Temperature field in the vicinity of a nearsurface void due to highspeed friction load
Abstract
The present investigation expound on the effect of a nearsurface cavity, when the solid surface is subjected to the Coulomb frictional loading of an asperity moving at moderately highspeed. 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 timeexplicit 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 surfacelayer/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.
 Publication:

NASA STI/Recon Technical Report N
 Pub Date:
 February 1987
 Bibcode:
 1987STIN...8724670J
 Keywords:

 Finite Difference Theory;
 Friction;
 Shear Stress;
 Solids;
 Surface Layers;
 Surface Temperature;
 Thermal Stresses;
 Thermodynamics;
 Voids;
 Coatings;
 Differential Equations;
 Heat Transfer;
 Loads (Forces);
 Temperature Distribution;
 Temperature Gradients;
 Wear;
 Fluid Mechanics and Heat Transfer