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Technical Briefs

Mechanical Behavior of Random Fiber Composite Perforated Plates

[+] Author and Article Information
Michael Eggen, Susan C. Mantell, Jane H. Davidson

Department of Mechanical Engineering, University of Minnesota, 111 Church Street, S.E., Minneapolis, MN 55455

Assuming Em=2GPa, Ef=72.5GPa(11), typical l/d=35 reduced to l/d=17.5 when machined.

J. Pressure Vessel Technol 132(2), 024502 (Mar 30, 2010) (4 pages) doi:10.1115/1.4000723 History: Received January 16, 2009; Revised August 13, 2009; Published March 30, 2010; Online March 30, 2010

The mechanical behavior of perforated, chopped fiber reinforced polymer plates is measured in three point bend tests to determine if an equivalent elastic modulus can be applied to fiber filled perforated plates despite local areas of reduced stiffness surrounding each hole. Experimental values of the scaled effective elastic modulus E/E are obtained for a range of perforation geometries in unfilled and glass fiber reinforced polyamide 6,6 and polycarbonate thin plates. Data for nonreinforced and chopped fiber reinforced plates are indistinguishable and agree well with a finite element model for linear elastic isotropic materials. No compensation for the reduction in modulus near the perforations is required in the finite element model. It is also concluded that the equivalent elastic modulus approach is suitable for the prediction of bending deformation of machined random fiber composite plates.

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Copyright © 2010 by American Society of Mechanical Engineers
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Figures

Grahic Jump Location
Figure 1

Top and side views of a perforated plate with an equilateral triangular hole pattern. Shaded regions indicate the annular regions where mechanical properties are expected to be affected by the perforations.

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Figure 2

Finite element model loads and boundary conditions. A solid plate is shown.

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Figure 3

Comparison of measured and predicted values of E∗/E versus H/P for isotropic and glass fiber reinforced (GFR) polyamide 6,6 and polycarbonate. Finite element results are reported for the isotropic perforated plate case.

Grahic Jump Location
Figure 4

Reduction in E∗/E as a function of the volume reduction near the holes. Reduction is expressed as a fraction of the value for an isotropic perforated plate of the same geometry.

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