Understanding shear bands characteristics and formation in model glasses through the measure of the local yield stress.

Many phenomena remain poorly understood in amorphous materials such as plasticity and shear banding, their brittleness and disordered structure making it difficult to study them experimentally. As a consequence, we employ a two-dimensional Lennard-Jones numerical model of glasses and measure their local yield stress, a measure of the local softness presented in [1]. This method is nonperturbative and gives access to a quantitative property on a well-controlled length scale. Applying it on deeply quench glasses under simple shear loading, we show that the plastic events create a local yield stress [2] decrease in the material which cause the emergence of a shear band [3]. We finally focus on the shear bands formation by looking for a relevant localization criterion to understand the influence of the system size and quench protocol.


[1] A. Barbot et al., Phys. Rev. E, 97, 033001 (2018)
[2] S. Patinet et al., arXiv::cond-mat/1906.09818 (2019)
[3] A. Barbot et al., arXiv::cond-mat/1906.09663 (2019)