SYMPOSIA PAPER Published: 01 January 1987
STP24380S

The Characterization of Edge Delamination Growth in Laminates Under Fatigue Loading

Source

It is generally accepted that the onset and stable growth of edge delaminations under quasi-static loading can be characterized using the strain energy release rate G and delamination resistance curves (R curves). This study addresses the problem of edge delamination growth under fatigue loading. To characterize the fatigue growth successfully, it is shown that it is not sufficient to consider only the maximum energy (Gmax) released as the delamination grows. Instead, the energy released must be compared to the increasing resistance to further growth. This increasing resistance to delamination grwoth GR can be explained best in terms of the associated matrix cracking, which is observed under both static and fatigue loading. Using results from a [±30/±30/90/9¯0]s T300-5208 and a [45/0/−45/90]s XAS-914 graphite-epoxy laminate, separate power law correlations between the edge delamination fatigue growth rates and the term (Gmax/GR) are obtained. The measured exponents are in the range 4.1 to 6.

Author Information

Poursartip, A
The University of British Columbia, Vancouver, B.C., Canada
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Details
Developed by Committee: D30
Pages: 222–241
DOI: 10.1520/STP24380S
ISBN-EB: 978-0-8031-5002-7
ISBN-13: 978-0-8031-0934-6