Study of the fracture toughness and fracture morphology of polybenzimidazole

J. F. Groves, C. M. Agrawal, G. W. Pearsall

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

Polybenzimidazole (PBI) is a relatively new polymeric material exhibiting unusual properties that are attributable to its aromatic-heterocyclic monomer structure. Owing to its high strength, stiffness and excellent stability in hostile chemical and thermal environments, PBI is being used increasingly in critical applications. As a result, understanding the failure mechanisms of the material is vital. This paper presents the results of a study of the fracture toughness and fracture morphology of polybenzimidazole. The standard compact tension specimen was used as the basic experimental specimen in this study. The fracture tests were performed in an Instron tensile testing machine. The effects of varying the loading rate, and the ratio of the initial crack length, a, to the ligament length, W, were investigated. The fracture surface morphology was examined using optical and scanning electron microscopy. The results of this study indicate that the precracking technique significantly affects the measured fracture toughness. Also, an increase in the loading rate causes a significant decrease in fracture toughness. Examination of the fracture morphology reveals that PBI fracture surfaces exhibit many of the characteristics expected of a tough engineering plastic.

Original languageEnglish (US)
Pages (from-to)2335-2339
Number of pages5
JournalJournal of Materials Science
Volume27
Issue number9
DOIs
StatePublished - May 1992
Externally publishedYes

Fingerprint

polybenzimidazole
fracture strength
Fracture toughness
loading rate
ligaments
thermal environments
Ligaments
Tensile testing
high strength
test equipment
Surface morphology
stiffness
plastics
cracks
monomers
examination
Monomers
Stiffness
engineering
Plastics

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Electronic, Optical and Magnetic Materials
  • Materials Science(all)

Cite this

Study of the fracture toughness and fracture morphology of polybenzimidazole. / Groves, J. F.; Agrawal, C. M.; Pearsall, G. W.

In: Journal of Materials Science, Vol. 27, No. 9, 05.1992, p. 2335-2339.

Research output: Contribution to journalArticle

Groves, J. F. ; Agrawal, C. M. ; Pearsall, G. W. / Study of the fracture toughness and fracture morphology of polybenzimidazole. In: Journal of Materials Science. 1992 ; Vol. 27, No. 9. pp. 2335-2339.
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