1 December 1991 Laser metrological measurement of transient strain fields in Hopkinson-bar experiments
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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.
© (1991) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Dietmar Vogel, Dietmar Vogel, Bernd Michel, Bernd Michel, Werner F. Totzauer, Werner F. Totzauer, Ulrich Schreppel, Ulrich Schreppel, Rainer Clos, Rainer Clos, } "Laser metrological measurement of transient strain fields in Hopkinson-bar experiments", Proc. SPIE 1554, Second International Conference on Photomechanics and Speckle Metrology, (1 December 1991); doi: 10.1117/12.49546; https://doi.org/10.1117/12.49546
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