Modeling and Computational Analysis of Fracture of Glassy Polymers

R. Estevez, E. van der Giessen, S. Basu

Research output: Chapter in Book/Report/Conference proceedingChapterAcademic

28 Citations (Scopus)
357 Downloads (Pure)

Abstract

Although it is recognized that failure of glassy polymers involves crazing and shear yielding, most of the studies of their fracture account for one or the other mechanism. We present a finite element analysis in which crazing and shear yielding are incorporated. Shear yielding is accounted for through the description of a three-dimensional constitutive law of the bulk material, while crazing is modeled by a cohesive surface which comprises the three stages of initiation, thickening, and craze fibril breakdown and related crack formation. The description is able to capture the main features of glassy polymer fracture such as the ductile-to-brittle transition at low rates and the evolution of the toughness with loading rate. In particular, it is demonstrated that the competition between shear yielding and crazing governs the material’s toughness. Even if the description of crazing presented here is essentially phenomenological, a cohesive zone formulation is shown to provide a consistent formulation to bridge descriptions of failure at the molecular length scale with analyses performed at the continuum scale.
Original languageEnglish
Title of host publicationINTRINSIC MOLECULAR MOBILITY AND TOUGHNESS OF POLYMERS II
EditorsHH Kausch
Place of PublicationBERLIN
PublisherSpringer
Pages195-234
Number of pages40
Volume188
ISBN (Print)3-540-26162-1
DOIs
Publication statusPublished - 2005

Publication series

NameAdvances in Polymer Science
PublisherSPRINGER-VERLAG BERLIN
Volume188
ISSN (Print)0065-3195

Keywords

  • crack tip plasticity
  • elastic-viscoplastic material
  • crazing
  • cohesive surface
  • fracture
  • DYNAMIC FRACTURE
  • POLY(METHYL METHACRYLATE)
  • CRAZE SHAPE
  • CRACK-TIP
  • CONSTITUTIVE MODEL
  • AMORPHOUS POLYMERS
  • TEMPERATURE
  • TOUGHNESS
  • PMMA
  • POLYCARBONATE

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