First-order phase transition between the liquidlike and solidlike structures of a boundary lubricant

被引：22
|
作者：
Lyashenko, I. A. [1 ]
机构：
[1] Sumy State Univ, UA-40007 Sumy, Ukraine
来源：
TECHNICAL PHYSICS | 2012年 / 57卷 / 01期
关键词：
FRICTION; SURFACES; ADHESION; STICK; MODEL; FILM;
D O I：
10.1134/S1063784212010173
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
A thermodynamic model for characterization of the first-order phase transition between the structural states of a boundary lubricant is suggested. It is shown that melting of the lubricant is due both to a rise in its temperature and to shear experienced by friction surfaces when elastic strains (stresses) exceed a critical value. A phase diagram with regions of dry and sliding friction is constructed. Using a mechanical analogue of the tribological system, the dependence of the friction force on the lubricant temperature and relative shear rate of the friction surfaces is analyzed. The observed conditions of stick-slip friction, which is the main reason for friction parts wear, are described. Reasons for stick-slip friction are revealed.
引用
收藏
页码：17 / 26
页数：10
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