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Research Papers

A Modified Closed Form Energy Based Framework for Axial Isothermal-Mechanical Fatigue Life Assessment for Aluminum 6061-T6

[+] Author and Article Information
M.-H. Herman Shen

Professor
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,
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 137(3), 031007 (Jul 01, 2015) (5 pages) Paper No: MATS-15-1001; doi: 10.1115/1.4030340 History: Received January 01, 2015; Revised April 02, 2015; Online May 06, 2015

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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References

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Wertz, J., Letcher, T., Shen, M.-H. H., Scott-Emuakpor, O., George, T., and Cross, C., 2011, “An Energy-Based Axial Isothermal-Mechanical Fatigue Lifing Method,” ASME J. Eng. Gas Turbines Power, 134(10), p. 102502. [CrossRef]
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Shen, M.-H., and Akanda, S. R., 2014, “A Modified Closed Form Energy Based Framework for Fatigue Life Assessment for Aluminum 6061-T6—Damaging Energy Approach,” ASME J. Eng. Mater. Technol., 137(2), p. 021008. [CrossRef]
Shen, M.-H. H., and Akanda, S. R., 2015, “An Energy-Based Framework to Determine the Fatigue Strength and Ductility Parameters for Life Assessment of Turbine Materials,” ASME J. Eng. Gas Turbines Power, 137(7), p. 072503. [CrossRef]

Figures

Grahic Jump Location
Fig. 1

(a) A representative hysteresis loop of average damaging energy developed due to isothermal-mechanical fully reversed axial fatigue test at any elevated temperature T and (b) the hysteresis loop in (a) shifted to the origin of axes [16]

Grahic Jump Location
Fig. 2

Evolution of (a) cyclic plastic strain range and (b) damaging energy of aluminum 6061-T6 at different temperatures. The stress amplitude was 241 MPa and test frequency was 0.1 Hz [14].

Grahic Jump Location
Fig. 3

Variation of cyclic parameters with temperature

Grahic Jump Location
Fig. 4

Experimental and predicted stress-life curves at: (a) 25 °C, (b) 75 °C, (c) 100 °C, and (d) 125 °C

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