Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
818735 | Composites Part B: Engineering | 2011 | 7 Pages |
Abstract
Dynamic strain signals from embedded fiber Bragg grating sensors are used for experimental modal analysis in carbon fiber reinforced polymer plates. Throughout a series of impact tests, the change of eigenfrequencies due to damage is evaluated for different impact energies. A detailed numerical model including the damage pattern obtained from X-ray computed tomography images demonstrates that most of the frequency changes can be explained by a delamination type of damage, whereas the total delamination surface has an affine relation to the absorbed impact energy. A homogenized damage model, including two damage factors, allows to predict the change of natural frequencies for a known damage size.
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Physical Sciences and Engineering
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Authors
Jeannot Frieden, Joël Cugnoni, John Botsis, Thomas Gmür,