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Delamination Toughness of Stitched Laminated Composites – Testing and Numerical Results
Liyong TONG
School of Aerospace, Mechanical and Mechatronic Engineering, The University of Sydney, Australia
This presentation presents some recent testing and numerical results on the influence of transverse stitching on the mode I and mode II delamination toughness of laminated composites. In the testing, a tabbed DCB and ENF test is performed on stitched laminated composites with varying stitch distributions. The woven carbon fibre plies were laid-up in a symmetrical manner [0,±45,90]2, then stitched in a dry preform state followed by a resin film infusion stage. A testing machine was used to test the specimens at a crosshead speed of 0.5mm/min with crack lengths, crack opening displacements and peak load data being recorded after the crack front had propagated several millimetres. It is revealed that for stitched specimens with identical stitch densities but different stitch distributions, there exist significant variations in critical strain energy release rates, GIc, but negligible variation in mode II critical strain energy release rate. Both specimens were modelled using an in-house code and MSC/NASTRAN commercial software. The FEA results support the experimental findings identifying stitch distribution as a key parameter in determining the improvement that stitching provides in bridging mode I delaminations only.
Date: 2006-10-18 à 06:30
Endroit: Local 2510, pavillon Adrien-Pouliot,