Thermal constriction resistance of sphere/layered flat contacts: Theory and experiment

Journal Article · Mon May 01 04:00:00 EDT 1989 · Journal of Heat Transfer (Transactions of the ASME (American Society of Mechanical Engineers), Series C); (United States)

DOI:https://doi.org/10.1115/1.3250671· OSTI ID:6069206

Fisher, N J ^[1]; Yovanovich, M M ^[2]

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1. Atomic Energy of Canada Ltd., Chalk River, Ontario (Canada)
2. Univ. of Waterloo, Ontario (Canada)

The effect of surface layers on the thermal constriction resistance of contacts is of interest to the thermal analyst. This paper investigates analytically and experimentally the thermomechanical problem of a sphere in elastic contact with a flat plate coated with a layer. An approximate solution is developed that utilizes the solution to the thermal portion of the problem and the Hertzian limits of the mechanical portion. The approximation shows good agreement with the full solution for two examples that represent extremes in elastic properties for common metallics. Thermal constriction resistance measurements for a steel sphere contacting a nickel flat coated with a silver layer are compared to theoretical predictions. Resistance predictions from both full and approximate solutions show good agreement with measurements for light loads within the elastic load range. For heavy loads, the resistance is over-predicted due to plastic yielding of the nickel substrate.

• OSTI ID: 6069206
• Journal Information: Journal of Heat Transfer (Transactions of the ASME (American Society of Mechanical Engineers), Series C); (United States), Journal Name: Journal of Heat Transfer (Transactions of the ASME (American Society of Mechanical Engineers), Series C); (United States) Vol. 111:2; ISSN 0022-1481; ISSN JHTRA
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
420400* -- Engineering-- Heat Transfer & Fluid Flow
ALLOYS
COMPARATIVE EVALUATIONS
CONTRACTION
DATA
ELECTRONIC CIRCUITS
ELEMENTS
EVALUATION
EXPERIMENTAL DATA
INFORMATION
IRON ALLOYS
IRON BASE ALLOYS
METALS
NICKEL
NUMERICAL DATA
NUMERICAL SOLUTION
PHYSICAL PROPERTIES
PLATES
SILVER
SPHERES
STEELS
SURFACES
THERMAL CONDUCTIVITY
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENTS