Experimental characterisation of the dilation angle of polymers
File(s)
Published version
Author(s)
Type
Journal Article
Abstract
Despite the wide use of Drucker-Prager plasticity-based models on polymers, the experimental measurement of the dilation angle, a critical parameter to fully describe the plastic potential, has been rarely reported in existing literature. This paper shows, for the first time, the experimental characterisation of the dilation angle of polymers over a wide range of plastic strain. These measurements were obtained from uniaxial compression experiments conducted on poly(methyl methacrylate) (PMMA) and an untoughened epoxy resin. The calculation of the dilation angle relied on the measurements of the compressive force and the strain components obtained via Digital Image Correlation (DIC). Lower values of dilation angle were obtained for the epoxy resin, suggesting that resistance to volumetric change during plastic deformation could be associated to molecular structure and internal forces. The methodology and results presented in this study can be applied to different types of materials and employed for developing and validating constitutive models that incorporate plastic dilation.
Date Issued
2023-08
Date Acceptance
2023-06-30
Citation
Polymer Testing, 2023, 125, pp.1-7
ISSN
0142-9418
Publisher
Elsevier BV
Start Page
1
End Page
7
Journal / Book Title
Polymer Testing
Volume
125
Copyright Statement
© 2023 The Authors. Published by Elsevier Ltd. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/).
License URL
Identifier
http://dx.doi.org/10.1016/j.polymertesting.2023.108137
Publication Status
Accepted
Article Number
108137
Date Publish Online
2023-07-01