Accession Number : AD0616291

Title :   FATIGUE FAILURE OF SURFACE FILMS.

Descriptive Note : Interim technical rept. for 1 Aug-31 Oct 64,

Corporate Author : RENSSELAER POLYTECHNIC INST TROY N Y

Personal Author(s) : Hsu,Y. C. ; Ling,F. F.

Report Date : APR 1965

Pagination or Media Count : 49

Abstract : For the purpose of correlating the maximum shear stress at the film-substrate interface to the fatigue life of the film the quasi-stationary nature of the shear stress at the interface of a surface layer and the substrate as induced by a load moving at a constant speed along the surface of the layer is investigated. The substrate occupies the half-space. Solutions in integral form, based on the two-dimensional theory of elasticity, are obtained for the shear stress at the interface for the cases of: (a) layer material at subsonic speed; (b) layer material at transonic speed; and (c) layer material at supersonic speed. For all cases, the base material is subsonic. Subsonic and supersonic refer to speeds less than speed of propagation of shear wave and greater than the speed of propagation of dilatational wave, respectively. (Author)

Descriptors :   (*FILMS, SURFACES), (*FATIGUE(MECHANICS), FILMS), (*SHEAR STRESSES, FATIGUE(MECHANICS)), FAILURE(MECHANICS), ELASTIC PROPERTIES, LOADS(FORCES), STRESSES, MATHEMATICAL ANALYSIS, INTEGRAL EQUATIONS

Distribution Statement : APPROVED FOR PUBLIC RELEASE