Frictional sliding starts with a crack front propagating across an interface — a process that is well described by fracture mechanics. Experiments now show that the onset of crack formation is governed by physics that is yet to be fully understood.

中文翻译：

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滑倒的开始

摩擦滑动始于裂纹前沿在界面上的传播——断裂力学很好地描述了这一过程。现在的实验表明，裂纹形成的开始是由尚未完全了解的物理学控制的。