EXPERIMENTAL AND THEORETICAL STUDIES ON MECHANICAL CHARACTERISTICS OF AN IMPORTANT COMPOSITE MATERIAL Polymeric composites are widely used materials in very complex parts, because of their special characteristics. There are theoretical relationships which can be used in predicting a composite material characteristic values (stress, elasticity modulus, elongation etc) but, reality proved that these relations are not so accurate. So, determining real values of polymeric composite material important mechanical characteristics is essential for parts exploitation resistance and reliability calculi. This paper presents experimental and theoretical studies for determining a random reinforced glass fiber polymeric composite material mechanical characteristics, pointing out the importance of knowing real values of these characteristics in parts designing. The obtained results are, also, confirmed by statistical data processing while, importance of the involved studies is evidenced by a case study finite element ANSYS simulation.