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research-article

Application of Non-Interaction Constitutive Models for Deformation of IN617 under Combined Extreme Environments

[+] Author and Article Information
Thomas Bouchenot

Department of Mechanical and Aerospace Engineering, University of Central Florida, Orlando, Florida 32816
thomas.bouchenot@knights.ucf.edu

Calvin Cole

Department of Mechanical and Aerospace Engineering, University of Central Florida, Orlando, Florida 32816
carl.cole18@Knights.ucf.edu

Ali Gordon

ASME Member, Associate Professor, Department of Mechanical and Aerospace Engineering, University of Central Florida, Orlando, Florida 32816
ali.gordon@ucf.edu

Casey Holycross

Air Force Research Laboratory, Wright-Patterson AFB, OH 45433
casey.holycross@us.af.mil

Ravi / C Penmetsa

Air Force Research Laboratory, Wright-Patterson AFB, OH 45433
ravi.penmetsa@us.af.mil

1Corresponding author.

ASME doi:10.1115/1.4040223 History: Received November 05, 2017; Revised April 29, 2018

Abstract

Next-generation, reusable hypersonic aircraft will be subjected to extreme environments that produce complex fatigue loads at high temperatures, reminiscent of the life-limiting thermal and mechanical loads present in large gas-powered land-based turbines. In both of these applications, there is a need for greater fidelity in the constitutive material models employed in finite-element (FE) simulations, resulting in the transition to non-linear formulations. One such formulation is the non-linear kinematic hardening (NLKH) model, which is a plasticity model quickly gaining popularity in the industrial sector, and can be found in commercial FE software. The drawback to using models like the NLKH model is that the parameterization can be difficult, and the numerical fitting techniques commonly used for such tasks may result in constants devoid of physical meaning. This study presents a simple method to derive these constants by extrapolation of a reduced-order model, where the cyclic Ramberg-Osgood formulation is used to obtain the parameters of a three-part NLKH model. This fitting scheme is used with basic literature-based data to fully characterize a constitutive model for Inconel 617 at temperatures between 20°C to 1000°C. This model is validated for low-cycle fatigue, creep-fatigue, thermomechanical fatigue, and combined thermomechanical-high-cycle fatigue using a mix of literature data and original data produced at the Air Force Research Laboratory.

Copyright (c) 2018 by ASME
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