SYMPOSIA PAPER Published: 01 January 1984
STP30203S

Criticality of Disbonds in Laminated Composites

Source

Usefulness of analytical methodologies and nondestructive tests for assessing criticality of disbonds in laminated composties is examined. Fracture mechanics approach and critical energy release rate concepts are employed for the prediction of catastrophic growth due to quasi-static transverse shear loading. Semi-empirical growth laws are considered for modeling slow growth under cyclic loading.

Brief descriptions of the analytical methods utilized for calculation of energy release rates are given. Sizes and locations of implanted disbonds in graphite/epoxy laminates are determined from ultrasonic C-scans. Analytical results and quasi-static destructive test data for beams subjected to three-point bending are correlated for determining the critical value of energy release rate. Effects of initial flaw size, location, sharpness of disbond tips, as well as mixed-mode (I and II) loading conditions are studied. Ultrasonic C-scans are also used for monitoring growth of disbonds in plate-type structures under cyclic transverse shear. Least square fits are attempted with the disbond growth rate data.

Author Information

Chatterjee, SN
Materials Sciences Corporation, Spring House, Pa.
Pipes, RB
Center for Composite Materials, University of Delaware, Newark, Del.
Blake, RA
Center for Composite Materials, University of Delaware, Newark, Del.
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: E08
Pages: 161–174
DOI: 10.1520/STP30203S
ISBN-EB: 978-0-8031-4902-1
ISBN-13: 978-0-8031-0218-7