STRESS CONCENTRATIONS NEAR HOLES IN LAMINATES

Stress concentration factors are determined using a three-dimensional finite-element analysis for laminated composites pierced by circular, square, and diamond-shaped holes. Both angle-ply and bidirectional laminates are investigated for hole size to width-of-strip ratios from 0.125 to 0.417. Normal stress concentrations are found to be the least for square holes and greatest for diamond-shaped holes. Interlaminar shear concentrations, which cannot be determined by a two-dimensional analysis, are as large at the hole surface as those at the free edge when angle-ply laminates are utilized and the holes are large. For small circular holes, angle-ply laminates are recommended. When large holes are present, bidirectional laminates are shown to be more efficient.

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  • Supplemental Notes:
    • Presented at the November 13-14, 1972, ASCE Engineering Mechanics Division Speciality Conference, held at Pittsburgh, Pa.
  • Corporate Authors:

    American Society of Civil Engineers

    345 East 47th Street
    New York, NY  United States  10017-2398
  • Authors:
    • Barker, R M
    • Dana, J R
    • Pryor Jr, C W
  • Publication Date: 1974-6

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Subject/Index Terms

Filing Info

  • Accession Number: 00260566
  • Record Type: Publication
  • Report/Paper Numbers: Proc. Paper 10590
  • Files: TRIS
  • Created Date: Oct 11 1974 12:00AM