Cylindrical Shells of Bimodulus Composite Materials

by Charles W. Bert, Benjamin H. Perkinson Prof. of Engrg.; Univ. of Oklahoma, Norman, Okla.,
V. Sudharkar Reddy, Grad. Research Asst.; Mech. Engrg., Univ. of Oklahoma, Norman, Okla.,


Serial Information: Journal of the Engineering Mechanics Division, 1982, Vol. 108, Issue 5, Pg. 675-688


Document Type: Journal Paper

Discussion: Rao K. P. (See full record)
Closure: (See full record)

Abstract: Certain fiber-reinforced materials, especially those with slightly curved fibers in very soft matrices, exhibit considerably smaller stiffnesses when loaded in compression than when loaded in tension. Examples are tire cord-rubber, wire-reinforced solid propellants, and certain soft biological tissues. For purposes of analysis and design, such materials can be modeled as a bimodulus material, i.e., one having one set of stiffnesses when the fiber direction strain is tensile and another set when this strain is compressive. Using the fiber-governed bimodulus-material model introduced several years ago and verified for cord-rubber composites, the previous work is extended on the deflection of single-layer and cross-ply laminated rectangular plates to circular cylindrical shells of the same construction. A closed-form solution is presented for the case of a simply supported cylindrical panel under sinusoidally distributed loading. Numerical results are presented to show the effect of shell curvature on the neutral-surface position and deflection.

Subject Headings: Fiber reinforced composites | Ultimate strength | Load factors | Curvature | Fibers | Stiffening | Compression | Strain

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