#### Alladi Ramakrishnan Hall

#### On the yielding of solids

#### Juergen Horbach

##### University of Duesseldorf

*It is widely believed that flow in a crystalline solid can only be induced via the application of a finite stress. As a consequence, in the limit of zero strain rate, the steady-state stress of a deformed solid would not go to zero as in a Newtonian fluid, but it would approach a finite value (the yield stress). This would imply that under the application of an infinitesimal stress the crystalline solid is in a rigid, non-flowing state. However, fundamental arguments show that the appearance of a rigid crystal is a kinetic phenomenon, associated with finite time scales. If one waits sufficiently long, any crystalline solid would eventually flow as a response to an infinitesimal stress. The rigidity of amorphous solids, i.e. glasses, is due to the shift of the Newtonian regime to inaccessible long time scales below the glass transition.*

In my talk, I present studies on the yielding of solids under shear, using particle-based simulation techniques. The focus is on glasses as well as supercooled liquids where the response to a mechanical load is solid-like beyond the Newtonian regime.

Done