Journal
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
Volume 37, Issue 4, Pages 585-591Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.compositesa.2005.05.013
Keywords
thermosetting resins; residual/internal stress; mechanical testing; thermal pressure coefficient
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We report results from a study of isotropic residual stress development for thermosetting resins during cure and subsequent thermal cycling. We use a recently developed thick-walled tube method to impose three-dimensional isotropic constraints oil the resin. The strains at the outer surface of the thick-walled tube are monitored by strain gauges. Experiments are performed for a closed tube where the resin is cured in the compressive state and in an open tube where tensile stresses build up at gelation. The cure-induced tensile stresses are much lower than expected from cure shrinkage due to the inability of the curing resin to sustain large tensile stresses in the gel-state. (c) 2005 Elsevier Ltd. All rights reserved.
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