Lesson 15 Introduction to tribology摩擦学概论 机械专业专业英语教学用书.pptVIP

Lesson 15 Introduction to tribology摩擦学概论 Tribology is defined as the science and technology of interacting surfaces in relative motion, having its origin in the Greek word tribos meaning rubbing. It is a study of the friction, lubrication, and wear of engineering surfaces with a view to understanding surface interactions in detail and then prescribing （开药方）improvements in given applications. The work of the tribologist is truly interdisciplinary（跨学科的）, embodying（包括）physics, chemistry, mechanics, thermodynamics, and materials science, and encompassing（包括）a large, complex, and interwinded（交织）area of machine design, reliability, and performance where relative motion between surfaces is involved. Lesson 15 Introduction to tribology摩擦学概论 It is estimated that approximately one-third of the world’s energy resources in present use appear as friction power in one form or another. This represents a staggering [st?ɡ?ri?]（惊人的）loss of potential power for today’s mechanized society. The purpose of research in tribology is understandably the minimization and elimination of unnecessary waste at all levels of technology where the rubbing of surfaces is involved. Lesson 15 Introduction to tribology摩擦学概论 One of the important objectives in tribology is the regulation of the magnitude of frictional forces according to whether we require a minimum (as in machinery) or a maximum (as in the case of anti-skid surfaces防滑表面). It must be emphasized, however, that this objective can be realized only after a fundamental understanding of the frictional process is obtained for all conditions of temperature, sliding velocity, lubrication, surface roughness, and material properties. Lesson 15 Introduction to tribology摩擦学概论 The most important criterion from a design viewpoint in a given application is whether dry or lubricated conditions are to prevail (起主导作用）at the sliding interface. In many applications such as machinery, it is known that only one condition shall prevail (usually lubri