SYMPOSIA PAPER Published: 01 January 1988
STP26133S

Instability-Related Delamination Growth in Thermoset and Thermoplastic Composites

Source

Mixed-mode crack propagation in compressively loaded thermoset and thermoplastic composite columns with an imbedded through-width delamination (ITWD) is investigated. Beam theory is used to analyze the geometrically nonlinear load-deformation relationship of the delaminated subregion. The beam-theory model incorporated the effects of elastic restraint at the ends of the delaminated subregion. The elastic restraint model (ERM), combined with existing finite-element modeling of the crack-tip region yields expressions for the Mode I and Mode II components of the strain energy release rate GI and GII to predict the critical load at the onset of delamination growth. Experimental data were generated for geometries yielding a wide range of GI/GII ratios at the onset of crack growth. A linear mixed-mode crack growth criterion (GI/GIc + GII/GIIc = 1) in conjunction with the ERM provides good agreement between predicted and measured critical loads for both materials studied.

Author Information

Rothschilds, RJ
Center for Composite Materials, University of Delaware, Newark, DE
Gillespie, JW
Center for Composite Materials, University of Delaware, Newark, DE
Carlsson, LA
Center for Composite Materials, University of Delaware, Newark, DE Florida Atlantic University, Boca Raton, FL
Price: $25.00
Contact Sales
Related
Reprints and Permissions
Reprints and copyright permissions can be requested through the
Copyright Clearance Center
Details
Developed by Committee: D30
Pages: 161–179
DOI: 10.1520/STP26133S
ISBN-EB: 978-0-8031-5044-7
ISBN-13: 978-0-8031-0980-3