Due to the inadequacy of the analysis methods of composites, designers have had to take into account relatively high safety coefficients in designing composites. Consequently, most structures made of composites are produced with higher capacity than is needed. However, these materials can be used more effectively provided that behaviours, damage processes, and damage prevention methods are considered more meticulously. In this paper damage phenomenon in Laminates made of a layer of graphite - epoxy and glass - epoxy with different alignments layers under tension have been studied and compared using Finite element analysis (FEA). Maximum stress, strain, displacement and destruction number based on The Tsai-wu criteria in the most critical layers in every layout, in both materials has been obtained and compared together. It was found out that when the arrangement of layers is cross-ply, damage in Laminates is far lower than Quasi-orthotropic mode and the unsymmetrical mode (general laminate). Results also showed that the graphite - epoxy over glass - epoxy is more resistant against tensile. It can be finally concluded that in order to produce a Laminates when the Laminates is under tension Instead of using a high safety factor in designing which leads to higher product prices and resulting economic failure of product, economic competition with other competitor’s products can be obtained through correct material and arrangement selection of layers.

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