ABSTRACT
In this contribution, the phenomenological modelling of the curing process and the corresponding mechanical behaviour of a PU based adhesive is considered. To characterise the underlying chemical reaction of the curing process, differential scanning calorimetry tests were carried out. Moreover, uniaxial tension tests on the fully cured material were conducted and revealed typical behaviour of elastomers, like hysteresis, Mullins effect and permanent set. Based on the experimental results, a constitutive model has been formulated to capture the mechanical behaviour of the material in the fully cured state as well as during the curing process. The rubber-like behaviour of the fully cured state is described by the help of the MORPH constitutive model, which is able to capture typical phenomena of elastomers. Additionally, the chemical curing process itself is regarded by a so called degree of cure. Based on this variable, it is shown how the MORPH model may be extended to capture the mechanical behaviour during the curing process.
