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Research Papers

Influence of Fabrication and Interference-Fit Techniques on Tensile and Fatigue Properties of Pin-Loaded Glass Fiber Reinforced Plastics Composites

[+] Author and Article Information
Sang-Young Kim

School of Engineering and Computer Science,  Washington State University, 14204 NE Salmon Creek Avenue, Vancouver, WA 98686

Daniel J. Hennigan

 U.S. Army, Fort Rucker, AL 36362

Dave (Dae-Wook) Kim1

Associate Professor of Mechanical Engineering School of Engineering and Computer Science,  Washington State University, 14204 NE Salmon Creek Avenue, Vancouver, WA 98686kimd@wsu.edu

1

Corresponding author.

J. Eng. Mater. Technol 134(4), 041012 (Sep 04, 2012) (8 pages) doi:10.1115/1.4007351 History: Received December 05, 2011; Revised August 01, 2012; Published September 04, 2012; Online September 04, 2012

This paper aims to investigate the effect of fabrication processes on fatigue life enhancement of interference-fit pin-loaded glass fiber reinforced plastics (GFRP) composites. In this experimental study, three GFRP composite fabrication processes are used: hand lay-up (HL), vacuum infusion (VI), and hybrid (hand lay-up + vacuum infusion) processes. Stainless steel pins with interference fits ranging from 0% to 1% are inserted into the GFRP samples. The quasi-static and fatigue properties of the pin-loaded composites with interference fit (0.6% and 1%) are then compared to samples with transition-fit (0% of interference fit). Even with possible local damage on the joints, interference fit does not degrade the performance of the composite joints under quasi-static loading, especially when kept under 1% of interference fit. However, fatigue life is highly related to the fabrication processes. Vacuum infusion processed GFRP samples show most visible fatigue life improvement due to interference fit, while hand lay-up or hybrid samples have moderate improvement. Fractography and failure mode of each sample are examined using microscopes.

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Copyright © 2012 by American Society of Mechanical Engineers
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Figures

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Figure 1

Quasi-static/fatigue sample size (unit = mm), Dp  = pin diameter, Dh  = hole diameter

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Figure 2

Photo of installation process with pin installation fixture

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Figure 3

Load versus displacement pin insertion force for each I %: (a) HL (b) VI, and (c) HYB

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Figure 4

Sectioned hole surface of each sample after drilling and pin installation (×50)

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Figure 5

Typical quasi-static curves: (a) HL (b) VI, and (c) HYB

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Figure 6

Interference-fit percentage versus cycles to failure (arrows indicate run-out specimens.): (a) HL (b) VI, and (c) HYB

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Figure 7

(a) A typical load versus pin displacement plot for a fatigue specimen, (b) an entire load displacement curve for a typical fatigue test, and (c) the pin displacement range versus fatigue cycles curve (HL, I = 0%)

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Figure 8

The joint stiffness per unit bearing area versus fatigue cycles: (a) HL (b) VI, and (c) HYB

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Figure 9

Fatigue failure characteristics of (a) HL (b) VI, and (c) HYB

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