Accession Number : ADA180013

Title :   Temperature Field in the Vicinity of a Near-Surface Void Due to High-Speed Friction Load.

Descriptive Note : Technical rept.,

Corporate Author : NEW MEXICO UNIV ALBUQUERQUE DEPT OF MECHANICAL ENGINEERING

Personal Author(s) : Ju, Frederick D ; Chen, Tsu-Yen

PDF Url : ADA180013

Report Date : Feb 1987

Pagination or Media Count : 49

Abstract : The present investigation expound on the effect of a near-surface cavity, when the solid surface is subjected to the Coulomb frictional loading of an asperity moving at moderately high-speed. The medium under consideration is represented by a solid half space which is coated with a thin layer of solid wear coating. The cavity in the present report is rectangular. The temperature field and its gradient in the vicinity of the cavity result from the traverse of the asperity over the wear surface near the cavity. The cavity defect results in a material nonuniformity mathematically modelled in terms of the material coordinates. The resulting governing differential equation is time-explicit and transient. A general finite difference formulation is developed, from which numerical solutions were obtained for problems with a cavity at various positions relative to the surface-layer/substrate interface. Because of the poor heat transfer characteristics of the cavity, the temperatures in the surface layer above it are higher than those in the surrounding region. This phenomenon causes a higher temperature gradient, especially at the trailing corner of the rectangular cavity.

Descriptors :   *CAVITIES, *FRICTION, *THERMAL STRESSES, COATINGS, COORDINATES, DEFECTS(MATERIALS), DIFFERENTIAL EQUATIONS, FINITE DIFFERENCE THEORY, FORMULAS(MATHEMATICS), HEAT TRANSFER, HIGH RATE, HIGH VELOCITY, LAYERS, MATERIALS, NUMERICAL ANALYSIS, RECTANGULAR BODIES, SOLIDS, SOLUTIONS(GENERAL), SURFACES, TEMPERATURE, TEMPERATURE GRADIENTS, THINNESS, WEAR, SHEAR STRESSES, SURFACE TEMPERATURE, THERMOMECHANICS

Subject Categories : Thermodynamics
      Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE