Experimental observations of orthotropic elastic and viscoelastic characteristics of the elastomeric textile reinforced composites

Abstract

The paper deals with investigation elastic and viscoelastic properties of elastomeric composites by experimental tests. The composites has a textile unidirectional reinforcement. A displacement control load has been posed i.e. fixed values of strains has been set for specimen. Thus, an occurring effort has been measured. Quasi-static loading was applied to specimen. The results are automatically recorded, for each test in real time that gives a possibility to obtain detailed deformation curves of the material. Tests have been carried out in three principal directions: tensile test along reinforcement textile cord, tensile test across the reinforcement, and the test on compression of a plate in the direction perpendicular to the plane of the composite reinforcement.The experiments have been carried out under a cyclic loading with different amplitudes. The experiments have been conducted with strain sweep 2% and 5%. Engineering evaluation for the average initial modulus for this material has been also defined in each principal direction of the composite. The available experimental data allows to determine the area of the hysteresis loop by numerical integration for cycles. These results allows to estimate the viscous component of the deformation of rubber-cord composite. Appropriate experimental observations have been carried out with different amplitudes of loading in different directions. Thus, a loss modulus is evaluated depending on strain amplitude in different loading directions