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Acoustic emission on failure analysis of rubber-modified epoxy resin

Acoustic emission on failure analysis of rubber-modified epoxy resin Rubber-modified epoxy resins have been employed as adhesive and matrix materials for glass and corbon-fiber composites. The behavior of fracture around a crack tip for rubber-modified epoxy resin is investigated through the acoustic emission (AE) analysis of compact tension specimens. Damage zone and rubber particles distributed around a crack tip were observed by a polarized optical microscope and an atomic force microscope (AFM). The damage zone in front of pre-crack tip in rubber-modified specimen (15 wt% rubber) began to form at about 13 % level of the fracture load and grew in size until 57 % load level. After that, the crack propagated in a stick-slip manner. Based on time-frequency analysis of AE signals and microscopic observation of damage zone, it was thought that AE signals with frequency bands of 0.15–0.20 MHz and 0.20–0.30 MHz were generated from cavitation in the damage zone and crack propagation, respectively. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Fibers and Polymers Springer Journals

Acoustic emission on failure analysis of rubber-modified epoxy resin

Lee, Deok-Bo
Fibers and Polymers , Volume 5 (4): 5 – Dec 1, 2004
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References (17)

Publisher
Springer Journals
Copyright
Copyright © The Korean Fiber Society 2004
ISSN
1229-9197
eISSN
1875-0052
DOI
10.1007/bf02875522
Publisher site
See Article on Publisher Site

Abstract

Rubber-modified epoxy resins have been employed as adhesive and matrix materials for glass and corbon-fiber composites. The behavior of fracture around a crack tip for rubber-modified epoxy resin is investigated through the acoustic emission (AE) analysis of compact tension specimens. Damage zone and rubber particles distributed around a crack tip were observed by a polarized optical microscope and an atomic force microscope (AFM). The damage zone in front of pre-crack tip in rubber-modified specimen (15 wt% rubber) began to form at about 13 % level of the fracture load and grew in size until 57 % load level. After that, the crack propagated in a stick-slip manner. Based on time-frequency analysis of AE signals and microscopic observation of damage zone, it was thought that AE signals with frequency bands of 0.15–0.20 MHz and 0.20–0.30 MHz were generated from cavitation in the damage zone and crack propagation, respectively.

Journal

Fibers and Polymers – Springer Journals

Published: Dec 1, 2004

Keywords: Acoustic emission; Time-frequecy analysis; Fracture energy; Damage zone; Rubber-Modified Epoxy Resin; Fracture Toughness; Toughening mechanism; Rubber Particle

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