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Mechanical Coupling due to Composite Structural Damage and Repair

Journal Article
ISSN: 1946-3979, e-ISSN: 1946-3987
Published December 02, 2008 by SAE International in United States
Mechanical Coupling due to Composite Structural Damage and Repair
Citation: Holloway, B. and Radford, D., "Mechanical Coupling due to Composite Structural Damage and Repair," SAE Int. J. Mater. Manf. 1(1):849-858, 2009,
Language: English


The research described examines the relationship between damage/repair scenarios and the resulting effect on the coupled response of the structure. The monocoque is simplified as a box beam and damage is simulated by introducing a hole in one side of the tube. Repair is simulated by adding plies to an undamaged area of the beam side. Composite beam samples were manufactured and tested using a 3-axis coordinate measurement machine (CMM), to experimentally verify the computer numerical predictions of the deformed shape. The beams were loaded with a combined torsion-bending load using an eccentric tip load and rigidly fixing the opposite end. Structural coupling was observed by computing the distortion center of the beam profile at cross-sections along its length and comparing the results to the undamaged/unrepaired beam. The experimental results correlate well with the finite element simulations and generally follow the predictions of the analytical model. It is found that both torsion-bending coupling and asymmetric torsional stiffness occur for both the damaged case and after structural repair.