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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Editor: James C. Wyant
  • Vol. 46, Iss. 22 — Aug. 1, 2007
  • pp: 5083–5096

Measurement of transient deformations using digital image correlation method and high-speed photography: application to dynamic fracture

Madhu S. Kirugulige, Hareesh V. Tippur, and Thomas S. Denney  »View Author Affiliations


Applied Optics, Vol. 46, Issue 22, pp. 5083-5096 (2007)
http://dx.doi.org/10.1364/AO.46.005083


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Abstract

The digital image correlation method is extended to the study of transient deformations such as the one associated with a rapid growth of cracks in materials. A newly introduced rotating mirror type, multichannel digital high-speed camera is used in the investigation. Details of calibrating the imaging system are first described, and the methodology to estimate and correct inherent misalignments in the optical channels are outlined. A series of benchmark experiments are used to determined the accuracy of the measured displacements. A 2%–6% pixel accuracy in displacement measurements is achieved. Subsequently, the method is used to study crack growth in edge cracked beams subjected to impact loading. Decorated speckle patterns in the crack tip vicinity at rates of 225,000 frames per second are registered. Two sets of images are recorded, one before the impact and another after the impact. Using the image correlation algorithms developed for this work, the entire crack tip deformation history, from the time of impact to complete fracture, is mapped. The crack opening displacements are then analyzed to obtain the history of failure characterization parameter, namely, the dynamic stress intensity factor. The measurements are independently verified successfully by a complementary numerical analysis of the problem.

© 2007 Optical Society of America

OCIS Codes
(070.4560) Fourier optics and signal processing : Data processing by optical means
(100.2000) Image processing : Digital image processing
(120.0280) Instrumentation, measurement, and metrology : Remote sensing and sensors
(120.3940) Instrumentation, measurement, and metrology : Metrology
(120.6150) Instrumentation, measurement, and metrology : Speckle imaging
(350.4600) Other areas of optics : Optical engineering

ToC Category:
Image Processing

History
Original Manuscript: February 5, 2007
Manuscript Accepted: April 13, 2007
Published: July 9, 2007

Citation
Madhu S. Kirugulige, Hareesh V. Tippur, and Thomas S. Denney, "Measurement of transient deformations using digital image correlation method and high-speed photography: application to dynamic fracture," Appl. Opt. 46, 5083-5096 (2007)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-46-22-5083

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