Buckling of unidirectional boron/aluminum stiffeners, a caution to designers
Unidirectional boron/aluminum stiffeners were used to save weight in stiffened panels, where the cross sections were of such shapes as hats, i's, Z's, channels, etc. The buckling analysis of these structures is usually found to be unconservative when tests are performed. Even so, a weight saving of approximately 50 percent can be achieved in the stiffeners themselves by replacing their metal counterparts. A no-edge-free crippling test was performed on a unidirectional boron/aluminum laminated plate, where collapse occurred at a compressive load considerably below the theoretical bifurcation buckling point. This premature failure is explained by a numerical analysis of the test by the use of a nonlinear computer code, which revealed the presence of high transverse bending stresses beyond the capacity of the composite. (auth)
- Research Organization:
- General Dynamics Convair Div., San Diego, CA
- Sponsoring Organization:
- USDOE
- NSA Number:
- NSA-33-017886
- OSTI ID:
- 4111603
- Journal Information:
- J. Compos. Mater., v. 9, pp. 347-360, Other Information: Orig. Receipt Date: 30-JUN-76
- Country of Publication:
- United States
- Language:
- English
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