Stress Concentrations Near Holes in Laminates

by Richard M. Barker, (M.ASCE), Prof. of Civ. Engrg.; Virginia Polytechnic Inst. and State Univ., Blacksburg, VA,
Jon R. Dana, Grad. Student; Engrg. Sci. and Mech. Dept., Virginia Polytechnic Inst. and State Univ., Blacksburg, VA,
Charles W. Pryor, Jr., (A.M.ASCE), Sr. Engr.; Babcock and Wilcox, Power Generating Div., Lynchburg, VA,

Serial Information: Journal of the Engineering Mechanics Division, 1974, Vol. 100, Issue 3, Pg. 477-488

Document Type: Journal Paper


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 stress 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 (±45) laminates are recommended. When large holes are present, bidirectional (90/0) laminates are shown to be more efficient.

Subject Headings: Stress analysis | Shear stress | Laminated materials | Three-dimensional analysis | Finite element method | Two-dimensional analysis | Free surfaces

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