Crazing in two and three dimensions. 2. Three-dimensional crazing

Crazing in thick polymer glass films and bulk glassy polymers is theoretica lly investigated. A simple microscopic model that treats an amorphous polym er at stresses above the yield stress as a viscous fluid with the scale-dep endent surface tension is developed. Craze microstructural parameters inclu ding fibril diameter, spacing, and draw ratio are calculated. Crazing stres s and critical thickness are determined as functions of material parameters and conditions of testing. The obtained results are in good quantitative a greement with experimental data.