classical rate-independent models for viscoelastic fracture do not work!

It is 50 years that people use models of viscoelastic fracture which assume the fracture energy in the process zone is independent on the crack speed. This has been assumed in the cohesive models by Knauss and Schapery and then by the dissipation theory of de gennes and Persson-Brener.  Researchers like to use this model because it is simple.   Unfortunately, it does not work, as we show in adhesion experiments in the recent JMPS paper attached.   We obtain nice results for a broad band power law material, but these results only work at very low speeds. So please researchers, try to find a better model, although the classical model is so easy to use! 

https://www.sciencedirect.com/science/article/abs/pii/S0022509624003107…

Thanks, 

MC