الفهرس 
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Abstract
In this thesies, the viscoelastic composite material and the structural of anisotropic bodies in the theory of viscoelasticity are presented. The soluation of viscoelastic problem can be obtained easily if we know the corresponding solution of the elastic one. Four problems of an infinite fiberreinforced viscoelastic composite material plate weakened by a traiangular hole are investigated. In Chapter 1: The basic equations for basic problems in anisotropic plate are introduced. The stress concentrations around triangular hole in an anisortopic plate have been investigated and the maximum stress in plywood and isotropic plates have been compared. Chapter 2: Concerned with the viscolastic composite material and the structural of an anisotropic body in viscoelasticity, and gives some method of theory of viscoelasticity. In Chapter 3: Four problems of an infinite fiberreinforced viscoelastic plate with a triangular opening are discussed. The first two problems are when the plate is subjected to forces, which are perpendicular (or parallel) to one of the opening sides. The other problems are when the plate is subjected to loads, which are parallel (or perpendicular) to one of the sides of the opening. In all cases studied, the numerical results for stress concentration factors are given. The effects of time and constitutive parameters are investigated.