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Proceedings Paper

Laser metrological measurement of transient strain fields in Hopkinson-bar experiments
Author(s): Dietmar Vogel; Bernd Michel; Werner F. Totzauer; Ulrich Schreppel; Rainer Clos
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Paper Abstract

Often the direct experimental analysis of deformation fields on crack specimens is a necessary tool accompanying the application of modern fracture mechanics concepts. A speckle photographic technique for the measurement of in-plane displacement fields and respective elements of the distortion tensor on crack specimen surfaces has been developed which includes automatic specklegram evaluation by means of digital image processing. Short Q-switch pulses of a ruby laser permit to freeze specklegrams from solid state waves travelling through crack specimens. Mode I crack opening strain fields on impact loaded specimens have been measured and compared with theoretic results.

Paper Details

Date Published: 1 December 1991
Proc. SPIE 1554, Second International Conference on Photomechanics and Speckle Metrology, (1 December 1991); doi: 10.1117/12.49546
Show Author Affiliations
Dietmar Vogel, Institute of Mechanics (Germany)
Bernd Michel, Institute of Mechanics (Germany)
Werner F. Totzauer, Institute of Mechanics (Germany)
Ulrich Schreppel, Technische Univ. Magdeburg (Germany)
Rainer Clos, Technische Univ. Magdeburg (Germany)

Published in SPIE Proceedings Vol. 1554:
Second International Conference on Photomechanics and Speckle Metrology
Fu-Pen Chiang; Fu-Pen Chiang, Editor(s)

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