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Ageing of polymer bonds: a coupled chemomechanical modelling approach

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Abstract

With the increasing number of requirements on joinings, it gets more and more important to understand and predict an assemblies properties. Nowadays, in industrial applications, combinations of different materials get more common. In most of those cases, it is, besides other advantages, useful to connect such parts with adhesives to avoid local cells. Thus, the knowledge about the mechanical behaviour of adhesives over the whole time of utilisation is an essential element of engineering. As it is well known, ageing due to environmental influences such as oxygen, radiation, ozone and others plays a major role in polymers properties. So, for the prediction of applicability over the whole lifetime of a technical component, the change in mechanical properties due to ageing is necessary. In this contribution, we introduce a material model which takes into account the internal structure of an adhesive. Therefore, an interphase zone is introduced. In the interphase, which is developed due to the contact of an adhesive with an adherent, the materials properties change continuously from the surface to the centre of the joint, where the polymer is in a bulky state. Built up on this geometry dependency, the materials ageing as a function of the position is described. To model the change of the polymers state, we use a parameter representing chain scission processes and another one for the reformation of a new network. In a last step, the model is transferred into a finite element code for exemplary calculations.

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Authors and Affiliations

  1. Institute of Mechanics, Universität der Bundeswehr München, Werner-Heisenberg-Weg 39, 85577, Neubiberg, Germany

    Benedikt Dippel, Michael Johlitz & Alexander Lion

Authors
  1. Benedikt Dippel
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  2. Michael Johlitz
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  3. Alexander Lion
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Correspondence to Benedikt Dippel.

Additional information

Communicated by Andreas Öchsner.

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Dippel, B., Johlitz, M. & Lion, A. Ageing of polymer bonds: a coupled chemomechanical modelling approach. Continuum Mech. Thermodyn. 26, 247–257 (2014). https://doi.org/10.1007/s00161-014-0353-x

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