Fracture resistance of polyacrylamide-alginate hydrogels

• Published in: Engineering fracture mechanics 2024-01, Vol.295, p.109812, Article 109812
• Main Authors: Reinhards-Hervás, C., Cano, A.J., Rico, A., Salazar, A., Rodríguez, J.
• Format: Article
• Language: English
• Subjects: Fracture; Polyacrylamide-alginate hydrogel
• ISSN: 0013-7944; 1873-7315
• DOI: 10.1016/j.engfracmech.2023.109812

•Similar fracture behaviour through rubbers method and nonlinear fracture mechanics.•A tearing modulus parameter dependent on the strain energy density is proposed.•Crack blunting holds constant during crack propagation.•Steady regime during crack propagation.•Strain field at crack front maintains constant during crack propagation.•Alginate content increase fracture resistance and crack stability. Polyacrylamide-alginate hydrogels are biphasic materials with double-polymeric structure and considerable percentage of water inside. They exhibit complex mechanical behaviour in which finite deformations, non-linearity and time dependence are mixed. Fracture behaviour is less known, and this work analyses the fracture resistance obtained via methodologies of non-linear elastic materials such as that developed by Rivlin and Thomas and that attained with Non-Linear Fracture Mechanics procedures based on the use of J-integral. Special attention is paid to the fracture parameters on both crack growth initiation and crack propagation stages. The validity of the methodologies was evaluated, and conclusions were drawn about the effect of the alginate content on the fracture resistance of polyacrylamide.