DYNAMIC INSTABILITY ANALYSIS OF THIN SHELL STRUCTURES SUBJECTED TO FOLLOWER FORCES (6TH REPORT); DYNAMIC THRESHOLD CHARACTERISTICS OF POST- CRITICAL STABILITY
The general governing equations of equilibrium and dynamic stability for thin shells subjected to follower loads and undergoing large deformations have already been detailed in the previous reports for the general shell defined in a monoclinically convected coordinate system. This paper expands this approach for a wide curvature range from shallow to deep shells and the characteristic curves of dynamic stability threshold for partial cylindrical shells and partial shperical shells are obtained. It is found that while the spherical shells generally fail dynamically before the static critical limit, cylindrical shells retain their dynamically stable behaviour a little longer. The backgrounds of geometrical and strength aspects during the deformation process are also analyzed. The existence of a post- critical stability phase for shallow shells, which had been hypothesized in a previous report is investigated and conclusive numerical evidence to this effect is obtained. The practical aspects of a shell design for the elastically feasible range of ultra-large deformations can be visualized, for which there may be a need arising in the futuristic constructions in the sea with dynamically deflecting outer shells that may be allowed to flex safely like a tarpaulin tent in wind.
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Supplemental Notes:
- J Soc Naval Arch Japan, v 176, Dec 1994, p 319 [12 p, 6 ref, 13 fig]
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Authors:
- George, T
- Fukuchi, N
- Publication Date: 1994
Language
- English
Subject/Index Terms
- TRT Terms: Numerical analysis; Shells (Structural forms); Stability (Mechanics)
- Uncontrolled Terms: Thin shells
- Subject Areas: Bridges and other structures; Marine Transportation;
Filing Info
- Accession Number: 00710732
- Record Type: Publication
- Source Agency: British Maritime Technology
- Files: TRIS
- Created Date: Aug 14 1995 12:00AM