动过程中的摩擦接触。观察结果表明，摩擦状态的依赖性表示的接触面积与接触年龄的增加。滑动阻力的瞬态变化与接触面积的变化相关，并由接触人口年龄的变化引起。位移相关的更换接触人口被证明会导致诊断的摩擦演变超过一个特征滑动距离，发生时，滑动开始或滑动条件的变化。
Rocks and many other materials display a rather complicated, but characteristic, dependence of friction on sliding history. These effects are well-described by empirical rate- and state-dependent constitutive formulations which have been utilized for analysis of fault slip and earthquake processes. We present a procedure for direct quantitative microscopic observation of frictional contacts during slip. The observations reveal that frictional state dependence represents an increase of contact area with contact age. Transient changes of sliding resistance correlate with changes in Contact area and arise from shifts of contact population age. Displacement-dependent replacement of contact populations is shown to cause the diagnostic evolution of friction over a characteristic sliding distance that occurs whenever slip begins or sliding conditions change.