We propose a dynamical mechanism leading to the fluidization of soft-glassy amorphous mate-rial driven below the yield-stress by external mechanical fluctuations. The model is based on the combination of memory effect and non-linearity, leading to an accumulation of tiny effects over a long-term. We test this scenario on a granular packing driven mechanically below the Coulomb threshold. We bring evidences for an effective viscous response directly related to small stress modulations in agreement with the theoretical prediction of a generic secular drift.
@article{arxiv.1412.3288,
title = {Mechanical fluctuations suppress the threshold of soft-glassy solids : the secular drift scenario},
author = {Adeline Pons and Axelle Amon and Thierry Darnige and Jérôme Crassous and Eric Clément},
journal= {arXiv preprint arXiv:1412.3288},
year = {2015}
}