A phenomenological model for dynamic response of double-network hydrogel composite undergoing transient transition

作者：Lu, Haibao^*; Wang, Xiaodong; Shi, Xiaojuan; Yu, Kai; Fu, Yong Qing

来源：Composites Part B: Engineering , 2018, 151: 148-153.

DOI：10.1016/j.compositesb.2018.06.011

• Hydrogel
• Composite
• Transient network
• Constitutive relation

We present a phenomenological model for dynamic deformation and mechanical response of double-network (with short-chained ionic network and long-chained covalent network) hydrogel composite based on theory of transient networks. Molecular structures and stress-strain relations of the hydrogel composite were investigated based on thermomechanical properties of the individual network. Constitutive relations were derived for its nonlinear viscoelastic responses and annihilation/reformation rates of active short chains were determined by means of Eyring formula. An extended Volokh model was proposed to separate effects of large strain hysteresis and anomalous viscoelastic relaxation on the hydrogel composite after strain reversal. Experimental results from rate-independent tests are well in agreement with that of the numerical simulations. This study provides a fundamental simulation tool for modelling and predicting mechanics and mechanisms of viscoelastic response and mechanical responses in double-network hydrogel composite.

• 出版日期2018-10-15
• 单位哈尔滨工业大学