Nucleation of fatigue cracks at nonmetallic primary inclusions in high cycle fatigue of martensitic steel is computationally investigated. We explore the capabilities of an elastic interphase material adhered to the inclusion surface to alter the driving force for fatigue crack nucleation in the matrix. By varying the elastic stiffness of the encapsulating interphase, the stresses and cyclic plastic strains are examined in the matrix in the proximity of a partially debonded inclusion, a worst case scenario for nucleation. The matrix is modeled as elastic-plastic with pure kinematic hardening expressed in a hardening minus dynamic recovery format. The inclusion and interphase are modeled as isotropic linear elastic. An idealized spherical, homogeneous inclusion is considered to facilitate parametric study. A nonlocal average value of the maximum plastic shear strain amplitude was used in a modified form of the Fatemi–Socie parameter in the proximity of inclusions as a fatigue indicator parameter to facilitate comparative parametric study of potency for crack nucleation.
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e-mail: david.mcdowell@me.gatech.edu
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January 2009
Research Papers
Modeling Effects of Compliant Coatings on HCF Resistance of Primary Inclusions in High Strength Steels
Rajesh Prasannavenkatesan,
Rajesh Prasannavenkatesan
George W. Woodruff School of Mechanical Engineering,
Georgia Institute of Technology
, Atlanta, GA 30332-0405
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David L. McDowell,
David L. McDowell
George W. Woodruff School of Mechanical Engineering, and School of Materials Science and Engineering,
e-mail: david.mcdowell@me.gatech.edu
Georgia Institute of Technology
, Atlanta, GA 30332-0405
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Gregory B. Olson,
Gregory B. Olson
Department of Materials Science and Engineering, Robert R. McCormick School of Engineering and Applied Science,
Northwestern University
, Evanston, IL 60208-3108; Questek Innovations LLC
, Evanston, IL 60201
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Herng-Jeng Jou
Herng-Jeng Jou
Questek Innovations LLC
, Evanston, IL 60201
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Rajesh Prasannavenkatesan
George W. Woodruff School of Mechanical Engineering,
Georgia Institute of Technology
, Atlanta, GA 30332-0405
David L. McDowell
George W. Woodruff School of Mechanical Engineering, and School of Materials Science and Engineering,
Georgia Institute of Technology
, Atlanta, GA 30332-0405e-mail: david.mcdowell@me.gatech.edu
Gregory B. Olson
Department of Materials Science and Engineering, Robert R. McCormick School of Engineering and Applied Science,
Northwestern University
, Evanston, IL 60208-3108; Questek Innovations LLC
, Evanston, IL 60201
Herng-Jeng Jou
Questek Innovations LLC
, Evanston, IL 60201J. Eng. Mater. Technol. Jan 2009, 131(1): 011012 (6 pages)
Published Online: December 22, 2008
Article history
Received:
June 18, 2008
Revised:
October 14, 2008
Published:
December 22, 2008
Citation
Prasannavenkatesan, R., McDowell, D. L., Olson, G. B., and Jou, H. (December 22, 2008). "Modeling Effects of Compliant Coatings on HCF Resistance of Primary Inclusions in High Strength Steels." ASME. J. Eng. Mater. Technol. January 2009; 131(1): 011012. https://doi.org/10.1115/1.3030943
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