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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 38, Iss. 19 — Jul. 1, 1999
  • pp: 4030–4036

Application of digital speckle photography to flash x-ray studies of internal deformation fields in impact experiments

Per Synnergren, H. Timothy Goldrein, and William G. Proud  »View Author Affiliations


Applied Optics, Vol. 38, Issue 19, pp. 4030-4036 (1999)
http://dx.doi.org/10.1364/AO.38.004030


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Abstract

A technique to measure two-dimensional deformation fields of a layer inside materials during dynamic events such as impact experiments is presented. Even optically opaque materials like cement can be evaluated when flash x rays are used. Blocks of polyester and cement were prepared with a layer of x-ray-absorbing lead particles. The specimens were then hit by a 9-mm-diameter steel sphere (ball bearing) fired from a 9-mm-bore gas gun at a velocity of 373.5 ± 3.0 ms-1. A 30-ns-long x-ray pulse exposed one radiograph before impact; another radiograph was exposed a short time after the impact on the specimen. The two-dimensional displacement field was obtained when the x-ray radiographs were digitized by a conventional flatbed scanner, and a digital speckle photography algorithm was used to calculate the displacements. The flash x-ray technique allowed examination of the deformation at the layer inside the material during failure, thus giving interesting data about the material flow field around the impactor.

© 1999 Optical Society of America

OCIS Codes
(000.2190) General : Experimental physics
(100.0100) Image processing : Image processing
(100.2000) Image processing : Digital image processing
(340.7440) X-ray optics : X-ray imaging

History
Original Manuscript: February 18, 1999
Revised Manuscript: April 13, 1999
Published: July 1, 1999

Citation
Per Synnergren, H. Timothy Goldrein, and William G. Proud, "Application of digital speckle photography to flash x-ray studies of internal deformation fields in impact experiments," Appl. Opt. 38, 4030-4036 (1999)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-38-19-4030


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