The Influence Of Restraint Systems On Panel Behavior
When a panel is tested in uniaxial compression in a test machine, the boundary conditions are not quite the same as they would be if it were part of a complete structure. A restraint system may be used to simulate conditions found in a complete vehicle. Quantifying the quality of the restraint with only point-measurement devices can leave an inadequate characterization of the out-of-plane behavior. However, today’s full-field displacement monitoring techniques allow for much more accurate views of the global panel deformation and strain, and therefore allow for a better understanding of panel behavior. In the current study, the behavior of a hat-stiffened and two rod-stiffened carbon-epoxy panels is considered. Panels were approximately 2 meters tall and 0.76 to 1.06 m wide. Unloaded edges were supported by knife edges and stiffeners were attached to a support structure at selected locations to restrain out-of-plane motion. A comparison is made between test results based on full-field measurements and analyses based on assumptions of boundary conditions of a completely rigid edge restraint and the absence of any edge restraint. Results indicate that motion at the restrained edges must be considered to obtain accurate test-analysis correlation.
KeywordsGraphite Foam Epoxy Flange
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- 1.Velicki, Alex, “Damage Arresting Composites for Shaped Vehicles, Phase I Final Report, NASA CR-2009-215932, September 2009.Google Scholar
- 2.McGowan, David M., Ambur, Damodar R., and McNeil, Stephen R. 2003. “Full-field Structural Response of Composite Structures: Analysis and Experiment,” presented at the 44th AIAA/ASME/ASCE/AHS Structures, Dynamics and Materials Conference, AIAA 2003–1623, Norfolk, VA, April 2003.Google Scholar
- 3.Rankin, C. C., Brogan, F. A, Loden, W. A., and Cabiness, H. D. 2001. "STAGS User Manual, Version 4.0." Lockheed Martin Missiles and Space Company, Incorporated.Google Scholar