Science and Education Publishing American Journal of Mechanical Engineering 2328-4110 4 7 2016 12 17 Effective Material Moduli for Composites 289 292 EN Juraj Šarloši Department of Applied Mechanics and Mechanical Engineering, Technical University in Košice, Košice, Slovakia Jozef Bocko AJME20164711 10.12691/ajme-4-7-11 2016 9 12 2016 11 7 2016 12 15 In this article we deal with deriving the elastic modulus of composite materials. Modulus values in each direction are various, for example in parallel direction and the perpendicular direction. It depends on the material properties for fibers from material for matrix, density of fibers in the composite material, as well as on whether it is a single or multi-layer composite material and from the direction the filaments in the matrix.