In this work, quasistatic crack initiation under mixed mode loading in planar (two-dimensional plane stress) functionally graded materials (FGMs) is studied. The goal of this work is to directly compare experiments and simulations so as to evaluate the applicability of the maximum tangential stress (MTS) criterion in predicting crack kinking in FGMs. Initially, crack initiation in the homogeneous material, which forms the basis of our FGM—polyethylene—is studied. The (generalized) maximum tangential stress is applied through the use of finite elements to determine crack initiation angles in the same graded configurations studied experimentally. Computational results of fracture parameters (stress intensity factors and -stress), and crack initiation angles are compared to experimental results and good agreement is obtained. It is seen that the MTS criterion is applicable to FGM crack initiation prediction if the inherent material gradient length scale is larger than the fracture process zone.
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September 2008
Special Issue Honoring Professor Fazil Erdogan’S Contributions To Mixed Boundary Value Problems Of Inhomogeneous And Functionally Graded Materials
Crack Initiation in Functionally Graded Materials Under Mixed Mode Loading: Experiments and Simulations
Alpay Oral,
Alpay Oral
Department of Mechanical Engineering,
Bogazici University
, 34342 Bebek, Istanbul, Turkey
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John Lambros,
John Lambros
Department of Aerospace Engineering,
University of Illinois
, Urbana-Champaign, Urbana, IL 61801
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Gunay Anlas
Gunay Anlas
Department of Mechanical Engineering,
Bogazici University
, 34342 Bebek, Istanbul, Turkey
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Alpay Oral
Department of Mechanical Engineering,
Bogazici University
, 34342 Bebek, Istanbul, Turkey
John Lambros
Department of Aerospace Engineering,
University of Illinois
, Urbana-Champaign, Urbana, IL 61801
Gunay Anlas
Department of Mechanical Engineering,
Bogazici University
, 34342 Bebek, Istanbul, TurkeyJ. Appl. Mech. Sep 2008, 75(5): 051110 (8 pages)
Published Online: July 11, 2008
Article history
Received:
June 29, 2007
Revised:
December 31, 2007
Published:
July 11, 2008
Citation
Oral, A., Lambros, J., and Anlas, G. (July 11, 2008). "Crack Initiation in Functionally Graded Materials Under Mixed Mode Loading: Experiments and Simulations." ASME. J. Appl. Mech. September 2008; 75(5): 051110. https://doi.org/10.1115/1.2936238
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