Accession Number : ADA304543

Title :   Stress-Concentration Factors for Finite Orthotropic Laminates with a Circular Hole and Uniaxial Loading.

Descriptive Note : Technical paper,

Corporate Author : NATIONAL AERONAUTICS AND SPACE ADMINISTRATION HAMPTON VA LANGLEY RESEARCH CEN TER

Personal Author(s) : Hong, C. S. ; Crews, John H., Jr

PDF Url : ADA304543

Report Date : MAY 1979

Pagination or Media Count : 29

Abstract : Stresses were calculated for finite width orthotropic laminates with a circular hole and remote uniaxial loading using a two dimensional finite element analysis with both uniform stress and uniform displacement boundary conditions. Five different laminates were analyzed: quasi-isotropic 0/+/-45/9O deg), 0, 90, 0/90 DEGs, and +/-45 DEG5. Computed results are presented for selected combinations of hole diameter sheet width ratio d/w and length to width ratio L/w. For small L/w values, the stress concentration factors K(tn) were significantly different for the uniform stress and uniform displacement boundary conditions. Typically, for the uniform stress condition, the Ktn values were much larger than for the infinite strip reference condition; however, for the uniform displacement condition, they were only slightly smaller than for this reference. The results for long strips are also presented as width correction factors. For d/w < or = 0.33, these width correction factors are nearly equal for all five laminates.

Descriptors :   *LAMINATES, *STRESS CONCENTRATION, COMPOSITE MATERIALS, DISPLACEMENT, BOUNDARIES, HOLES(OPENINGS), AXES, CIRCULAR, CORRECTIONS.

Subject Categories : Laminates and Composite Materials
      Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE