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Research Papers

Fatigue Tests on Aluminum Specimens Subjected to Constant and Random Amplitude Loadings

[+] Author and Article Information
Morteza Rahimi Abkenar

Department of Civil and
Environmental Engineering,
The George Washington University,
Washington, DC 20052
e-mail: rahimi_m@gwu.edu

David P. Kihl

Survivability, Structures and
Material Department,
United States Navy,
West Bethesda, MD 20817
e-mail: david.kihl@navy.mil

Majid T. Manzari

Department of Civil and
Environmental Engineering,
The George Washington University,
Washington, DC 20052
e-mail: manzari@gwu.edu

1Corresponding author.

Contributed by the Materials Division of ASME for publication in the JOURNAL OF ENGINEERING MATERIALS AND TECHNOLOGY. Manuscript received August 9, 2015; final manuscript received June 6, 2016; published online July 19, 2016. Assoc. Editor: Erdogan Madenci.This work is in part a work of the U.S. Government. ASME disclaims all interest in the U.S. Government's contributions.

J. Eng. Mater. Technol 138(4), 041013 (Jul 19, 2016) (7 pages) Paper No: MATS-15-1187; doi: 10.1115/1.4033898 History: Received August 09, 2015; Revised June 06, 2016

Increasing interest in using aluminum as the structural component of light-weight structures, mechanical devices, and ships necessitates further investigations on fatigue life of aluminum alloys. The investigation reported here focuses on characterizing the performance of cruciform-shaped weldments made of 5083 aluminum alloys in thickness of 9.53 mm (3/8 in.) under constant, random, and bilevel amplitude loadings. The results are presented as S/N curves that show cyclic stress amplitude versus the number of cycles to failure. Statistical procedures show good agreements between test results and predicted fatigue life of aluminum weldments. Moreover, the results are compared to the results obtained from previous experiments on aluminum specimens with thicknesses of 12.7 mm (1/2 in.) and 6.35 mm (1/4 in.).

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Figures

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Fig. 1

Specimen dimensions

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Fig. 2

A typical cruciform specimen

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Fig. 3

Typical cruciform specimen installed in the test machine

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Fig. 4

Specimen tension/compression stress–strain curve

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Fig. 5

Specimens after failure

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Fig. 6

Constant-amplitude S/N curve and data for cruciform specimens

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Fig. 7

Comparison of predicted and actual fatigue lives using a single-line S/N curve without an endurance limit

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Fig. 8

Comparison of predicted and actual fatigue lives using a single-line S/N curve with an endurance limit of 1 × 108 cycles

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