Abstract
Three-dimensional meso-mechanical analysis was conducted by the finite element method (FEM) in order to determine the elastic stress distribution around a crack tip in fiber-reinforced plastics (FRP). FRP plates were modeled as a typical 'one-fiber slice' model, represented by the fiber-resin model. The fibers were arranged in a square array with a fiber volume fraction of 0.60. Matrix crack plane parallel to the fiber direction was placed in the matrix and is subjected to mode I loading. The half-crack length normalized by fiber diameter was varied from a/d_f=0.2 to 200. For long crack, the matrix-stress distribution ahead of delamination front can be divided into three regions : Region I, II and III (IIIa, IIIb) in the order of increasing distance from crack tip. The matrix-stress in Region I had a singularity of 1/√<r>, but was smaller than that of homogeneous FRP. Region IIIa has a singularity, too. But stress intensity factor of Region III was not equal to that of Region I. Region II was transitional region from Region I to IIIa.
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