An inverse method for determining the spatially resolved properties of viscoelastic–viscoplastic three-dimensional printed materials

Chen, X.; Ashcroft, I.; Wildman, Ricky D.; Tuck, Christopher

Abstract

A method using experimental nanoindentation and inverse finite-element analysis (FEA) has been developed that enables the spatial variation of material constitutive properties to be accurately determined. The method was used to measure property variation in a three-dimensional printed (3DP) polymeric material. The accuracy of the method is dependent on the applicability of the constitutive model used in the inverse FEA, hence four potential material models: viscoelastic, viscoelastic–viscoplastic, nonlinear viscoelastic and nonlinear viscoelastic–viscoplastic were evaluated, with the latter enabling the best fit to experimental data. Significant changes in material properties were seen in the depth direction of the 3DP sample, which could be linked to the degree of cross-linking within the material, a feature inherent in a UV-cured layer-by-layer construction method. It is proposed that the method is a powerful tool in the analysis of manufacturing processes with potential spatial property variation that will also enable the accurate prediction of final manufactured part performance.

Citation

Chen, X., Ashcroft, I., Wildman, R. D., & Tuck, C. (2015). An inverse method for determining the spatially resolved properties of viscoelastic–viscoplastic three-dimensional printed materials. Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences, 471(2183), Article 20150477. https://doi.org/10.1098/rspa.2015.0477

• Journal Article Type: Article
• Acceptance Date: Oct 22, 2015
• Publication Date: Nov 25, 2015
• Deposit Date: Jul 25, 2017
• Publicly Available Date: Jul 25, 2017
• Journal: Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences
• Print ISSN: 1364-5021
• Electronic ISSN: 1471-2946
• Publisher: The Royal Society
• Peer Reviewed: Peer Reviewed
• Volume: 471
• Issue: 2183
• Article Number: 20150477
• DOI: https://doi.org/10.1098/rspa.2015.0477
• Keywords: Nanoindentation test, Reactive inkjetting, Inverse finite-element analysis, Viscoelastic–viscoplastic
• Public URL: https://nottingham-repository.worktribe.com/output/765421
• Publisher URL: https://doi.org/10.1098/rspa.2015.0477