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Journal of Materials Science

, Volume 24, Issue 6, pp 1984–1990 | Cite as

Residual stresses and the optimum cure cycle for an epoxy resin

  • J. Hodges
  • B. Yates
  • M. I. Darby
  • G. H. Wostenholm
  • J. F. Clemmet
  • T. F. Keates
Article

Abstract

Residual stresses in carbon fibre-reinforced plastic composites arise because of the large difference in thermal expansion of the fibres and matrix. It has been suggested that these stresses might be reduced in epoxy resin matrices by curing at a lower temperature. Experiments have been made on five curing cycles, to test this possibility and to study the variations of viscosity and volume changes of the resin under different cure conditions. DSC experiments have also been made to determine the degree of cure at various stages of the cycles. It was found that a cycle with the low peak temperature of 120°C required a prohibitively long length of time to produce a complete cure. Of the other cycles studied, it is predicted that it would be advantageous, in reducing residual stresses, to use a peak temperature of 160°C, rather than 175°C, provided that a dwell of 18 min is included at 160°C to ensure a complete cure.

Keywords

Polymer Viscosity Epoxy Residual Stress Thermal Expansion 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Chapman and Hall Ltd. 1989

Authors and Affiliations

  • J. Hodges
    • 1
  • B. Yates
    • 1
  • M. I. Darby
    • 1
  • G. H. Wostenholm
    • 1
  • J. F. Clemmet
    • 2
  • T. F. Keates
    • 2
  1. 1.Department of Pure and Applied PhysicsUniversity of SalfordSalfordUK
  2. 2.British Aerospace plcSpace and Communications DivisionStevenageUK

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