A Comparison of Experimental and Calculated Thin-Shell Leading-Edge Buckling Due to Thermal Stress
Jenkins, Jerald M. (1988) A Comparison of Experimental and Calculated Thin-Shell Leading-Edge Buckling Due to Thermal Stress. Technical Report NASA TM-100416, Research Engineering, NASA Dryden Flight Research Center.
Full text available as: |
Abstract
High-temperature thin-shell leading-edge buckling test data are analyzed using NASA structural analysis (NASTRAN) as a finite element tool for predicting thermal buckling characteristics. Buckling points are predicted for several combinations of edge boundary conditions. The problem of relating the appropriate plate area to the edge stress distribution and the stress gradient is addressed in terms of analysis assumptions. Local plasticity was found to occur on the specimen analyzed, and this tended to simplify the basic problem since it effectively equalized the stress gradient from loaded edge to loaded edge. The initial loading was found to be difficult to select for the buckling analysis because of the transient nature of thermal stress. Multiple initial model loadings are likely required for complicated thermal stress time histories before a pertinent finite element buckling analysis can be achieved. The basic mode shapes determined from experimentation were correctly identified from computations.
| EPrint Type: | NASA Technical Memorandum |
|---|---|
| Keywords: | Buckling, Thermal buckling, Thermal stress |
| Subjects: | (31 - 39) Engineering: (39) Structural Mechanics |
| ID Code: | 429 |
| Deposited On: | 07 April 2005 |
| Additional Information: | 17 pages. |
