SYMPOSIA PAPER Published: 01 January 1985
STP36301S

Energy Release Rate During Delamination Crack Growth in Notched Composite Laminates

Source

The elastoplastic nature of delamination crack growth in composite laminates is discussed. A simple estimation of the local elastic strain energy release rate in the presence of plasticity (IL) is made, and used as a criterion for stable delamination crack growth in notched composite laminates. A three-dimensional elastoplastic, generally orthotropic finite-element method is used for the analysis. The finite-element techniques developed for estimating IL (in Mode I, Mode II, Mode III, and mixed-mode fracture) and for crack growth simulation are described. The analysis has been used to predict the initiation and growth of delamination near through-the-thickness cracks in central and single-edge notched [±45/0]s graphite/epoxy laminates subjected to static in-plane tensile stresses normal to the notches. Delamination between +45/−45 and −45/0 interfaces and material yielding at different stages of loading are presented. Numerical results demonstrate that the proposed elastoplastic fracture criterion is very effective in predicting stable delamination crack growth in composite laminates having nonlinear matrix-dominated properties.

Author Information

Mahishi, JM
Concept Analysis Corporation, Plymouth, MI
Adams, DF
Concept Analysis Corporation, Plymouth, MI
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Details
Developed by Committee: E08
Pages: 95–111
DOI: 10.1520/STP36301S
ISBN-EB: 978-0-8031-4941-0
ISBN-13: 978-0-8031-0414-3