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Moisture transport in PA6 and its influence on the mechanical properties

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Abstract

Various studies have reported the changes in the mechanical properties and the modification in morphology of polyamide due to the absorption of water. However, the relation between the local water content and the alteration in the properties has not been consolidated in a coupled model yet. In the current work, a simulation model is proposed that can capture the diffusion of water as well as simulate the effect of the local moisture content on the stiffness of polyamide (PA6). To this end, a finite element model was developed by coupling of a nonlinear diffusion model and a viscoelastic material model. The Galerkin finite element method was used to formulate the weak form of the equations for the two physical processes. The coupled nonlinear equations were solved with the help of the Newton method. The diffusion process was studied experimentally with the help of gravimetric measurements. Relaxation tests were conducted on the polyamide specimens that were saturated under different moisture levels. Based on these experimental results, the dependency of the material parameters on the local moisture content was identified and an efficient and stable numerical simulation model has been developed.

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Acknowledgements

The authors are grateful for the financial support provided by the German Science Foundation (DFG) under Project numbers Di 430/29-01, He 7079/5-01 and Sto 910/10-01.

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Authors and Affiliations

  1. Saarland University, Saarbrücken, Germany

    P. Sharma & S. Diebels

  2. TU Dortmund, Dortmund, Germany

    A. Sambale & M. Stommel

  3. Fraunhofer Institute for Non-Destructive Testing, Saarbrücken, Germany

    M. Maisl & H.-G. Herrmann

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  1. P. Sharma
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  2. A. Sambale
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  3. M. Stommel
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  4. M. Maisl
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Correspondence to P. Sharma.

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Communicated by Michael Johlitz, Lucien Laiarinandrasana,Yann Marco.

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Sharma, P., Sambale, A., Stommel, M. et al. Moisture transport in PA6 and its influence on the mechanical properties. Continuum Mech. Thermodyn. 32, 307–325 (2020). https://doi.org/10.1007/s00161-019-00815-w

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