双网络水凝胶损伤本构模型研究进展

Progress in the Damage Constitutive Modelling of Double-Network Hydrogels

新型高分子生物材料——双网络水凝胶不仅保持了传统水凝胶优良的物理性质,而且具有超高的刚度、强度和韧性等优异的力学性能,具有广阔的应用前景。它们在大变形下表现出应力软化、颈缩、应变硬化、损伤各向异性和损伤交叉效应等复杂的非线性力学行为。研究双网络水凝胶的损伤力学十分必要。本文聚焦共价交联型双网络水凝胶,描述了它们在实验中观察到的力学行为以及相应的微观损伤机理,介绍了现有的损伤本构模型,并概括了这些模型的优点与不足,最后对双网络水凝胶的损伤力学研究进行了简明扼要的展望。

Double-network hydrogel,a new polymer biomaterial,not only maintains the excellent physical properties of traditional hydrogels,but also has outstanding mechanical properties such as super-high stiffness,strength and toughness.Such superior materials have great application prospects.Complex mechanical behaviors,such as stress softening,necking phenomenon,strain hardening,damage anisotropy and damage cross effect etc.,have been observed in double-network hydrogels under large deformation.Studying the damage mechanics of double-network hydrogels is pretty necessary.This paper focus on the traditional covalently crosslinked double-network hydrogels.Their mechanical behaviors and the underlying mechanisms are descripted.The existing damage models are introduced with summarizations of their capabilities and limitations.Moreover,existing researches on the damage mechanics of double-network hydrogels are briefly reviewed.