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RESEARCH PAPERS

Effects of Thermal Loading on Foil and Sheet Composites With Constituents of Differing Thermal Expansivities

[+] Author and Article Information
C. A. Hoffman

National Aeronautics and Space Administration, Lewis Research Center, Cleveland, Ohio

J. Eng. Mater. Technol 95(1), 47-54 (Jan 01, 1973) (8 pages) doi:10.1115/1.3443105 History: Received January 27, 1972; Online August 17, 2010

Abstract

A study was made to estimate the magnitudes of elastic stresses and elastic-plastic stresses and strains in sheet or foil laminar composites. Using a model tungsten/80Ni + 20Cr laminar composite and assuming cooling or heating through a temperature range of 80–2000 deg F (26.5–1093.5 deg C), calculated elastic stresses exceeded published or estimated strengths of the constituents. Elastic-plastic stress-strain solutions resulted in lower estimated stress levels but with the concomitant occurrence of sufficiently large strain ranges to suggest possible thermal fatigue problems. Limited experimental studies using tungsten/80Ni + 20Cr foil and sheet laminar composites, slowly cycled between 80 and 2000 deg F (26.5–1093.5 deg C) or rapidly cycled between 80 and 1600 deg F (26.5–871 deg C) produced varying degrees of observable structural damage in from 1 to 11 cycles depending upon temperature transition rate and laminae thickness; these particular results might not occur with other combinations of materials.

Copyright © 1973 by ASME
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