here we show that there are two concurrent contributions to their microscale quasi-static
shear modulus GI: one (μ) is related to the atomic bonding strength of solid-like regions and
the other (GII) to the change in the possible configurations of liquid-like regions (dynamic
relaxation). Through carefully designed high-rate nanoscale indentation tests, a simple
constitutive relation (μ= GI+ GII) is experimentally verified. On a fundamental level, our …