Characterization of Epoxy Resin Including Strain Rate Effects Using Digital Image Correlation System
Publication: Journal of Aerospace Engineering
Volume 25, Issue 2
Abstract
The mechanical response of epoxy resin Epon E 863 has been studied in tension, compression, and flexure. The epoxy resins have been tested at different strain rates ranging from to . Two types of dog-bone geometries have been used in the tension tests. Small sized cubic, prismatic, and cylindrical samples were used in compression tests. Beams with quarter deep notches or grooves were tested at their midpoints in flexural tests. Strains were measured by using a digital image correlation technique, extensometer, strain gages, and actuator. Observation of sample geometry during tension tests at constant elongation rate shows necking and crazing in Epon E 863. Cubic, prismatic, and cylindrical compression samples undergo a stress drop at yield, but only cubic samples experience strain hardening before failure. Characteristic points of tensile and compressive stress strain relation and load deflection curve in flexure, such as proportional elastic limit stress (PEL), ultimate tensile strength (UTS), compressive yield strength (CYS), and failure strain were measured and their variations with strain rate studied.
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Acknowledgments
The authors gratefully acknowledge the support of this research by the Army Research Office, AMSRD-ARL-RO-SI Proposal Number 49008-EG, Agreement Number W911NF-07-1-0132, Program Manager: COL. Reed F. Young. We also thank Dr. Dallas Kingsbury from Arizona State Univ. for assistance in conducting the tests.
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Information & Authors
Information
Published In
Journal of Aerospace Engineering
Volume 25 • Issue 2 • April 2012
Pages: 308 - 319
Copyright
© 2012. American Society of Civil Engineers.
History
Received: Nov 29, 2010
Accepted: May 10, 2011
Published online: May 12, 2011
Published in print: Apr 1, 2012
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