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Research Papers

Failure Analysis of a Fibrous Composite Half-Space Subjected to Uniform Surface Line Load

[+] Author and Article Information
Suhasini Gururaja

 The Boeing Company, Seattle, WA 98195suhasini@u.washington.edu

Mamidala Ramulu

Department of Mechanical Engineering, University of Washington, Seattle, WA 98195ramulum@u.washington.edu

J. Eng. Mater. Technol 131(2), 021013 (Mar 09, 2009) (8 pages) doi:10.1115/1.3086386 History: Received December 02, 2007; Revised January 27, 2009; Published March 09, 2009

Unidirectional fiber-reinforced plastic (UD-FRP) laminates have been modeled previously as an equivalent quasihomogeneous monoclinic half-space subjected to an inclined line load on the surface using Lekhnitskii’s formulation simulating the orthogonal edge trimming loads in UD-FRPs. In continuation, failure analysis of the aforementioned composite half-space has been carried out in the present investigation based on Tsai–Wu criterion. In particular, the failure behavior of the half-space laminate with respect to the fiber orientation, load inclination angle, and spatial coordinates has been examined in detail. The motivation behind such a study lies in correlating the failure behavior of the half-space laminate with the machining damage observed during orthogonal edge trimming experiments. The present work strives at identifying this relationship and, in the process, understanding the physics of orthogonal cutting of UD-FRP laminates.

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Copyright © 2009 by American Society of Mechanical Engineers
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Figures

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Figure 1

Edge trimming model: (a) cutting process, (b) line load uniform along the z-axis, and (c) Cartesian coordinate definition

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Figure 2

Tsai–Wu contour plots for a constant vertical load (α=0 deg) of 80 N acting on UD-CFRP laminate (properties given in earlier section) with (a) θ=0 deg, (b) θ=90 deg, (c) θ=45 deg,and (d) θ=135 deg

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Figure 3

Stresses in-front and behind the load in the subsurface for a 0 deg laminate, α=90 deg

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Figure 4

Tsai–Wu contour plots for a constant shear load (α=90 deg) of 80 N acting on UD-CFRP laminate (properties given in earlier section) with (a) θ=0 deg, (b) θ=90 deg, (c) θ=45 deg, and (d) θ=135 deg

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Figure 5

Tsai–Wu contour plots for a constant inclined load (α=45 deg) of 80 N acting on UD-CFRP laminate (properties given in earlier section) with (a) θ=0 deg, (b) θ=90 deg, (c) θ=45 deg, and (d) θ=135 deg

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Figure 6

Typical side view of the UD-GFRP machined surfaces for a tool rake of 20 deg, a cutting speed of 3 m/min, and a depth of cut of 0.051 mm (4)

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Figure 7

Failure zone for a 0 deg laminate under a normal load

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Figure 8

Comparison of failure zone areas for different αs

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Figure 9

Cutting forces in edge trimming of 4 mm thick Gr/Ep laminate of 4 mm thickness using a 10 deg rake/17 deg clearance PCD tool with a depth of cut=0.25 mm and cutting speed=4 m/min(2)

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