Photoelasticity was also used for visual examination of the plastic zone
0] is power index of material hardening in elasto plastic zone
Thus, movement of the plastic zone
boundary is successfully simulated until elastic core completely disappears.
Even brittle adhesives must form a very small but finite plastic zone
These plastic zone
sizes are significantly smaller than the crack length, the uncracked ligament, and the specimen thickness.
The value (15) of the principal normal stresses are valid in plastic zone
under the ideal conditions the plastic flow.
The TOM micrographs indicate no plastic zone
for the neat resin, while a big plastic zone
was observed for the blend containing CSR particles with 20 wt% MMA units in their copolymer shell.
5) to much larger oval shape plastic zone
in the case of [beta]-nucleated iPP (see Fig.
It is known that the impression test is a localized test, which is associated with the evolution of the local plastic zone
underneath the punch.
Here, the plastic zone
appears as a, so-called, "stress-whitened zone".
To go further, one can see that the mechanical behaviours resulting from the two types of treatments are radically different: the surface treatments tend to extend the elastic zone without increasing the plastic zone
, whereas the main effect of coupling agents is to increase the plastic zone
and slightly the elastic domain together with a weak decrease of the Young's modulus.
p] is the size of the plastic zone
that can be estimated using the following equation: