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首页> 美国政府科技报告 >Temperature Field in the Vicinity of a Near-Surface Void Due to High-Speed Friction Load
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Temperature Field in the Vicinity of a Near-Surface Void Due to High-Speed Friction Load

机译：高速摩擦载荷对近地表空隙附近的温度场

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摘要

The present investigation expounds 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.

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