Bauschinger effect in model glasses*

Once a material has experienced a significant plastic deformation, it it generally exhibits a softer stress response under reverse loading than under reloading in the original direction. The origin of this so-called Bauschinger effect, observable in various classes of materials remains poorly understood. We present here recent results obtained on two-dimensional model glasses at atomistic and mesoscopic scales. Using a numerical method developed in [1] we perform measurements of the local plastic thresholds in the steady state flow of a 2D model glasses under athermal quasi-static (AQS) deformation. Our results show evidence for the development of a forward-reverse asymmetry of the distribution of the residual strengths that can be directly connected with the Bauschinger effect [2].

[1] S. Patinet, D. Vandembroucq and M.L. Falk, Connecting Local Yield Stresses with Plastic Activity in Amorphous Solids, Phys. Rev. Lett. 117, 045501 (2016)
[2] S. Patinet et al., On the Origin of the Bauschinger Effect in Amorphous Solids arXiv:cond-mat/1906.09818 (2019)