In the present investigation, the applicability of a previously developed closed form energy based framework to predict low cycle fatigue (LCF) life of aluminum 6061-T6 was extended from room temperature to elevated temperature. The three different elevated temperatures considered in the present investigation were 75 °C, 100 °C, and 125 °C which were below the creep activation temperature for aluminum 6061-T6. Like the room temperature life assessment framework, the elevated temperature life assessment framework involved computation of the Ramberg–Osgood cyclic parameters from the average plastic strain range and the average plastic energy obtained from an axial isothermal-mechanical fatigue (IMF) test. The temperature dependent cyclic parameters were computed for 25 °C (room temperature), 75 °C, and 100 °C and then extrapolated to 125 °C utilizing functions describing the dependence of the cyclic parameters on temperature. For aluminum 6061-T6, the cyclic parameters were found to decrease with increase of temperature in a quadratic fashion. Furthermore, the present energy based axial IMF framework was found to be able to predict the LCF life of aluminum 6061-T6 at both room and elevated temperatures with excellent accuracy.
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July 2015
Research-Article
A Modified Closed Form Energy Based Framework for Axial Isothermal-Mechanical Fatigue Life Assessment for Aluminum 6061-T6
M.-H. Herman Shen
,
M.-H. Herman Shen
1
Professor
Fellow ASME
Department of Mechanical and
Aerospace Engineering,
e-mail: shen.1@osu.edu
Fellow ASME
Department of Mechanical and
Aerospace Engineering,
The Ohio State University
,201 W. 19th Avenue
,Columbus, OH 43210
e-mail: shen.1@osu.edu
1Corresponding author.
Search for other works by this author on:
Sajedur R. Akanda
Sajedur R. Akanda
Department of Mechanical and
Aerospace Engineering,
e-mail: akanda.2@buckeyemail.osu.edu
Aerospace Engineering,
The Ohio State University
,201 W. 19th Avenue
,Columbus, OH 43210
e-mail: akanda.2@buckeyemail.osu.edu
Search for other works by this author on:
M.-H. Herman Shen
Professor
Fellow ASME
Department of Mechanical and
Aerospace Engineering,
e-mail: shen.1@osu.edu
Fellow ASME
Department of Mechanical and
Aerospace Engineering,
The Ohio State University
,201 W. 19th Avenue
,Columbus, OH 43210
e-mail: shen.1@osu.edu
Sajedur R. Akanda
Department of Mechanical and
Aerospace Engineering,
e-mail: akanda.2@buckeyemail.osu.edu
Aerospace Engineering,
The Ohio State University
,201 W. 19th Avenue
,Columbus, OH 43210
e-mail: akanda.2@buckeyemail.osu.edu
1Corresponding author.
Contributed by the Materials Division of ASME for publication in the JOURNAL OF ENGINEERING MATERIALS AND TECHNOLOGY. Manuscript received January 1, 2015; final manuscript received April 2, 2015; published online May 6, 2015. Assoc. Editor: Peter W. Chung.
J. Eng. Mater. Technol. Jul 2015, 137(3): 031007 (5 pages)
Published Online: July 1, 2015
Article history
Received:
January 1, 2015
Revision Received:
April 2, 2015
Online:
May 6, 2015
Citation
Herman Shen, M., and Akanda, S. R. (July 1, 2015). "A Modified Closed Form Energy Based Framework for Axial Isothermal-Mechanical Fatigue Life Assessment for Aluminum 6061-T6." ASME. J. Eng. Mater. Technol. July 2015; 137(3): 031007. https://doi.org/10.1115/1.4030340
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