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https://hdl.handle.net/20.500.14279/29036
Title: | On the Use of a Non-Constant Non-Affine or Slip Parameter in Polymer Rheology Constitutive Modeling | Authors: | Nikiforidis, Vasileios-Martin Tsalikis, Dimitrios G. Stephanou, Pavlos S. |
Major Field of Science: | Engineering and Technology | Field Category: | Chemical Sciences | Keywords: | Unentangled systems;Constitutive modeling;Materials functions;Non-affine parameter;Slip parameter;Conformation tensor;NEMD simulations;Atomistic simulations;Polyethylene | Issue Date: | Dec-2022 | Source: | Dynamics, 2022, vol. 2, no. 4, pp. 380-398 | Volume: | 2 | Issue: | 4 | Start page: | 380 | End page: | 398 | Journal: | Dynamics | Abstract: | Since its introduction in the late 1970s, the non-affine or slip parameter, ξ , has been routinely employed by numerous constitutive models as a constant parameter. However, the evidence seems to imply that it should be a function of polymer deformation. In the present work, we phenomenologically modify a constitutive model for the rheology of unentangled polymer melts [P. S. Stephanou et al. J. Rheol. 53, 309 (2009)] to account for a non-constant slip parameter. The revised model predictions are compared against newly accumulated rheological data for a C48 polyethylene melt obtained via direct non-equilibrium molecular dynamics simulations in shear. We find that the conformation tensor data are very well predicted; however, the predictions of the material functions are noted to deviate from the NEMD data, especially at large shear rates. | URI: | https://hdl.handle.net/20.500.14279/29036 | ISSN: | 26738716 | DOI: | 10.3390/dynamics2040022 | Rights: | © by the authors. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license. | Type: | Article | Affiliation : | Cyprus University of Technology University of Patras |
Publication Type: | Peer Reviewed |
Appears in Collections: | Άρθρα/Articles |
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dynamics-02-00022-v3.pdf | 5.97 MB | Adobe PDF | View/Open |
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