SYMPOSIA PAPER Published: 01 January 1997

Residual Strength of Metal-Matrix Laminated Panels


The primary objective of this study was to investigate the residual strength of ARALL-3 and GLARE-2 center-notched panels without stiffeners. The R-curve approach in linear elastic fracture mechanics (LEFM) was used for the residual strength predictions.

The applicability of LEFM was verified through a series of tests of ARALL-3 and GLARE-2 center-notched panels with different layups. They demonstrated limited crack-tip plastic deformation. The R-curves calculated from the tests of different size panels with various initial crack extensions showed that they were independent of initial crack length and specimen width, which is true for the monolithic aluminum alloy. Polynomial curve fitting was used to obtain the R-curves for each laminate and laminate layup to be used for the R-curve residual strength predictions. The predictions were made by superimposing the crack driving force curves onto these R-curves to locate the tangent points. The results of prediction of unidirectional fiber/metal laminates proved that the R-curve approach was not only a suitable but simple method that has a great potential in the damage tolerance characterization of certain unstiffened and stiffened laminate materials.

Author Information

Wu, M
Failure Analysis Associates, Inc., Menlo Park, CA
Wilson, D
Tennessee Technological University, Cookeville, TN
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Developed by Committee: D30
Pages: 244–259
DOI: 10.1520/STP19931S
ISBN-EB: 978-0-8031-5353-0
ISBN-13: 978-0-8031-2411-0