Download or read book Three-dimensional Analysis of Stress Concentrations Near Holes in Laminated Composites written by Richard M. Barker and published by . This book was released on 1972 with total page 25 pages. Available in PDF, EPUB and Kindle. Book excerpt: Stress concentration factors are determined using a three-dimensional finite-element analysis for laminated composites pierced by circular, square and diamond-shaped holes. Both angel-ply and bidirectional laminates are investigated for hole size to width-of- strip ratios from 0.125 to 0.41. 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 (+ or -45) LAMINATES ARE RECOMMENDED. When large holes are present, bidirectional (90/0) laminates are shown to be more efficient. (Author-PL).