Evidencing of the Damage Due to a Symmetrical, Alternate, Cyclical and Harmonic Stress, Measuring the Internal Damping in a Carbon Fiber Structure Made of Epoxy-Resin
Specimens consisting of thin tubes made of carbon-epoxy symmetrical laminate with various wiring orentations have been submitted to an harmonic torsional test for a wide range of stress level. As the shear stress τ exceeds a given threshold τmp, Δw/w. The so called damage depends on the maximum stress τmax experienced by the material (τ max> τmp).A decomposition in the laminate axes gives normal stresses σl(longitudinal), σt(transverse) and longitudinal shear σlt. The dependence of damage on σ l, σ t, σlt is discussed and seems to be a function of σt only, i.e: σt<(σ t)max
KeywordsCarbon Fiber Fiber Orientation Thin Tube Longitudinal Shear Matrix Modulus
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