SYMPOSIA PAPER
Published:
01 January 1985
STP36310S
Analysis of Local Delaminations and Their Influence on Composite Laminate Behavior
SourceAn equation was derived for the strain-energy release rate, G, associated with local delamination growth from a matrix ply crack. The critical Gc for edge delamination onset in [±25/902]s graphite/epoxy laminates was measured and used in this equation to predict local delamination onset strains in [±25/90n]s, where n = 4, 6, 8 laminates. A simple technique for predicting strain concentrations in the primary load bearing plies near local delaminations was developed. These strain concentrations were responsible for reduced laminate nominal failure strains in laminates containing local delaminations. The influences of edge delamination and matrix crack tip delamination on laminate stiffness and strength were compared.
Author Information
O'Brien, TK
U.S. Army Research and Technology Laboratories (AVSCOM), NASA Langley Research Center, Hampton, VA
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Details
Developed by Committee: D30
Pages: 282–297
DOI: 10.1520/STP36310S
ISBN-EB: 978-0-8031-4941-0
ISBN-13: 978-0-8031-0414-3