On the extent of dominance of asymptotic elastodynamic crack-tip fields: Part I-An experimental study using bifocal caustics

Sridhar Krishnaswamy, Ares J. Rosakis

Research output: Contribution to journalArticlepeer-review

38 Scopus citations

Abstract

The question of the domain of dominance of mode I asymptotic elastodynamic crack-tip fields is investigated experimentally for the cases of dynamically loaded stationary cracks as well as dynamically propagating cracks. The experiments reported are on three-point bend specimens loaded dynamically using a drop-weight tower. An optical configuration leading to a bifocal high-speed camera is proposed. This is used in conjunction with the method of caustics to obtain apparent dynamic stress intensity factor measurements simultaneously from two different regions around the crack tip. The results of this study indicate that three-dimensional and transient effects necessarily have to be taken into account in the interpretation of dynamic fracture experiments.

Original languageEnglish (US)
Pages (from-to)87-94
Number of pages8
JournalJournal of Applied Mechanics, Transactions ASME
Volume58
Issue number1
DOIs
StatePublished - Mar 1991

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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