crazing


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crazing

[′krāz·iŋ]
(engineering)
A network of fine cracks on or under the surface of a material such as enamel, glaze, metal, or plastic.
(metallurgy)
Development of a network of cracks on a metal surface.

Crazing

In painting, a minute random cracking of a finish coat of paint due to uneven shrinking of the paint. In masonry, the appearance of very fine cracks while the surface is drying due to uneven contraction.

crazing, cracking, craze cracks

Fine, random cracks or fissures in a network on or under a surface of plaster, cement, mortar, concrete, ceramic coating, or paint film; caused by shrinkage.

crazing

A form of heat damage that occurs to transparent thermoplastic material. Canopies, side glasses, etc. are made of thermoplastic materials. Crazing manifests itself as a series of tiny, hairline cracks in the surface of the plastic. Crazing makes the plastic weak and reduces its transparency and in the worst cases, it makes the plastic become opaque.
References in periodicals archive ?
Crazing occurred at the temperature above 60[degrees]C and at the C[O.sub.2] pressure above 4 MPa, as indicated by open circle and filled circle, respectively.
Kramer, "Microscopic and Molecular Fundamentals of Crazing," in Advances in Polymer Science, Vols.
As the constraint was reduced, multiple crazing continued to blunt the tip but it was also accompanied by the formation of large voids.
The applied stress is believed to produce changes in the potential energy barrier in a way that decreases the height of the barrier in the direction of flow, enhancing reptation and conformational changes necessary for crazing.
The experimental factors include crazing stress, relative craze density, and strain rate.
Kausch, ed., Advances in polymer science 91/92, Crazing in Polymers, Spring-Verlag, Berlin (1990).
For this study, edge initiated crazes were eliminated from the analysis area since the bulk surface crazing is of greatest concern.
8, crazing and cavitations in rubber were observed in the whitened portion and crazing was observed in the non-whitened portion only on the surface of the broken piece.
Also, it is possible to learn whether or not limited crazing can trigger massive shear banding in the polymer matrix.
[8, 9] As the tensile rate increases the test piece transits from shear yield fracture to crazing fracture.
Qualitatively, the essential micro-mechanisms of yielding and fracture in rubber-modified polystyrene include: craze nucleation, rubber cavitation, formation of elastomeric fibrils, which prevent the crazing from coalescing, and, finally, fibril breakdown, which leads to macroscopic crack propagation.
(13) found that crazing occurred at a lower strain for annealed or slowly cooled samples than for freshly quenched samples.