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Incorporation of self-heating effect into a thermo-mechanical coupled constitutive modelling for elastomeric polyurethane

Jie Yang, Zisheng Liao, Deepak George, Mokarram Hossain Orcid Logo, Xiaohu Yao

Giant, Volume: 18, Start page: 100278

Swansea University Author: Mokarram Hossain Orcid Logo

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DOI (Published version): 10.1016/j.giant.2024.100278

Abstract

Elastomeric polyurethane (EPU) is characterised by distinctive mechanical properties, including high toughness, low glass transition temperature, and high impact resistance, that render it indispensable in diverse engineering applications from soft robotics to anti-collision devices. This study pres...

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Published in: Giant
ISSN: 2666-5425
Published: Elsevier BV 2024
Online Access: Check full text

URI: https://cronfa.swan.ac.uk/Record/cronfa66344
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Abstract: Elastomeric polyurethane (EPU) is characterised by distinctive mechanical properties, including high toughness, low glass transition temperature, and high impact resistance, that render it indispensable in diverse engineering applications from soft robotics to anti-collision devices. This study presents a thermo-mechanically coupled constitutive model for EPU, systematically incorporating hyperelasticity, viscoelasticity, thermal expansion, and self-heating effect in a thermodynamically consistent manner. Experimental data, obtained from previous studies, are then used for parameter identification and model validation, including iterative updates for temperature parameters considering the self-heating effect. Subsequently, the validated model is integrated into finite element codes, i.e., user subroutine to define a material’s mechanical behavior (UMAT) based on the commercial finite element software ABAQUS, for the computation of three-dimensional stress-strain states, facilitating the analysis of the structural response to various mechanical loads and boundary conditions. The results obtained from simulations are compared with analytical solutions to confirm the precision of Finite Element Method (FEM) implementation. The self-heating effect is further analysed under different strain rates and temperatures. To validate the engineering significance of the FEM implementation, a plate with a hole structure is also simulated. In conclusion, this research provides a robust tool for engineers and researchers working with soft materials, enhancing their understanding and predictive capabilities, notably addressing the self-heating effect in thermo-mechanical behaviours.
Keywords: Elastomeric polyurethane, Loading-unloading, Thermo-mechanically coupled constitutivemodelling, Finite element implementation, Self-heating effect, UMAT
College: Faculty of Science and Engineering
Funders: This research was funded by the National Science Fund for Distinguished Young Scholar (No. 11925203), the National Natural Science Foundation of China (No. 11672110), the Open Project Program of State Key Laboratory of TractionPower under Grant (No. TPL2003), and the financial support from the China Scholarship Council (CSC visiting PhD Fellowship No. 202206150100 to J. Yang). M. Hossain acknowledges the funding by EPSRC through the Supergen ORE Hub (EP/S000747/1), who have been awarded funding for the Flexible Fund project Submerged bi-axial fatigue analysis for flexible membrane Wave Energy Converters (FF2021-1036). M. Hossain also acknowledges the support of the EPSRC Impact Acceleration Account (EP/X525637/1) and the Royal Society (UK) through the International Exchange Grant (IEC/NSFC/211316).
Start Page: 100278

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