Crazing involves a localized or inhomogeneous plastic strain of the material. However, while plastic deformation essentially occurs at constant volume, crazing is a cavitation process that takes place with an increase in volume.

May 27, 2020 · Pre-melt stretching is an effective method to turn brittle polymers ductile and delay the onset of crazing. This feature article presents many experimental results in order to explain and advance our understanding on crazing during tensile deformation of glassy polymers.

Simply put, environmental stress cracking or crazing refers to internal (crazing) or external (cracking) fractures of the plastic material. This can occur in all plastics, and the extent of the fracturing will vary with stiffness and composition of the …

Mar 11, 2025 · Crazing stems from molecular tension during uneven drying, whereas cracking occurs when the top layer dries faster than underlying layers. High water content (exceeding …

Crazing is defined as an underlying mode of polymer fracture that occurs when excessive tensile stress leads to the formation of microvoids in a plane normal to the stress.

Aside from the occurrence of These results that, suggest star from ing a given extensive in the crazing damage zone, significant crack-tip AB-BCB-M! monomer, the lower the crosslink blunting is also observed (arrow).

In some cases small cracks develop on the plastic surface. This is termed “ crazing.” Discoloration and “ chalking ” may also be caused by UV degradation. When UV rays degrade organic molecules on the surface layer of plastics, they can cause plastics to appear yellow.

Jul 1, 1974 · Hot-setting epoxy systems, consisting of a bisphenol A diglycidyl ether resin cured with phthalic anhydride and dibutyl phthalate as plasticizing agent (mainly for photoelastic applications), exhibit crazing phenomena when processed at moderately high temperatures.

Crazing, although not as effective as shear banding, is a major source of toughening in polymers. For thermosetting polymers, however, crazing is thought to be unsuitable because of the inability of the crosslinked molecules to undergo significant molecular stretching and disentanglement, which are among the essential mechanisms for crazing to ...

Failure in tension of all thermoplastic polymers involves the formation of a craze through which a crack then grows. Crazes are most evident in glassy polymers (i.e. amorphous polymers below their glass transition temperature).