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

IF 5.4 1区 化学 Q2 CHEMISTRY, MULTIDISCIPLINARY GIANT Pub Date : 2024-05-06 DOI:10.1016/j.giant.2024.100278
Jie Yang , Zisheng Liao , Deepak George , Mokarram Hossain , Xiaohu Yao
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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 behaviour (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.

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将自热效应纳入弹性聚氨酯的热机械耦合构造模型中
弹性聚氨酯(EPU)具有独特的机械性能,包括高韧性、低玻璃化转变温度和高抗冲击性,使其在从软体机器人到防撞装置等各种工程应用中不可或缺。本研究提出了 EPU 的热机械耦合结构模型,以热力学一致的方式系统地纳入了超弹性、粘弹性、热膨胀和自热效应。然后,利用先前研究获得的实验数据进行参数识别和模型验证,包括考虑自热效应的温度参数迭代更新。随后,将验证后的模型集成到有限元代码中,即基于商业有限元软件 ABAQUS 的定义材料力学行为(UMAT)的用户子程序,用于计算三维应力-应变状态,便于分析各种力学载荷和边界条件下的结构响应。模拟结果与分析结果进行了比较,以确认有限元法(FEM)实施的精确性。在不同的应变率和温度条件下,进一步分析了自加热效应。为了验证有限元法实施的工程意义,还模拟了带孔结构的板。总之,这项研究为从事软材料研究的工程师和研究人员提供了一个强大的工具,增强了他们的理解和预测能力,特别是解决了热机械行为中的自热效应问题。
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来源期刊
GIANT
GIANT Multiple-
CiteScore
8.50
自引率
8.60%
发文量
46
审稿时长
42 days
期刊介绍: Giant is an interdisciplinary title focusing on fundamental and applied macromolecular science spanning all chemistry, physics, biology, and materials aspects of the field in the broadest sense. Key areas covered include macromolecular chemistry, supramolecular assembly, multiscale and multifunctional materials, organic-inorganic hybrid materials, biophysics, biomimetics and surface science. Core topics range from developments in synthesis, characterisation and assembly towards creating uniformly sized precision macromolecules with tailored properties, to the design and assembly of nanostructured materials in multiple dimensions, and further to the study of smart or living designer materials with tuneable multiscale properties.
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