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Poisson's Ratio as a Function of Time in Composite Material of Viscoelastic Behavior by Depending on Creep Test

Author: Azhar Sabah Ameed
Journal: Engineering and Technology Journal مجلة الهندسة والتكنولوجيا ISSN: 16816900 24120758 Year: 2011 Volume: 29 Issue: 3 Pages: 488-498
Publisher: University of Technology الجامعة التكنولوجية

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Abstract

In viscoelastic behavior of composite material, such as those made of thermo-setpolyester and one layer random fiber glass, the Poisson’s ratio is described in newfunction of time and stress. The relaxation stress is obtained experimentally to describethe non-linear viscoelastic behavior in composite material. The results show that,Poisson’s ratio increases with an approximate rate of 16% as a result of the increasingstress from 6.877 MPa to 8.239 MPa and decreases with increasing the time at constanttemperature 30 Co.The investigation demonstrated that such time dependence is not a necessaryconsequence of the theory of viscoelasticity to describe viscoelasticity behavior.

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