Role of Normal Stress in the Creep Dynamics and Failure of a Biopolymer Gel.

@article{Pommella2020RoleON,
  title={Role of Normal Stress in the Creep Dynamics and Failure of a Biopolymer Gel.},
  author={Angelo Pommella and Luca Cipelletti and Laurence Ramos},
  journal={Physical review letters},
  year={2020},
  volume={125 26},
  pages={
          268006
        }
}
We investigate the delayed rupture of biopolymer gels under a constant shear load by simultaneous dynamic light scattering and rheology measurements. We unveil the crucial role of normal stresses built up during gelation: All samples that eventually fracture self-weaken during the gelation process, as revealed by a partial relaxation of the normal stress concomitant to a burst of microscopic plastic rearrangements. Upon applying a shear stress, weakened gels exhibit in the creep regime… 

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