I know how these to deformation mechanisms are different from each other microscopically. However I am not sure about how crazing will differ from shear banding on macroscopic level (e.g. under naked eye) and how these two will be different from each other in affecting the tensile stress-strain curve? The objective is to relate the major deformation as crazing OR shear banding with the shape of tensile stress-strain curve.
Speaking of Crazing: it develops due to overstress in the very top (tip) of a craze and has a shape of a torchlight.
Shear Banding is related to slippery of separate fragments of bulk of polymer and is related to morphology of the bulk of semicrystalline polymer.
Both the processes proceed catastrophically - caused by overstress and practically do not require increase of stress level.
Best Regards, Leonid
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