Hyperelastic model for polyacrylamide-gelatin double network shape-memory hydrogels

• 作者: Yifu Chen Haohui Zhang Jiehao Chen Guozheng Kang Yuhang Hu
• 来源期刊: 力学学报（英文版）
• 年，卷（期）: 2021,（5）
• 所属期刊栏目: THEMED PAPERS ON "MECHANICS OF SOFT MATERIALS AND FLEXIBLE STRUCTURES"
• 页码范围: 748-756
• 页数: 9页
• 语种: 英文

摘要

A shape-memory double network hydrogel consists of two polymer networks:a chemically crosslinked primary network that is responsible for the permanent shape and a physically crosslinked secondary network that is used to fix the temporary shapes.The formation/melting transition of the secondary network serves as an effective mechanism for the double network hydrogel's shape-memory effect.When the crosslinks in the secondary network are dissociated by applying an external stimulus,only the primary network is left to support the load.When the secondary network is re-formed by removing the stimulus,both the primary and secondary networks support the load.In the past,models have been developed for the constitutive behaviors of double network hydrogels,but the model of shape-memory double network hydrogels is still lack-ing.This work aims to build a constitutive model for the polyacrylamide-gelatin double network shape-memory hydrogel developed in our previous work.The model is first calibrated by experimental data of the double network shape-memory hydrogel under uniaxial loading and then employed to predict the shape-fixing performance of the hydrogel.The model is also implemented into a three-dimension finite element code and utilized to simulate the shape-memory behavior of the double network hydrogel with inhomogeneous deformations related to applications.