Wear of piston rings and cylinder liners has been examined tLSing a wide rang of techniques and a very good cOTT~lation has been obtained through the use of these, with the w~ar behavior in servic engines, test-bed tngines, and laboratory tests. This 首ld form the basis for further eelopment of mattriaLr, particularly surface coatings, to inCT~as~ both the ~fficienC)' and w~ar lif~ of the componnIts. A clear pictur~ of the wear mechanisms including abrasion,scuffing, and corrosion has emerg~d, but much remains to be done,particularly in inttTT~lating wear and lubrication to produce smooth, etched, long-lif~ surfaces. A wear debris atlas is available which, however, is somewhat limited in its tLSe and information 首ld be collected to establish a "wear atlas," particularly for will establish~d contacting bodies and for specific engin ering applications. Much of this information is already available for piston rings and rylindtr liners, some of which is presented in this investigation. TE 99 通用摩擦磨損試驗機