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TECHNICAL PAPERS: Analytical and Experimental Techniques

A Photothermal Technique for the Determination of the Thermal Conductance of Interfaces and Cracks

[+] Author and Article Information
K. R. McDonald, J. R. Dryden, A. Majumdar, F. W. Zok

Materials Department, University of California, Santa Barbara, CA 93106

J. Heat Transfer 122(1), 10-14 (Oct 13, 1999) (5 pages) doi:10.1115/1.521430 History: Received December 09, 1998; Revised October 13, 1999
Copyright © 2000 by ASME
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Figures

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Schematic of the experimental technique
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(a) Schematic of the specimen and loading geometry used to cause delamination of the Nicalon/MAS composite specimen and subsequently determine the crack conductance; (b) optical micrograph of a typical delamination crack; (c) higher magnification view of the crack showing bridging by an inclined fiber
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Phase lag measurements made on pristine steel specimen and the corresponding calculations from the analysis presented in Ohsone et al. 1. The error bars represent the maximum uncertainty in Δϕ, (0.017 rad), based on many repeat measurements under the same test conditions. The solid curves were calculated using the reported thermal diffusivity of the steel alloy, whereas the dotted curves represent calculations for thermal diffusivities that are either eight percent higher or lower than the reported value.
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Experimental data and calculated curves for the stainless steel sandwich specimens, showing the effects of the polyethylene sheets on (a) the phase lag, Δϕi, associated with the interface itself, and (b) the interface conductance. The error bars in (b) represent the range of conductances needed to encompass the experimental data in (a). The solid line in (b) is a least-squares fit of the data for n=1, 2, and 4.
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Experimental data and calculated curves for the Nicalon/MAS composite specimens showing the effects of crack opening displacement on (a) the additional phase lag, Δϕc, and (b) the crack conductance. The error bars in (b) represent the range of conductances needed to encompass the experimental data in (a).

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