Modelling Of Viscoelastic Properties Of A
Curing Adhesive
Author(s)
J. de Vreugd, K. M. B. Jansen, L. J. Ernst
& J. A. C. M. Pijnenburg
Abstract
Thermoset adhesives are widely used in high tech applications to join two bodies
together. The main advantages of using adhesives are the low weight of the
construction and the easy way to apply the adhesive to the surfaces which have
to be fixed together. The disadvantage of thermoset adhesives however is that
cure shrinkage occurs. Shrinkage and evolution of mechanical properties during
cure leads to development of internal stresses. In this paper, the mechanical
behaviour of a curing adhesive is investigated. In the case of using a thermoset
adhesive in high precision applications like optical instruments, care should be
taken. Small displacements and distortions of important components caused by
cure shrinkage may already lead to malfunctioning. For this reason a material
model suitable for implementation in a finite element program is developed to
predict stresses and strains in glued objects. The temperature and cure dependent
viscoelastic shear modulus of the adhesive are obtained by using Dynamic
Mechanical Analyzing methods. The bulk modulus is obtained at fully cured
state with a high pressure dilatometer. Curing-time–time superposition is applied
to model the shear modulus at any state of cure. It is assumed that the bulk
modulus remains constant during cure. The kinetics of the adhesive is
investigated by using Dynamic Scanning Colorimetric techniques. The relation
between time and degree of cure is modelled by making use of the Kamal-
Sourour equation. Also diffusion limitation is added to this equation. The cure
shrinkage of the adhesive is experimentally determined by making use of the
principle of Archimedes. Finally a validation experiment is performed. The
validation experiment is simulated in the finite element program ABAQUS and
compared with the experiment. It turned out that the developed material model is
accurate enough to predict reaction forces, stresses and strains caused by cure
shrinkage.
Keywords: adhesive, cure shrinkage, DMA, DSC, viscoelastic properties.
Keywords
adhesive, cure shrinkage, DMA, DSC, viscoelastic properties.
Related Book
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