NUMERICAL ANALYSIS OF COMPOSITE PLATES REINFORCED GLASS AND CARBON FIBERS IN COMPLEX LOAD CONDITIONS

Numerical analysis was a purpose of researches on a composite structure in terms of two aspects. The first was to choose optimum configuration of a layer laminate and the second was to obtain the best parameters of strength structure, which was subjected to analysis in complex load (tension and shearing loads). A subject of researches was made by composite materials by a matrix epoxy reinforcement glass and carbon fibers (unidirectional tape of pre-pregs, system HexPly M12 Excel) which was created by an autoclave technology. These two composite systems are used to build helicopter blade. They are characterised a very high stability on fatigue and good exploitation properties. The build of numerical model in composite shield was founded on a technique Layup-Ply, which was one of the basic way for modelling composite materials in a program Abaqus. Grounds for estimate to strength researches structures were criterions: Maximum Stress Criterion, Tsai-Hill's criterion, tensor criterion of Tsai-Wu's and Azzi-Tsai-Hill's criterion. Numerical calculations were an introductory analysis of failure composite materials. It was depend on judge numerical model in terms of appearance areas, in which a risk of damage laminate was existed by an effect of external loads. Numerical analysis in plates composites was carried out, where the plates were under complex loads (technical tension and shear). It was shown a dominant strength of researching construction for transfer a tension load. On the basis of receiving solutions was found a higher strength of composite which was created from carbon fibres in compare with glass fibres. The shield was nearly twice thinner. In this range using FEM is very useful and makes possible to optimality composite structure. It is easier to choose the best parameters of a material on the first step of projecting the construction.