Cord/rubber composites are often considered as homogeneous anisotropic media in macro-mechanical structural analysis. Challenges, however, are associated with significant non-linearity of their deformation and the visco-elastic nature of rubber matrix. These visco-elastic composites are often subjected to cyclic loading conditions (periodic excitations) and exhibit energy losses due to their hysteretic behavior. An approach is proposed to quantify these hysteretic energy losses under general case of two or three-dimensional cyclic loading. The approach provides a simple mathematical description of this non-linear visco-elastic phenomenon. Representative experimental data are considered to show the reliability of the approach. Uni-directionally reinforced single layer composites are considered under different off-axial cyclic loads to model 2-D stress/strain states. Possible methods are discussed to define composite properties using the proposed approach.

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