Experimental Validation Of A Thermal Model Of
Adhesively Bonded Scarf Repairs For CFRP
Composite Materials Incorporating Cure Kinetics
Author(s)
C. C. N. Bestley, S. G. R. Brown & S. M. Alston
Abstract
Adhesively bonded scarf repairs are the preferred method of repairing modern
composite structures as they provide high strength restoration and aerodynamic
flushness. Curing of the adhesive bondline is carried out by locally heating the
repair area. To assess repair design and heating practices simulation can be used
to model both the transient heat transfer during curing and the level of cure likely
to be achieved at different regions in the adhesive joint. In this paper a 3D curing
model is described to simulate heat transfer through a composite component. The
cure kinetics of a commercial epoxy resin adhesive have been determined using
isothermal Differential Scanning Calorimetric (DSC) analysis. Using these
kinetics the model is able to determine the influence of the exothermic reaction
within the adhesive on the overall temperature variation within the component.
An experimental programme has been carried out where composite material and
bonded repair patches have been cured with thermocouples providing measured
temperature/time data during the cycle. The results from the cure model are then
validated by comparison with these experimental results. The cure model is
capable of being used to optimise the cure cycle for a bonded repair, ensuring the
maximum degree of cure of the adhesive with minimum variation of temperature
within the bond line.
Keywords: cure kinetics, DSC analysis, numerical model.
1 Introduction
The increase in use of composites in the aerospace, automotive and civil
engineering industries has led to the increasing demand for development of
Keywords
cure kinetics, DSC analysis, numerical model
Related Book
Other papers in this volume
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