To study temperature‐induced changes in the specific enthalpy of materials, the differential scanning calorimetry technique (DSC) is a powerful experimental approach. It is well‐established in physical chemistry and materials science but less familiar in continuum mechanics. In this context, the balance equation of energy in conjunction with the theory of internal variables is the fundamental aspect from the point of view of continuum mechanics. This paper presents the theoretical fundamentals of how to take classical and temperature‐modulated DSC tests into account in order to model or identify the thermochemical parts of the specific‐free energy, which is the most commonly used thermodynamic potential in continuum mechanics. The numerical examples treated in this work provide an insight into the possibilities of the DSC technique and into the constitutive representation of exothermal energy changes in curing adhesives.
There are many applications of curing epoxy resins. The paste-like material can be applied to joint two structural parts of different materials. The curing reaction in the epoxy resin increases the stiffness of the material to fix the connected partners. Furthermore, the curing epoxy resin shrinks and the reaction generates exothermal energy. In order to characterise the exothermal reaction, experimental results of dynamic scanning calorimetry are presented. The change in the viscoelastic behaviour is measured with the rheometer AR-G2 of TA-Instruments. In addition, investigations of the shrinkage behaviour are presented. Based on the observed changes during the curing reaction a thermodynamic consistent material model for small deformations is introduced and the parameters of the material model are identified to reproduce the experimental data.
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