Effect of CO2 Saturation and Desorption on the Fatigue Life of Polycarbonate

[+] Author and Article Information
K. A. Seeler

Department of Mechanical Engineering, Lafayette College, Easton, PA 18042

Vipin Kumar

Department of Mechanical Engineering, University of Washington, Seattle, WA 98185

J. Eng. Mater. Technol 116(4), 451-456 (Oct 01, 1994) (6 pages) doi:10.1115/1.2904312 History: Received August 06, 1993; Online April 29, 2008


The effect of a cycle of CO2 saturation and desorption on the yield strength, Young’s modulus, and fatigue life of polycarbonate was investigated. The fatigue life of the saturation-cycled polycarbonate exceeded that of unprocessed polycarbonate by up to a factor of thirty. The fatigue life of these rough-surfaced saturation-cycled specimens was approximately equal to or greater than that of polished smooth bar specimens. The increase in fatigue life is a function of the CO2 saturation pressure, reaching a maximum at the same saturation pressure at which there is no further reduction in static yield strength. The increased fatigue life is hypothesized to result from one or more of following mechanisms: (1) reduction of shear strength promoting slow-growing shear fatigue cracks: (2) “healing” or blunting of pre-existing flaws or microcracks by swelling strain or by stress relief strain resulting from plasticization by CO2 during saturation.

Copyright © 1994 by The American Society of Mechanical Engineers
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