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 ?
Kramer, "Microscopic and Molecular Fundamentals of Crazing," in Advances in Polymer Science, Vols.
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.
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.
The crazing pattern outside the birefringent zone is optically similar to that observed in neat PP (23).
8, 9] As the tensile rate increases the test piece transits from shear yield fracture to crazing fracture.
This stress-whitening phenomenon in transparent plastics is associated with light scattering, which is induced by the formation of the craze structure and serves as a convenient indicator of the onset of crazing.
According to Sternstein and Ongchin (6, 7) crazing should occur when the stress bias [[Sigma].
It was suggested that a variety of fracture behavior could be classified into three types of ductile fracture without whitening (Fracture I), ductile fracture with whitening (Fracture II), and brittle fracture with little whitening (Fracture III), and that shear yielding occurs mainly in Fracture 1, both shear yielding and crazing occur in Fracture II, and rubber deformation and partial crazing occur in Fracture III.
They reported that impact strength improvement was caused by crazing in the case of the MS/SBS system, and by the voids generated in the neighborhood of particles in the case of PE/CaC[O.