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The Physics of Deformation and Fracture of Polymers by Ali Argon

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11 Crazing in glassy homo- and hetero-polymers

11.1 Overview

Glassy polymers that possess a comparatively very high shear yield strain for distortional plasticity, bordering on 0.1 at low temperatures, exhibit an alternative form of plasticity by a planar dilatational localization in tensile strain fields at lower applied strain levels than for distortional plasticity. This planar dilatational localization process, which is referred to as crazing, in analogy to the superficial cracking of glazes on ceramics, is an important mechanical response form that ranges from precipitating brittle behavior, when uncontrolled, to resulting in quite considerable levels of toughness, when properly controlled. In most glassy homo-polymers at low temperatures ...

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