An Improved Anisotropic Tertiary Creep Damage Formulation

Author:

Stewart Calvin M.1,Gordon Ali P.1,Ma Young Wha2,Neu Richard W.3

Affiliation:

1. Department of Mechanical, Materials, and Aerospace Engineering, University of Central Florida, Orlando, FL 32816-2450

2. Department of Mechanical Engineering, Chung Ang University, 221 Huksuk Dongjak, Seoul 156-756, Korea

3. George W. Woodruff School of Mechanical Engineering, Georgia Institute of Technology, Atlanta, GA 30332-0405

Abstract

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.

Publisher

ASME International

Subject

Mechanical Engineering,Mechanics of Materials,Safety, Risk, Reliability and Quality

Reference42 articles.

1. Creep Damage Process of Ni-Base Superalloy Caused by Stress-Induced Anisotropic Atomic Diffusion;Suzuki;JSME Int. J., Ser. A

2. Coupled Inelasticity and Damage Model for Metal Matrix Composites;Kawai;Int. J. Damage Mech.

3. An Anisotropic Creep Damage Model for Anisotropic Weld Metal;Peravali;ASME J. Pressure Vessel Technol.

4. A Novel Anisotropic Tertiary Creep Damage Model for Transversely Isotropic Materials;Stewart

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