The finite element method is used to investigate the load-carrying characteristics and the stress profiles in unidirectional short fiber polymeric composites. The micromechanics composite model incorporates a hybrid interphase region surrounding the fiber. The new interphase concept involves different domains of interaction between different material properties depending on the corresponding properties of primary constituents, volumetric composition and macroscopic characterization of the composite. Thus, the hybrid interphase is not defined within a unique thickness, its outer radius being a function of the material property under consideration. The model describes also imperfect adhesion conditions by immediate softening of material properties. Numerical results are illustrated and discussed for a variety of the involved parameters. These results referring mainly to hoop and radial stresses along the fiber length confirm the intense variation of stress in this area. Parametric studies have been conducted accounting for different degrees of adhesion and shapes of the fiber tip and where it is possible comparisons with existing theories and experimental results taken from literature are illustrated.