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An experimental investigation of the general instability of ring-stiffened, unpressurized, thin-walled cylinders under axial compression

Citation

McCoy, John C. (1958) An experimental investigation of the general instability of ring-stiffened, unpressurized, thin-walled cylinders under axial compression. Engineer's thesis, California Institute of Technology. http://resolver.caltech.edu/CaltechETD:etd-01102006-133017

Abstract

Eight different series of thin-walled Mylar cylinders were tested experimentally to investigate the general instability of ring-stiffened, unpressurized, thin-walled cylinders under axial compressive loading. The primary objectives for these tests were: to determine whether the bending or the torsional stiffness of the rings was the most effective stiffening parameter; to determine the relative effectiveness of ring-stiffeners around the inside and the outside of the cylinders; and to investigate the mechanism of buckling of unpressurized cylinders under axial compression.

It was found that the torsional stiffness of the ring-stiffeners was the most important parameter for stiffening the thin-walled Mylar cylinders under axial loading. Ring-stiffeners with a low torsional stiffness did not stiffen the cylinder effectively until the rings were closely spaced. Ring-stiffeners on the inside of the cylinders did not affect the maximum buckling load when they were not bonded to the cylinder walls. Ring-stiffeners on the outside of the cylinders provided effective stiffening whether they were bonded to the cylinder walls or not.

The experimental results of thin-walled cylinders under axial compression indicated that the cylinder walls expand laterally to some critical amount, at which time they become unstable and suddenly collapse into buckling. The ring-stiffeners increase the critical compressive load with their effective torsional stiffness by resisting the annular collapse of the cylinder walls into diamond shaped buckles. At an L/R ring spacing ratio of 1.0 or less, the walls tended to buckle across the ring-stiffeners.

Item Type:Thesis (Engineer's thesis)
Degree Grantor:California Institute of Technology
Division:Engineering and Applied Science
Major Option:Aeronautics
Thesis Availability:Public (worldwide access)
Research Advisor(s):
  • Sechler, Ernest Edwin
Thesis Committee:
  • Unknown, Unknown
Defense Date:1 January 1958
Record Number:CaltechETD:etd-01102006-133017
Persistent URL:http://resolver.caltech.edu/CaltechETD:etd-01102006-133017
Default Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:102
Collection:CaltechTHESIS
Deposited By: Imported from ETD-db
Deposited On:12 Jan 2006
Last Modified:26 Dec 2012 02:27

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