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Calorimetric Measurement of the Plastic Vtork of Fatigue Crack Propagation in 4140 Steel

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Abstract

A calorimetric technique has been developed for measurement of the effective surface energy of fatigue crack propagation,U, and the cyclic plastic work in the plastic zone,Q. The technique has several distinct advantages over existing methods. Measurements on 4140 steel (650 °C temper) show thatU andQ are direct functions of the stress intensity factor,hK, and indirect functions of crack growth rate,daldN. Measurement of the change ofU andQ after the application of a tensile overload supports this conclusion and provides strong evidence supporting crack closure theories.

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Authors and Affiliations

  1. Department of Metallurgical Engineering and Materials Science, University of Kentucky, 40506, Lexington, KY

    TODD S. GROSS (Assistant Professor)

  2. Department of Geological Science, Northwestern University, 60201, Evanston, IL

    JOHANNES WEERTMAN (Walter P. Murphy Professor of Materials Science and Engineering and Materials Research Center, and Professor of Geophysics)

Authors
  1. TODD S. GROSS
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  2. JOHANNES WEERTMAN
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Formerly with the Materials Science and Engineering Department and Materials Research Center, Northwestern University, Evanston, IL.

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GROSS, T.S., WEERTMAN, J. Calorimetric Measurement of the Plastic Vtork of Fatigue Crack Propagation in 4140 Steel. Metall Trans A 13, 2165–2172 (1982). https://doi.org/10.1007/BF02648386

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  • DOI: https://doi.org/10.1007/BF02648386

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