Fracture of dual crosslink gels with permanent and transient crosslinks - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Extreme Mechanics Letters Année : 2016

Fracture of dual crosslink gels with permanent and transient crosslinks

Résumé

We have carried out systematic fracture experiments in a single edge notch geometry over a range of stretch rates on dual crosslink hydrogels made from polyvinyl alcohol chains chemically crosslinked with glutaraldehyde and physically crosslinked with borate ions. If the energy release rate necessary for crack propagation was calculated conventionally, by using the work done to deform the sample to the critical value of stretch c where the crack propagates, we found that the fracture energy  peaks around ~ 0.001 s-1 before decreasing sharply with increasing stretch rate, in contradiction with the measurements of crack velocity. Combining simulations and experimental observations, we propose therefore here a general method to separate the energy dissipated during loading before crack propagation, from that which is dissipated during crack propagation. For fast loading rates (with a characteristic strain rate only slightly lower than the inverse of the typical breaking time of physical bonds), this improved method to estimate a local energy release rate glocal at the onset of crack propagation, gives a value of the local fracture energy  local which is constant, consistent with the constant value of the crack propagation velocity measured experimentally. Using this improved method we also obtain the very interesting result that the dual crosslink gels have a much higher value of fracture energy at low loading rates than at high loading rates, contrary to the situation in classical chemically crosslinked elastic networks.
Fichier principal
Vignette du fichier
Mayumi_2015_EML.pdf (1.08 Mo) Télécharger le fichier
Origine : Fichiers produits par l'(les) auteur(s)
Loading...

Dates et versions

hal-01338987 , version 1 (29-06-2016)

Identifiants

Citer

Koichi Mayumi, Jingyi Guo, Tetsuharu Narita, Chung Yuen, Costantino Creton. Fracture of dual crosslink gels with permanent and transient crosslinks. Extreme Mechanics Letters, 2016, 6, pp.52-59. ⟨10.1016/j.eml.2015.12.002⟩. ⟨hal-01338987⟩
182 Consultations
167 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More