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Application of digital speckle photography to flash x-ray studies of internal deformation fields in impact experiments
Luleå tekniska universitet.
Department of Physics and Chemistry of Solids, Cavendish Laboratory, University of Cambridge.
Department of Physics and Chemistry of Solids, Cavendish Laboratory, University of Cambridge.
1999 (English)In: Applied Optics, ISSN 1559-128X, E-ISSN 2155-3165, Vol. 38, no 19, p. 4030-4036Article in journal (Refereed) Published
Abstract [en]

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.

Place, publisher, year, edition, pages
1999. Vol. 38, no 19, p. 4030-4036
National Category
Applied Mechanics
Research subject
Experimental Mechanics
Identifiers
URN: urn:nbn:se:ltu:diva-3724DOI: 10.1364/AO.38.004030Scopus ID: 2-s2.0-0344641918Local ID: 18ee4140-ff22-11db-b19d-000ea68e967bOAI: oai:DiVA.org:ltu-3724DiVA, id: diva2:976584
Note
Godkänd; 1999; 20070510 (cira)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved

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