REFINEMENTS IN THE APPROXIMATE ANALYSIS OF WEB-STIFFENED SANDWICH STRUCTURES
The first reported exploration of possible use of rib-cored sandwich structures in marine applications was carried out at the Naval Ship Research and Development Center. Measurements from the NSRDCs experiments indicate that web-stiffened sandwich structures in the form of cylindrical shells ( and, by implication, flat plates and beams ) are among the most efficient ones tested, possessing high stiffness-to-weight ratios. Presented in this work is a method of construction of approximate functions in connection with the energy formulation of certain eigenvalue problems of web-stiffened sandwich structures. The construction is based upon the method of Young togeth with a group of fundamental functions deduced from Timoshenkos flexural equations for elastic beams. The analysis is exemplified and numerically tested by the eigenvalue problems of free vibrations and of one-dimensional sandwich structures. Results indicate that the present method possesses marked advantages over similar constructions oriented from the classical flexural normal modes of Bernoulli-Euler.
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Corporate Authors:
Polytechnic Institute of Brooklyn
333 Jay Street
Brooklyn, NY United States 11201Office of Naval Research
Department of the Navy, 800 North Quincy Street
Arlington, VA United States 22217 -
Authors:
- Chenn, Youl-Nan
- Cicero, Frank
- Kempner, Joseph
- Publication Date: 1970-11
Media Info
- Features: Appendices; Figures; References; Tables;
- Pagination: 61 p.
Subject/Index Terms
- TRT Terms: Buckling; Cylinders (Geometry); Flexural strength; Sandwich construction; Shells (Structural forms); Stiffness; Vibration; Web stiffened structures
- Uncontrolled Terms: Cylindrical shells; Flexural stiffness
- Subject Areas: Marine Transportation; Materials;
Filing Info
- Accession Number: 00010202
- Record Type: Publication
- Report/Paper Numbers: PIBAL Rpt No 70-45 R&D Rpt
- Contract Numbers: N00014-67A-0438-0007
- Files: TRIS
- Created Date: Feb 25 1971 12:00AM