NON NEWTONIAN SYSTEMS PLASTIC FLOW 

Types of flow
Newtonian flow
Non- Newtonian flow
Plastic :
Once yield value has been exceeded , any further increase in shearing stress (F-f) brings about a directly proportional increase in G, rate of shear.
“ a plastic system resembles a Newtonian system at shear stresses above the yield value”
Pseudoplastic
Dilatant