Fracture toughness of hydrogel laminates: Experiments, theory and modeling

IF 2.6 4区 工程技术 Q2 MECHANICS Journal of Applied Mechanics-Transactions of the Asme Pub Date : 2023-08-10 DOI:10.1115/1.4063144
Yijie Cai, Zihang Shen, Zheng Jia
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Abstract

Possessing enhanced mechanical durability and multiple novel functions, hydrogel laminates have found wide application in diverse areas including stretchable and bio-integrated electronics, soft robotics, tissue engineering and biomedical devices. In the above scenarios, hydrogels are often required to sustain large deformation without mechanical failure over a long time. Compared to the fast movement in functions design, the failure mechanism of hydrogel laminates has been much less explored and researched, as well as laminates' fracture toughness – a key parameter characterizing their fracture behavior. To address this largely unexplored issue, this paper further studies the fracture toughness of hydrogel laminates both experimentally and theoretically. A kind of modified pure-shear test suitable for measuring the fracture toughness of hydrogel laminates is proposed, which is then applied to testing a PAAm-PAA laminate's toughness. Through theoretical analysis and numerical modeling, the experimentally observed enhancement in the fracture toughness of PAAm-PAA laminates is explained – the fracture toughness of the laminates covers the energy required for both the crack and concomitant interfacial delamination to propagate, and the theoretical predictions agree well with the experimental results. The results from this study provide quantitative guidance for understanding the fracture behavior of hydrogel laminates.
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水凝胶层压板断裂韧性:实验、理论和模型
水凝胶层压板具有增强的机械耐久性和多种新功能,在可拉伸和生物集成电子、软机器人、组织工程和生物医学设备等各个领域都有广泛的应用。在上述情况下,通常需要水凝胶在很长一段时间内维持大变形而不发生机械故障。相对于功能设计的快速变化,对水凝胶层合板的破坏机理以及表征层合板断裂行为的关键参数断裂韧性的探索和研究相对较少。为了解决这一尚未解决的问题,本文从实验和理论两方面对水凝胶层合板的断裂韧性进行了进一步的研究。提出了一种适用于测定水凝胶层合板断裂韧性的改良纯剪切试验方法,并将其应用于PAAm-PAA层合板的断裂韧性测试。通过理论分析和数值模拟,解释了实验观察到的PAAm-PAA层合板断裂韧性的增强——层合板的断裂韧性涵盖了裂纹和伴随的界面分层扩展所需的能量,理论预测与实验结果吻合较好。研究结果为理解水凝胶层压板的断裂行为提供了定量指导。
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来源期刊
CiteScore
4.80
自引率
3.80%
发文量
95
审稿时长
5.8 months
期刊介绍: All areas of theoretical and applied mechanics including, but not limited to: Aerodynamics; Aeroelasticity; Biomechanics; Boundary layers; Composite materials; Computational mechanics; Constitutive modeling of materials; Dynamics; Elasticity; Experimental mechanics; Flow and fracture; Heat transport in fluid flows; Hydraulics; Impact; Internal flow; Mechanical properties of materials; Mechanics of shocks; Micromechanics; Nanomechanics; Plasticity; Stress analysis; Structures; Thermodynamics of materials and in flowing fluids; Thermo-mechanics; Turbulence; Vibration; Wave propagation
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