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Optical Engineering

High-speed moire photography for studying dynamic properties in carbon fiber composites
Author(s): L. Gunnar Melin
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Paper Abstract

A moire method for dynamic in-plane displacement measurement is used with the purpose of studying carbon fiber/epoxy composite specimens under tensile dynamic load. The displacement field is measured with a random noise level of less than 0.3 ?m and by using a high-speed camera, a framing speed of 1 million frames/s is achieved. Cracks propagating at speeds of 2000 m/s have been observed. To evaluate strain accurately from the displacement fields, a calibration for distortion in the high-speed image converter camera must be made. A method to measure the variable magnifications in the different frame areas of the camera back is described.

Paper Details

Date Published: 1 February 1998
PDF: 8 pages
Opt. Eng. 37(2) doi: 10.1117/1.601865
Published in: Optical Engineering Volume 37, Issue 2
Show Author Affiliations
L. Gunnar Melin, Lulea Univ. of Technology (Sweden)

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