Assessment of an instrumented Charpy impact machine

Anton Shterenlikht*, Sayyed H. Hashemi, John R. Yates, Ian C. Howard, Robert M. Andrews

*Corresponding author for this work

Research output: Contribution to journalArticle (Academic Journal)peer-review

19 Citations (Scopus)

Abstract

The dynamic responses of the standard Charpy impact machine were studied experimentally using strain gauges and accelerometer attached to the striker and the rotary position sensor fixed at the rotating axis and numerically with the finite element analysis. The fracture propagation was simulated with the cellular automata finite element approach developed earlier. A series of low velocity as well as full capacity Charpy tests were analysed. It was found that the strain gauge signal recorded close to the tup edge and the acceleration recorded at the back of the striker do not match. The energy calculated with the strain gauge data agrees well with the dial reading, while the energy calculated with the accelerometer signal is never near it. Frequencies close to the first natural frequency of the Charpy sample have high modal magnitudes in the acceleration signal but are effectively damped in the strain gauge response. Vibrations of the striker arm have highest modal magnitudes in the rotary position sensor. A low-pass filter is used to obtain the striker movements. The finite element analysis partly supports the experimental observations but also suggests that acceleration at the tup edge suffers higher oscillations than strain.

Original languageEnglish
Pages (from-to)81-97
Number of pages17
JournalInternational Journal of Fracture
Volume132
Issue number1
DOIs
Publication statusPublished - 1 Mar 2005

Keywords

  • Accelerometer
  • Charpy test
  • FEA
  • Rotary position sensor
  • Strain gauge

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