Post-Buckling Behavior under Mode Interaction

by Antonio J. Reis, Asst. Prof. of Civ. Engrg.; Instituto Superior Technico, Technical Univ. of Lisbon, Lisbon, Portugal,
John Roorda, Prof. of Civ. Engrg.; Univ. of Waterloo, Warterloo, Ontario, Canada,

Serial Information: Journal of the Engineering Mechanics Division, 1979, Vol. 105, Issue 4, Pg. 609-621

Document Type: Journal Paper


The post-buckling behavior of continuous elastic systems under interaction of two symmetric stable or unstable modes, is considered. For the cases of two stable (unstable) modes with a negative (positive) interaction coefficient, it is shown that mode interaction increases imperfection sensitivity whenever a 2 times 2 energy matrix of the perfect system is indefinite (negative definite). Cases where the simultaneous mode design criterion does not lead to an increased imperfection sensitivity are considered. An example of this situation is supported by experimental results.

Subject Headings: Post buckling | Elastic analysis | Symmetry | Case studies | Matrix (mathematics)

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