Directionally solidified (DS) Ni-base superalloys are commonly used as gas turbine materials to primarily extend the operational lives of components under high load and temperature. The nature of DS superalloy grain structure facilitates an elongated grain orientation, which exhibits enhanced impact strength, high temperature creep and fatigue resistance, and improved corrosion resistance compared with off-axis orientations. Of concern to turbine designers are the effects of cyclic fatigue, thermal gradients, and potential stress concentrations when dealing with orientation-dependent materials. When coupled with a creep environment, accurate prediction of crack initiation and propagation becomes highly dependent on the quality of the constitutive damage model implemented. This paper describes the development of an improved anisotropic tertiary creep damage model implemented in a general-purpose finite element analysis software. The creep damage formulation is a tensorial extension of a variation in the Kachanov–Rabotnov isotropic tertiary creep damage formulation. The net/effective stress arises from the use of the Rabotnov second-rank symmetric damage tensor. The Hill anisotropic behavior analogy is used to model secondary creep and tertiary creep damage behaviors. Using available experimental data for a directionally solidified Ni-base superalloy, the improved formulation is found to accurately model intermediate oriented specimen.
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October 2011
Research Papers
An Improved Anisotropic Tertiary Creep Damage Formulation
Calvin M. Stewart,
Calvin M. Stewart
Department of Mechanical, Materials, and Aerospace Engineering,
University of Central Florida
, Orlando, FL 32816-2450
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Ali P. Gordon,
Ali P. Gordon
Department of Mechanical, Materials, and Aerospace Engineering,
University of Central Florida
, Orlando, FL 32816-2450
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Young Wha Ma,
Young Wha Ma
Department of Mechanical Engineering,
Chung Ang University
, 221 Huksuk Dongjak, Seoul 156-756, Korea
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Richard W. Neu
Richard W. Neu
George W. Woodruff School of Mechanical Engineering,
Georgia Institute of Technology
, Atlanta, GA 30332-0405
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Calvin M. Stewart
Department of Mechanical, Materials, and Aerospace Engineering,
University of Central Florida
, Orlando, FL 32816-2450
Ali P. Gordon
Department of Mechanical, Materials, and Aerospace Engineering,
University of Central Florida
, Orlando, FL 32816-2450
Young Wha Ma
Department of Mechanical Engineering,
Chung Ang University
, 221 Huksuk Dongjak, Seoul 156-756, Korea
Richard W. Neu
George W. Woodruff School of Mechanical Engineering,
Georgia Institute of Technology
, Atlanta, GA 30332-0405J. Pressure Vessel Technol. Oct 2011, 133(5): 051201 (10 pages)
Published Online: July 11, 2011
Article history
Received:
March 18, 2010
Revised:
August 13, 2010
Online:
July 11, 2011
Published:
July 11, 2011
Citation
Stewart, C. M., Gordon, A. P., Ma, Y. W., and Neu, R. W. (July 11, 2011). "An Improved Anisotropic Tertiary Creep Damage Formulation." ASME. J. Pressure Vessel Technol. October 2011; 133(5): 051201. https://doi.org/10.1115/1.4002497
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