Accession Number : AD0743951

Title :   Material Nonlinearity Effects in Optimization Considerations of Stiffened Cylinders and Interpretation of Test Data Scatter for Compressive Buckling

Descriptive Note : Final technical rept.

Corporate Author : STANFORD UNIV CA DEPT OF AERONAUTICS AND ASTRONAUTICS

Personal Author(s) : Mayers, J ; Meller, E

PDF Url : AD0743951

Report Date : Mar 1972

Pagination or Media Count : 62

Abstract : A limited optimization study is undertaken of imperfect, eccentrically stiffened 2024-T3 aluminum alloy cylinders under axial compression based on (1) a linear theory with applied buckling load reduction factors to account for initial imperfections and inelasticity and (2) a kinematically and constitutively nonlinear maximum strength analysis. The latter is shown to be less conservative for the most efficient design: combined stringer- and ring- stiffening. Credibility of the maximum strength approach is domonstrated through its use in correlating experimental results obtained for 10- and 14-in. diameter steel cylinders having different proportional-limit stresses, respectively. Finally, material nonlinearity is shown to offer a plausible qualitative explanation for a significant amount of the scatter in axial compression tests for cylinders with radius-to-thickness ratios of practical interest.

Descriptors :   *AIRFRAMES, *STIFFENED CYLINDERS, ALUMINUM ALLOYS, BUCKLING, COMPRESSIVE PROPERTIES, FAILURE(MECHANICS), LOADS(FORCES), OPTIMIZATION, PLASTIC PROPERTIES

Subject Categories : Aircraft
      Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE