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Environmental Effects on the Mechanical Behaviour of Thermoplastic Toughened Phenolics

Published online by Cambridge University Press:  15 February 2011

A. R. Eccott ,
J. C. Arnold  and
D. H. Isaac
A. R. Eccott
Affiliation:
Department of Materials Engineering, University College, Swansea, U.K.
J. C. Arnold
Affiliation:
Department of Materials Engineering, University College, Swansea, U.K.
D. H. Isaac
Affiliation:
Department of Materials Engineering, University College, Swansea, U.K.
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Abstract

The environmental stress cracking (ESC) behaviour of thermoplastic toughened phenolics has been studied. As these materials have applications for ‘under the bonnet’ automotive components, testing took place in several ‘in - service’ environments and in some of the constituent chemicals as well as in air.

Initial screening of the materials using three point bend testing highlighted the most hostile environments for further study. More detailed creep tests were then performed with methanol and air. ESC effects led to an increase in creep rate which relates to crack initiation. Crack initiation is lowest at intermediate levels of thermoplastic with an optimum content of about 12%. It was found that there was a significant decrease in the creep rupture lifetimes as the fraction of thermoplastic toughening agent increased. With low thermoplastic content, crack blunting becomes an important factor.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 305: Symposium I – High-Performance Polymers and Polymer Matrix Composites , 1993 , 205
Copyright
Copyright © Materials Research Society 1993

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