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Plastic strain measurement in polypropylene using laser speckle technique

✍ Scribed by C.J. Tay; C.M. Yap; H.M. Shang; T.E. Tay

Publisher
Elsevier Science
Year
1995
Tongue
English
Weight
349 KB
Volume
48
Category
Article
ISSN
0924-0136

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✦ Synopsis

This paper presents a laser speckle technique and a computer based image processing system for strain measurement in plastics. A new correlation parameter, the Integrated Peak Spectral Intensity Coefficient H i is proposed. Test results on polypropylene specimens subjected to uni-axial stretching show a correlation between the Integrated Peak Spectral Intensity Coefficient H i and strain. The advantages of this method are its non-contacting nature, absence of gauge marks, no limitation on specimen design and it enables measurement of plastic strains of up to 40%.

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Abstraet--A laser speckle technique, together with a computer-based image processing system, was used to measure the extent of the elastic-plastic boundary ahead of a static mode 1 crack under small-scale yielding. The technique used a simple optical set-up and did not require surface contact with t