On the two-potential constitutive modeling of dielectric elastomers
On the two-potential constitutive modeling of dielectric elastomers
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DOI：
10.1007/s11012-020-01179-1
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发表时间：
2020-06-08
期刊：
影响因子：
2.7
通讯作者：
Lopez-Pamies, Oscar
中科院分区：
文献类型：
--
作者：
Ghosh, Kamalendu;Lopez-Pamies, Oscar
这项工作为介电弹性体的本构模型铺设了双势框架。在介绍了均匀机电耦合、材料框架无差别、材料对称性和熵不平衡等约束条件后，利用该框架提出了一类重要的各向同性不可压缩介电弹性体的具体本构模型。该模型解释了这类材料的非高斯弹性和电致伸缩，以及由于粘性耗散引起的变形增强剪切变薄和由于电场耗散导致的随时间变化的极化。讨论了该模型的主要理论和实用特点，特别强调了它在小变形和中等电场范围内的特殊性。本文的最后部分致力于该模型的部署，以全面描述一种具有商业意义的介电弹性体，即来自3M的丙烯酸酯弹性体VHB 4910的机电行为。
This work lays out the two-potential framework for the constitutive modeling of dielectric elastomers. After its general presentation, where the constraints imposed by even electromechanical coupling, material frame indifference, material symmetry, and entropy imbalance are all spelled out, the framework is utilized to put forth a specific constitutive model for the prominent class of isotropic incompressible dielectric elastomers. The model accounts for the non-Gaussian elasticity and electrostriction typical of such materials, as well as for their deformation-enhanced shear thinning due to viscous dissipation and their time-dependent polarization due to electric dissipation. The key theoretical and practical features of the model are discussed, with special emphasis on its specialization in the limit of small deformations and moderate electric fields. The last part of this paper is devoted to the deployment of the model to fully describe the electromechanical behavior of a commercially significant dielectric elastomer, namely, the acrylate elastomer VHB 4910 from 3M.