Abstract
Cooling down a fiber composite from curing temperatures induces self-equilibrating stresses between the fibers and the matrix. Superimposed on the free edge condition, this leads to a three-dimensional problem which, on the assumption of a regular array of fibers, can be solved with the aid of the finite element method. Results obtained by this method, together with materials characteristics of carbon fiber/epoxy composites, show only small deviations from rotational symmetry. A ring of high axial stresses is observed within the fiber near the free edge. Interface shear stresses are built up rapidly and decrease slowly. Concentrations of radial and tangential stresses are found along the free edge interface line. The matrix is predominantly endangered by high tangential and axial stresses arising at a certain distance from the free edge.
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