Analytical Studies of Contact of Nominally Flat Surfaces; Effect of Previous Loading

1971 ◽  
Vol 93 (4) ◽  
pp. 451-456 ◽  
Author(s):  
B. Mikic
Keyword(s):  
Size Distribution ◽  
Contact Area ◽  
Thermal Contact ◽  
Thermal Contact Conductance ◽  
Contact Conductance ◽  
Flat Surfaces ◽  
Analytical Studies ◽  
Previous Loading

This work analytically investigates effect of previous loading on contact area, number of contact prints, their size distribution, and the value of thermal contact conductance for two nominally flat surfaces in contact. The model used in the analysis assumes that the surfaces are Gaussian and that in the first loading deformation of the surface asperities is plastic.

Thermal Contact Conductance of Packed Beds in Contact With a Flat Surface

1988 ◽  
Vol 110 (1) ◽  
pp. 38-41 ◽  
Author(s):  
G. P. Peterson ◽  
L. S. Fletcher
Keyword(s):  
Experimental Investigation ◽  
Stainless Steel ◽  
Thermal Contact ◽  
Spherical Particles ◽  
Thermal Contact Conductance ◽  
Packed Beds ◽  
Contact Conductance ◽  
Analytical Expression ◽  
Flat Surfaces ◽  
Stainless Steel 304

An experimental investigation was conducted to determine the thermal contact conductance of packed beds of spherical particles in contact with flat surfaces. Beds comprised of four materials, Aluminum 2017-T4, Yellow Brass, Stainless Steel 304, and Chromium Alloy AISI 52100, all in contact with flat Stainless Steel 304, surfaces were evaluated in a vacuum environment, at a mean interface temperature of 66°C. In addition to the experimental program, an analytical expression was developed by combining previous work performed by other investigators. The results of the experimental investigation are compared with the analytical expression and indicate that an accurate method of predicting the thermal contact conductance at the interface between beds of spherical particles and nominally flat surfaces has been identified.

A model of thermal contact conductance at high real contact area fractions

Wear ◽  
2010 ◽  
Vol 268 (1-2) ◽  
pp. 77-85 ◽  
Author(s):  
Przemysław Sadowski ◽  
Stanisław Stupkiewicz
Keyword(s):  
Contact Area ◽  
Thermal Contact ◽  
Thermal Contact Conductance ◽  
Real Contact Area ◽  
Contact Conductance ◽  
Real Contact

FEA-Based Numerical Simulation and Theoretical Modeling for Predicting Thermal Contact Conductance

2018 ◽  
pp. 118-139
Author(s):  
Sachin Rana
Keyword(s):  
Surface Roughness ◽  
Contact Area ◽  
Loading Condition ◽  
Thermal Contact ◽  
Thermal Contact Conductance ◽  
Real Contact Area ◽  
Fem Model ◽  
Contact Conductance ◽  
Real Contact ◽  
Fine Mesh

The chapter states the problem of thermal contact conductance between surfaces. Rough surface generation and thermal contact conductance has been simulated using Finite Element Method (FEM) based Ansys. The resulting geometry is meshed by different meshing method to convert the solid model into FEM model. The main aim of meshing is to create fine and coarse mesh at the contact to reduce the computational time. To create a fine mesh at contact free meshing with refinement and mapped mesh has been used. The analysis has been performed on the FEM model with varying loading condition of different surface roughness and different materials to get the real contact area and thus thermal contact conductance. The variation of thermal contact conductance and real contact area with pressure of different surface roughness and with surface roughness of different loading condition of the specimen made of aluminum and mild steel has been plotted and compared.

Thermal Contact Resistance Modeling of Non-Flat, Roughened Surfaces With Non-Metallic Coatings

2000 ◽  
Vol 123 (1) ◽  
pp. 11-23 ◽  
Author(s):  
E. E. Marotta ◽  
L. S. Fletcher ◽  
Thomas A. Dietz
Keyword(s):  
Contact Resistance ◽  
Thermal Contact Resistance ◽  
Thermal Contact ◽  
Thermal Contact Conductance ◽  
Metallic Coatings ◽  
Thermomechanical Model ◽  
Contact Conductance ◽  
Flat Surfaces ◽  
Resistance Modeling ◽  
Aluminum Substrates

Essentially all models for prediction of thermal contact conductance or thermal contact resistance have assumed optically flat surfaces for simplification. A few thermal constriction models have been developed which incorporate uncoated, optically non-flat surfaces based on the bulk mechanical properties of the material. Investigations have also been conducted which incorporate the thermophysical properties of metallic coatings and their effective surface microhardness to predict the overall thermal contact conductance. However, these studies and subsequent models have also assumed optically flat surfaces; thus, the application of these models to optically non-flat, coated surface conditions is not feasible without modifications. The present investigation develops a thermomechanical model that combines both microscopic and macroscopic thermal resistances for non-flat, roughened, surfaces with non-metallic coatings. The thermomechanical model developed as a result of this study predicts the thermal contact resistance of several non-metallic coatings deposited on metallic aluminum substrates quite well.

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