Abstract
The previous experimental studies have demonstrated that fiber-reinforced laminated composites exhibit lower interlaminar fracture resistance at high loading rates. This global behavior has been physically attributed to the rate dependency of the fiber bridging extent. The first aim of the present paper is to assess the influence of the local separation rate on the stress distribution within the fracture process zone near the crack tip. The practical traction-separation laws for the double-cantilever beam specimens under various imposed loading rates are characterized by using the J-integral approach. The derived bridging laws show that the maximum bridging traction decreases by increasing the separation rate. Subsequently, the tetralinear cohesive zone model is modified to include the rate dependency of the bridging energy and the bridging traction in the numerical simulation of mode I dynamic delamination. The proposed model has been implemented in the commercial finite element ABAQUS software via a user-defined subroutine. Good agreement between the finite element and experimental results verifies the reliability and accuracy of the model to account for the rate effects in presence of the large-scale fiber bridging.
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