Characterization of Delamination Onset and Growth in a Composite Laminate
- 1 January 1982
- book chapter
- Published by ASTM International
- p. 140-167
- https://doi.org/10.1520/stp34325s
Abstract
The onset and growth of delaminations in unnotched [±30∕±30∕90∕90¯]s graphite-epoxy laminates is described quantitatively. These laminates, designed to delaminate at the edges under tensile loads, were tested and analyzed. Delamination growth and stiffness loss were monitored nondestructively. Laminate stiffness decreased linearly with delamination size. The strain energy release rate, G, associated with delamination growth, was calculated from two analyses. A critical G for delamination onset was determined, and then was used to predict the onset of delaminations in [+45n/−45n/0n/90n]s (n = 1,2,3) laminates. A delamination resistance curve (R-curve) was developed to characterize the observed stable delamination growth under quasi-static loading. A power law correlation between G and delamination growth rates in fatigue was established.Keywords
This publication has 10 references indexed in Scilit:
- Interlaminar stress singularities at a straight free edge in composite laminatesComputers & Structures, 1981
- Initiation and Growth of Transverse Cracks and Edge Delamination in Composite Laminates Part 1. An Energy MethodJournal of Composite Materials, 1980
- An Energy Release Rate Approach For Stable Crack Growth in the Free-Edge Delamination ProblemJournal of Composite Materials, 1977
- Fatigue Damage: Stiffness/Strength Comparisons for Composite MaterialsJournal of Testing and Evaluation, 1977
- Some New Results on Edge Effect in Symmetric Composite LaminatesJournal of Composite Materials, 1977
- Delamination in Quasi-Isotropic Graphite-Epoxy LaminatesPublished by ASTM International ,1977
- Debond Propagation in Composite-Reinforced MetalsPublished by ASTM International ,1975
- On the prevention of delamination of composite laminatesPublished by American Institute of Aeronautics and Astronautics (AIAA) ,1974
- Some observations on the interlaminar strength of composite laminatesInternational Journal of Mechanical Sciences, 1973
- FracturePublished by Springer Nature ,1958