Equivalent Time Temperature Model for Physical Aging and Temperature Effects on Polymer Creep and Relaxation

[+] Author and Article Information
Ever J. Barbero

Mechanical and Aerospace Engineering, West Virginia University, Morgantown, WV 26506-6106

Kevin J. Ford

Mechanical and Aerospace Engineering, West Virginia University

J. Eng. Mater. Technol 126(4), 413-419 (Nov 09, 2004) (7 pages) doi:10.1115/1.1789956 History: Received June 21, 2003; Revised February 19, 2004; Online November 09, 2004
Copyright © 2004 by ASME
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Classical shift from 40°C to 21°C of data containing aging does not overlap actual data at 21°C having the same initial age and test duration, PVC
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CBT fixture in the “loading” condition
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Side view of CBT fixture during testing. Note the rubber band holding the specimen and, behind it, the knife with spar-and-scale assembly.
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Creep Banding Testing (CBT) fixture schematic showing the four point bending configuration and the operation of the “knife”
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Compliance curves for various increasing aging times te, PVC
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Set of rotated compliance curves for various ages and resulting master curve at teR=4513 Hr, PVC
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Set of compliance curves for various temperatures and resulting master curve at TR=21°C, PVC
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Temperature shift factor plot, PVC
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TTSP master curve, prediction, and data at te=1 Hr, 21°C, PVC
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Comparison of classical and ETT shifting of short-term and long-term data (PVC, 21°C, te=2,160 Hr)




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