Crazing and shear deformation in glass bead-filled glassy polymers

M.E.J. Dekkers, D. Heikens

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The competition between craze formation and shear band formation at small glass beads embedded in matrices of glassy polymers was investigated by performing const. strain rate tensile tests over a wide range of strain rates and temps., and examg. the deformation pattern formed at the beads with a light microscope. The glassy polymers under investigation were polystyrene [9003-53-6], polycarbonate, and two types of acrylonitrile-styrene copolymer [9003-54-7]. Besides matrix properties, strain rate and temp., the degree of interfacial adhesion between the glass beads and the matrix also has a profound effect on the competition between craze and shear band formation; at excellently adhering beads craze formation is favored, whereas at poorly adhering beads shear band formation is favored. This effect is caused by the difference in local stress situation, craze formation being favored under a triaxial stress state and shear band formation under a biaxial stress state. The kinetics of crazing and shear deformation were also studied, using a simple model and Eyring's rate theory of plastic deformation. The results suggest that chain scission may be the rate-detg. step in crazing but not in shear deformation. [on SciFinder (R)]
Original languageEnglish
Pages (from-to)3873-3880
JournalJournal of Materials Science
Issue number11
Publication statusPublished - 1985


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