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Research Papers: Friction & Wear

Prediction of Erosion of Polyetherimide and Its Composites Using Response Surface Methodology

[+] Author and Article Information
Avinash A. Thakre

Assistant Professor
Department of Mechanical Engineering,
V.N.I.T,
Nagpur 440010, India
e-mails: aathakre@mec.vnit.ac.in; avinashathakre@gmail.com

Contributed by the Tribology Division of ASME for publication in the JOURNAL OF TRIBOLOGY. Manuscript received June 20, 2014; final manuscript received August 6, 2014; published online September 1, 2014. Assoc. Editor: George K. Nikas.

J. Tribol 137(1), 011603 (Sep 01, 2014) (7 pages) Paper No: TRIB-14-1142; doi: 10.1115/1.4028267 History: Received June 20, 2014; Revised August 06, 2014

This paper presents an approach to establish the model for predicting the steady-state erosion rate of polyetherimide and its glass fiber composites. Three-factor and two-level, face-centered composite design is used for experimentation. The parameters which affect the erosion rate are selected as glass fiber percentage (0–40%), impingement angle (30 deg–90 deg), and impact velocity (30–90 m/s). Response surface methodology is used to derive second-order quadratic model with interactions. Investigation showed all the parameters have significant effect on controlling steady-state erosion rate of these composites. The interactions of impact velocity-fiber percentage and impact velocity-impingement angle are significant. The increase in erosion rate with the increase in impact velocity is found to be satisfying a power law. Maximum erosion rate for these composites found at around 45 deg–60 deg impingement angle indicates their semiductile erosion behavior. Scanning electron microscopy photographs indicate ploughing, microcutting, development of cracks, and exposure of fibers as the dominating erosion mechanisms for these composites.

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Figures

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Fig. 1

Schematic diagram of erosion test rig [8]

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Fig. 2

Erosion rate of polyetherimide and its composites plotted against cumulative weight of impinging particles for different experimental conditions: (a) for α = 30 deg and v = 60 m/s, (b) for α = 60 deg and v = 60 m/s, (c) for α = 90 deg and v = 60 m/s, and (d) for α = 60 deg and v = 90 m/s

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Fig. 3

Main effects plot for steady-state erosion rate

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Fig. 4

Interaction plots for steady-state erosion rate (a) for fiber percentage and impingement angle, (b) for fiber percentage and impact velocity, and (c) for impingement angle and impact velocity

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Fig. 5

Scanning electron micrographs of eroded surfaces for (a) neat polymer at α = 60 deg and v = 90 m/s, (b) 20% glass fiber reinforced composite for α = 60 deg and v = 60 m/s, (c) 40% glass fiber reinforced composite for α = 30 deg and v = 90 m/s at 1500× , and (d) 40% glass fiber reinforced composite for α = 30 deg and v = 90 m/s at 1000×

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