STIFFNESS BASED FATIGUE DAMAGE CHARACTERISATION OF FIBROUS COMPOSITES
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The paper presents a simple procedure for measuring the changes in stiffness properties of a unidirectional fibrous composite caused by fatigue damage. Unlike previous attempts at stiffness based fatigue damage characterization, where one or two elastic constants have been investigated, changes in all four independent stiffness constants of an othotropic elastic lamina are considered. The results obtained for a unidirectional glass fiber reinforced polyester show that while small changes occur in the longitudinal elastic modulus and the Poisson's ratio of transverse to longitudinal strains, the shear modulus and the Poisson's ratio of longitudinal to transverse strains change significantly. The extension of this procedure to the fatiue damage characterization of laminates is discussed.
Economic Computation and Economic Cybernetics Studies and Research
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