After the system crosses Stage 1 barrier, there is a brief period where the slope of pressure-time plot is negative, indicating that the system can sustain the applied strain. Subsequently, the curve reaches another minimum and the Stage 2 barrier is reached. This second barrier is associated with the expansion of vapor and formation of the bubble beyond groove dimensions. Beyond Stage 2, the system relaxes with applied strain and the pressure-time plot acquires a positive slope. In @ Û L r@ @ Û L zäsx@ @ Û L stätv@ @ Û L svätz@ (a) @ L r@ (b) @ L zäsx@ (d) @ L svätz@ (c) @ L stätv@