Abstract
High-speed, high-resolution infrared thermography, as a noncontact, full-field, and nondestructive technique, was used to study the temperature variations of a cobalt-based ULTIMET alloy subjected to high-cycle fatigue. During each fatigue cycle, the temperature oscillations, which were due to the thermal-elastic-plastic effects, were observed and related to stress-strain analyses. A constitutive model was developed for predicting the thermal and mechanical responses of the ULTIMET alloy subjected to cyclic deformation. The model was constructed in light of internal-state variables, which were developed to characterize the inelastic strain of the material during cyclic loading. The predicted stress-strain and temperature responses were found to be in good agreement with the experimental results. In addition, the change of temperature during fatigue was employed to reveal the accumulation of fatigue damage, and the measured temperature was utilized as an index for fatigue-life prediction.
| Original language | English |
|---|---|
| Article number | 203 |
| Pages (from-to) | 2279-2296 |
| Number of pages | 18 |
| Journal | Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science |
| Volume | 32 |
| Issue number | 9 |
| DOIs | |
| State | Published - 2001 |
Funding
This work is supported by Haynes International, Inc. We also acknowledge the financial support of the National Science Foundation (NSF), the Division of Design, Manufacture, and Industrial Innovation, under Grant No. DMI-9724476, the Combined Research-Curriculum Development (CRCD) Program, under Grant No. EEC-9527527, and the Integrative Graduate Education and Research Training (IGERT) Program, under Grant No. DGE-9987548, to the University of Tennessee, Knoxville, with Dr. Delcie R. Durham, Ms. Mary F. Poats, Dr. Wyn Jennings, and Dr. Larry Goldberg, NSF, as program managers, respectively. This research is also financially made possible by the United States Department of Energy, Assistant Secretary for Energy Efficiency and Renewable Energy, Office of Transportation Technologies, as part of the High Temperature Materials Laboratory User Program under Contract No. DE-AC05-96OR22464, managed by Lockheed Martin Energy Research Corporation. We appreciate the financial support of the Center for Materials Processing, with Dr. Carl J. Mchargue as the director, and the Office of Research Administration, Dr. Ken R. Walker as the vice-chancellor, at the University of Tennessee, Knoxville. We are very fortunate to interact extensively with our colleagues, Mr. Bing Yang, Dr. Majid Kehani, Dr. Ralph Dinwiddie, Dr. Cam R. Hubbard, and Dr. Arvid R. Pasto. Many thanks are due to Mr. Douglas E. Fielden, Mr. Greg Jones, and Mr. Larry A. Smith, the University of Tennessee, for their great help in setting up the electrohydraulic machines and excellent technical support, and Mr. Randy Stooksbury and Mr. Frank Holiway for supplies.
| Funders | Funder number |
|---|---|
| Division of Design, Manufacture, and Industrial Innovation | DMI-9724476, EEC-9527527 |
| Haynes International, Inc. | |
| Integrative Graduate Education and Research Training | |
| Office of Research Administration | |
| Office of Transportation Technologies | |
| United States Department of Energy | |
| National Science Foundation | |
| Office of Energy Efficiency and Renewable Energy | |
| University of Tennessee |