الفهرس 
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Abstract
In the last few years, some composite materials with high strength properties were discovered. Most of these materials are viscoelastic. Many researches have been carried out to study the mechanics, as well as the existials [6, 7, 11, 13]. One of the most important and elegant methods to solve quasistatic problems of the linear theory of viscoelasticity is the approximation method proposed by A. A. Illyushin[8].