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RESEARCH PAPERS

External Pressure Loading of Spiral Paper Tubes: Theory and Experiment

[+] Author and Article Information
T. D. Gerhardt

Sonoco Products Company, 505D Science Dr., Madison, WI 53711

J. Eng. Mater. Technol 112(2), 144-150 (Apr 01, 1990) (7 pages) doi:10.1115/1.2903300 History: Revised May 09, 1989; Online April 29, 2008

Abstract

A closed-form elasticity solution is developed to predict stresses and strains in spiral paper tubes loaded axisymmetrically. No assumptions are made on stress distributions through the tube wall. Thus, the solution is valid for thick-walled tubes. The validity of this solution is established by comparison with experimental results. Measured strains in tubes subjected to external pressure showed remarkable agreement with the elasticity solution. After experimental verification, the elasticity solution is used to examine stress distributions in paper tubes loaded in external pressure. In both paper and isotropic tubes, the hoop stress dominates the other three stresses. However, the hoop stress distribution in paper tubes was radically different from the isotropic case. In paper tubes: (1) hoop stress was concentrated at the outer wall, especially for thicker tubes and (2) maximum hoop stress remained constant as tube thickness was increased. These differences can be attributed to the extremely small modulus in the radial direction of a paper tube. The hoop stress distributions indicate that isotropic, thick-walled cylinder theory is inapplicable for modeling paper tubes.

Copyright © 1990 by The American Society of Mechanical Engineers
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