SEDL / STP / STP745-EB / STP28310S

Consequences of Varying Surface Heat Transfer Coefficients, Material Properties, and Cyclical Ambient Temperatures upon Stress Intensity Factors for Edge Cracks

Emery, AF
Professor, professor, and research assistant, University of Washington, Seattle, Wash.

Kobayashi, AS
Professor, professor, and research assistant, University of Washington, Seattle, Wash.

Bieler, TR
Professor, professor, and research assistant, University of Washington, Seattle, Wash.

Pages: 16    Published: Jan 1981

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Abstract

Stress intensity factors were calculated for an edge crack subjected to time varying surface heat transfer coefficients and to cyclical ambient temperatures. Both constant and varying material properties were used and values of K^I are presented as functions of crack depth and time. Substantial changes in the maximum values of K^I were noted for these different cases. In general, quench tests with specimens whose material properties increase with temperature show much lower values of K^I than do specimens with material properties which are either constant or decrease with temperature.