Stress Whitening

It is the appearance of white regions in a TP when it is stressed. A stress-whitening zone may be a sign of crazing in some plastics where individual fine crazes may be difficult to detect. Stress whitening occurs fairly late in the rupture stage, just prior to yielding. The surface takes on a whitish appearance in regions that are under high stress. It is usually associated with yielding. For practical purposes, stress whiting is the result of the formation of microcracks or crazes that is a form of damage.

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