Three-dimensional effects of crack closure in laminated composite plates subjected to bending loads
Kwon, Young W.
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Fracture is one of the dominant failure modes in structures subjected to external loads. Stress and deformation fields around the crack tip are important to understand the crack propagation and arrest. For a plate with a through-the-thickness crack and subjected to a bending load, there is crack closure on the compression side of the crack face. The present study investigates effects of crack closure on the stress and deformation fields on the tension side of the crack face. A three-dimensional finite element analysis is performed for laminated composite plates using both the line and surface crack closure models. For a composite whose longitudinal elastic modulus is much greater than the transverse modulus, line and surface closure models result in higher stresses near the crack tip in comparison to the no-closure solution. Hence, no-closure solutions are nonconservative for the composite. Transverse shear is the major cause for the nonconservative solution
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