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Research Papers: JOINING

Clamp Load Decay Due to Material Creep of Lightweight-Material Joints Under Cyclic Temperature

[+] Author and Article Information
Sayed A. Nassar

Fellow ASME
Fastening and Joining Research Institute (FAJRI),
Oakland University,
Rochester, MI 48309
e-mail: nassar@oakland.edu

Amir Kazemi

Fastening and Joining Research Institute (FAJRI),
Oakland University,
Rochester, MI 48309

Contributed by the Manufacturing Engineering Division of ASME for publication in the JOURNAL OF MANUFACTURING SCIENCE AND ENGINEERING. Manuscript received November 27, 2014; final manuscript received February 12, 2015; published online September 4, 2015. Assoc. Editor: Edmund Chu.

J. Manuf. Sci. Eng 137(5), 051025 (Sep 04, 2015) (7 pages) Paper No: MANU-14-1636; doi: 10.1115/1.4029830 History: Received November 27, 2014

Experimental and finite element techniques are used for investigating the effect of cyclic thermal loading on the clamp load decay in preloaded single-lap bolted joints that are made of multimaterial lightweight alloys. Substrate material combinations include aluminum, magnesium, and steel, with various coupon thicknesses. The range of cyclic temperature profile varies between −20 °C and +150 °C in a computer-controlled environmental chamber for generating the desired cyclic temperature profile and durations. Real time clamp load data are recorded using strain gage-based, high-temperature, load cells. Clamp load decay is investigated for various combinations of joint materials, initial preload level, and substrate thickness. Thermal and material creep finite element analysis (FEA) is performed using temperature-dependent mechanical properties. The FEA model and results provided a valuable insight into the experimental results regarding the vulnerability of some lightweight materials to significant material creep at higher temperatures.

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Figures

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Fig. 1

Changes in bolt length (Lb) and grip length (Lc) due to thermal and preload effect

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Fig. 2

Test specimen thickness and material combinations for FEA and experimental setup

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Fig. 3

Illustration of cyclic temperature profile

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Fig. 10

Experimental and finite element data comparison

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Fig. 4

Clamp load versus thermal cycling time (similar material SLJ/high preload)

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Fig. 5

Clamp load versus thermal cycling time (dissimilar-material SLJ/high preload)

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Fig. 6

Normalized clamp load versus number of thermal cycles for steel-based joints

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Fig. 7

Normalized clamp load versus number of thermal cycles for aluminum-based joints

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Fig. 8

Normalized clamp load versus number of thermal cycles (magnesium-based SLJ)

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Fig. 9

Effect of initial clamp load level on clamp load decay due to creep

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