Stress Analysis of B-52 Pylon Hooks for Carrying the X-38 Drop Test Vehicle
Ko, William L. (1997) Stress Analysis of B-52 Pylon Hooks for Carrying the X-38 Drop Test Vehicle. Technical Report NASA/TM-97-206218, Research Engineering, NASA Dryden Flight Research Center.
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Abstract
The finite-element structural analysis method was used in a two-dimensional stress concentration analysis of a new pylon hook for carrying the X-38 lifting body atmospheric drop test vehicle on the B-52 carrier aircraft. The stress distributions in the hook were obtained, and the critical stress points were identified. The functional relationships between the applied hook load and the induced maximum tangential and shear stresses were established for setting the limit hook load for test flights. By properly representing the X-38 hook with an equivalent curved beam, the conventional curved beam theory predicted the values of the maximum tangential and shear stresses quite close to those calculated from the finite-element analysis. The equivalent curved beam method may be of practical value during the initial stage of the hook design in estimating the critical stresses and failure loads with reasonable accuracy.
| EPrint Type: | NASA Technical Memorandum |
|---|---|
| Keywords: | Equivalent curved beam theory, Finite element stress analysis, Stress concentrations, X-38 hooks |
| Subjects: | Aircraft/Project: B-52 (31 - 39) Engineering: (39) Structural Mechanics Aircraft/Project: X-38 |
| ID Code: | 149 |
| Deposited On: | 08 June 2004 |
| Additional Information: | 34 pages. |
