Stress-Concentration Factors for Finite Orthotropic Laminates with a Circular Hole and Uniaxial Loading.
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.
Document Details
- Document Type
- Technical Report
- Publication Date
- May 01, 1979
- Accession Number
- ADA304543
Entities
People
- C. S. Hong
- John H. Crews Jr.
Organizations
- Langley Research Center