Research Papers

Interference-Fit Effect on Improving Bearing Strength and Fatigue Life in a Pin-Loaded Woven Carbon Fiber-Reinforced Plastic Laminate

[+] Author and Article Information
Sang-Young Kim

Department of Mechanical Engineering,
Kunsan National University,
558 Daehak Road,
Gunsan 54150, South Korea

Dave Kim

School of Engineering and Computer Science,
Washington State University,
14204 NE Salmon Creek Avenue,
Vancouver, WA 98686
e-mail: kimd@wsu.edu

1Corresponding author.

Contributed by the Materials Division of ASME for publication in the JOURNAL OF ENGINEERING MATERIALS AND TECHNOLOGY. Manuscript received October 12, 2017; final manuscript received September 26, 2018; published online December 20, 2018. Assoc. Editor: Erdogan Madenci.

J. Eng. Mater. Technol 141(2), 021006 (Dec 20, 2018) (7 pages) Paper No: MATS-17-1302; doi: 10.1115/1.4041715 History: Received October 12, 2017; Revised September 26, 2018

This paper presents an experimental investigation on the effect of interference-fit on the bearing strength and fatigue life of pin-loaded plain-woven and cross ply carbon fiber-reinforced plastic laminate (CFRP). Stainless steel pins are installed to five different sized holes on the CFRP specimens to achieve transition-fit and four interference-fits (0.2%, 0.4%, 0.6%, and 1.0%). The quasi-static and fatigue (R = 0.1) properties of the pin-loaded CFRP are then compared to each other. From the experimental results, it is demonstrated that the interference-fit can improve the joint stiffness per unit bearing area, or the joint stiffness, under both the static and dynamic bearing load conditions. The ultimate bearing strength, fatigue life, and joint stiffness of interference-fit samples are higher than those of the transition-fit samples and they are maximized at an interference-fit percentage of 0.4%. Regardless of interference-fit percentage, the fatigue life of a pin-loaded CFRP specimen tends to be proportional to its joint stiffness in the beginning of a fatigue test. During fatigue testing, the joint stiffness of pin-loaded CFRP gradually decreases to the range of 18.8 GPa/mm to 18.6 GPa/mm when bearing failure occurs. The increased joint stiffness by interference-fit delays CFRP hole damage growth by reducing pin displacement under fatigue cycles.

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Fig. 1

Carbon fiber-reinforced plastic specimen geometries (unit: mm)

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Fig. 2

Measured average hole diameter and roundness with standard deviations depending on interference fit %

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Fig. 3

Photos of pin insertion fixture and pin installation process

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Fig. 4

Typical pin insertion force versus driving displacement for each Interference fit

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Fig. 5

Average maximum pin insertion force versus interference fit percentage with standard deviation

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Fig. 6

Typical bearing stress–pin displacement curves

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Fig. 7

Interference fit percentage versus joint stiffness per unit bearing area and maximum pin insertion force

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Fig. 8

Interference-fit versus cycles to failure (arrows indicate run-out specimens)

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Fig. 9

Effect of fatigue cycles on the applied load versus pin displacement curves

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Fig. 10

The joint stiffness per unit bearing area versus fatigue cycles

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Fig. 11

The relation between the average initial joint stiffness per unit area of fatigue tests and the fatigue life (the error bars indicate the range of the data)



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