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RESEARCH PAPERS

The Thermo-Viscoelastic, Viscoplastic Characterization of Vetrotex 324∕Derakane 510A-40 Through Tg

[+] Author and Article Information
Steven E. Boyd

Materials Response Group, Department of Engineering Science & Mechanics, Virginia Polytechnic Institute and State University, Blacksburg, VA 24061sboyd@vt.edu

John J. Lesko

Materials Response Group, Department of Engineering Science & Mechanics, Virginia Polytechnic Institute and State University, Blacksburg, VA 24061jlesko@vt.edu

Scott W. Case

Materials Response Group, Department of Engineering Science & Mechanics, Virginia Polytechnic Institute and State University, Blacksburg, VA 24061scase@vt.edu

J. Eng. Mater. Technol 128(4), 586-594 (Apr 13, 2006) (9 pages) doi:10.1115/1.2345451 History: Received October 20, 2005; Revised April 13, 2006

The increased use of fiber reinforced plastics (FRPs) in ship topside structures necessitates the need to understand how such structures respond to fire exposure. For this reason we have characterized the nonlinear, thermo-viscoelastic behavior of Vetrotex 324∕Derakane 510A-40 using tensile loading of [±45]2S laminates. Nonlinearity is observed at elevated stress and temperatures above Tg. The data reduction sufficiently modeled the experimental master-curves over the whole temperature range, but suffered from inconsistencies in the creep data and recovery data, perhaps due to accumulated damage during the creep cycle. Our results indicate that the nonlinear viscoelastic behavior significantly contributes to structural behavior under fire loading conditions.

Copyright © 2006 by American Society of Mechanical Engineers
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Figures

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Figure 1

Typical temperature master-curves for V324∕Derakane 510A-40

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Figure 2

Stress master-curve at 90°C with fit model (dashed line)

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Figure 3

Temperature shift factor aT for the reference master-curve

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Figure 4

Low stress creep and creep recovery data at 110°C together with corresponding predictions from linear viscoelastic theory

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Figure 5

The viscoplastic permanent sets versus temperature and stress together with the power law predictions. (Note the dramatic increase in the leathery and rubbery regions.)

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Figure 6

The viscoplastic permanent set versus varying creep times at 150°C and σ=200psi(1.38MPa). (This fit is interdependent with the elevated stresses at t1=120min.)

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Figure 7

The shear modulus G12 versus temperature for V324∕Derakane 510A-40

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Figure 8

Typical creep data for 110°C (fit model is represented by the dashed lines)

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Figure 9

Typical recovery data at 110°C (fit model is represented by the dashed lines)

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Figure 10

Schapery nonlinear parameter g0 versus stress in the glassy region

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Figure 11

Schapery nonlinear parameter g1 versus stress and temperature in the leathery to rubbery regions

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Figure 12

The stress shift factor aσ versus stress and temperature

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Figure 13

The average value of Zapas-Crissman parameter n versus temperature

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Figure 14

The Zapas-Crissman coefficient Cn versus temperature

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Figure 15

The Zapas-Crissman exponent N versus temperature

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Figure 16

The temperature master-curve for σ=200psi(1.38MPa) with fit model (dashed line)

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