Accession Number : AD0872158

Title :   An Equation for Predicting the Residual Static Strength of Stiffened Panels.

Descriptive Note : Technical rept.,

Corporate Author : ARMY AVIATION MATERIEL LABS FORT EUSTIS VA

Personal Author(s) : Figge, I. E., Sr

Report Date : APR 1970

Pagination or Media Count : 43

Abstract : An equation has been developed to predict the residual static strength of stiffened panels. All parameters in the equation can be evaluated from tests on simple unstiffened specimens. The stiffened panel is treated as a composite material, with the sheet material representing the matrix and the stiffeners representing the fibers. The residual static strength of the cracked sheet, calculated using notch strength analysis, and the proportional limit of the stiffeners are used in the law-of-mixtures equation to calculate the residual static strength of the stiffened panels. Excellent predictions of the residual static strength of stiffened panels have been obtained and are presented for a wide variety of panel configurations, type fasteners, and crack geometry. (Author)

Descriptors :   *COMPOSITE MATERIALS, *AIRCRAFT PANELS, STRUCTURAL PROPERTIES, FRACTURE(MECHANICS), CRACKS, TOUGHNESS, PREDICTIONS, EXPERIMENTAL DATA, FAILURE(MECHANICS), RIVETS, NOTCH TOUGHNESS.

Subject Categories : Aircraft
      Laminates and Composite Materials
      Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE