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Recent Data on the Collapse of Spherical Caps under External Pressure

Published online by Cambridge University Press:  04 July 2016

Bertram Klein
Bertram Klein*
Affiliation:
Douglas Aircraft Co., Missile and Space Systems Division, California
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Extract

Recently additional tests have been performed to measure the external pressure necessary to collapse spherical caps. Bellinfante used plastic domes that were machined readily and accurately to final size. The Douglas test data shown in Fig. 1 are considered to be excellent. (2b is the base of the dome).

Thurston used aluminium caps that were chemically etched to final size. However, he intentionally put small dents at the apex. These initial distortions cause wide scatter in the test data as shown in Figs. 2(a) and 2(b). Examination of the recorded waviness reported -by Thurston indicates that the more perfect shells reached higher loads than the others. Note, for example, specimens 1, 6, 11, 16, 28, and 38. Also, usually the more wavy specimens exhibited the lower buckling loads. See specimens 4, 7, 9, 12, 17, 22, 27. Since Thurston's specimens were chemically etched to very thin gauges, the thickness variation could be significant. He does not report actual thickness variation in the shell, but states it could be about 15 per cent at worst.

Type
Technical Notes
Information
The Aeronautical Journal , Volume 70 , Issue 662 , February 1966 , pp. 366 - 367
Copyright
Copyright © Royal Aeronautical Society 1966

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