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An elastic molecular model for rubber inelasticity

  • Rubber materials are characterized by a variety of inelasticities such as softening behavior, hysteresis loops and permanent set. In order to calculate the inelastic material behavior, constitutive models, that describe rubber as a homogeneous continuum, have to make use of damping or friction elements. On the nanoscale, there is no need to adopt such rheological models. Inelastic materialRubber materials are characterized by a variety of inelasticities such as softening behavior, hysteresis loops and permanent set. In order to calculate the inelastic material behavior, constitutive models, that describe rubber as a homogeneous continuum, have to make use of damping or friction elements. On the nanoscale, there is no need to adopt such rheological models. Inelastic material behavior can be explained and simulated by a continuous rearrangement of bonds, in particular, the van der Waals interactions, and by the polymer chains transitioning between cis and trans equilibrium torsion angles. The discrete molecular dynamics simulations presented in this paper are performed in an explicit FEM environment using nonlinear but elastic force field potentials. From a structural mechanics point of view, topological changes of the polymer network can be interpreted as a sequence of local material instability problems due to negative tangential bond stiffnesses. In order to obtain representative results within reasonable computational time, the model is optimized with respect to the number of atoms and the loading velocity. It is shown that by increasing the model size, the stress–strain curves become independent of both the atoms initial state and the strain amplitudes.show moreshow less

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Metadaten
Document Type:Article (reviewed)
Zitierlink: https://opus.hs-offenburg.de/1894
Bibliografische Angaben
Title (English):An elastic molecular model for rubber inelasticity
Author:Lutz NasdalaStaff MemberORCiDGND, Andreas Kempe, Raimund Rolfes
Year of Publication:2015
Publisher:Elsevier
First Page:83
Last Page:99
Parent Title (English):Computational Materials Science
Volume:106
DOI:https://doi.org/10.1016/j.commatsci.2015.04.036
Language:English
Inhaltliche Informationen
Institutes:Fakultät Wirtschaft (W)
Institutes:Bibliografie
GND Keyword:Elastizität; Gummi
Formale Angaben
Open Access: Closed Access 
Licence (German):License LogoUrheberrechtlich geschützt