Plastic surface strain mapping of bent sheets by image correlation

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In: Experimental Mechanics, 44(2004), 5, S. 502 - 511
Format: E-Article
Sprache: Englisch
veröffentlicht: Kluwer Academic Publishers
ISSN: 0014-4851
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finc.format ElectronicArticle
finc.mega_collection Springer Journals dswarm-105-MTAuMTAwNy9CRjAyNDI3OTYy
finc.record_id 10.1007/BF02427962
finc.source_id 105
ris.type EJOUR
rft.atitle Plastic surface strain mapping of bent sheets by image correlation
rft.eissn 1741-2765
rft.epage 511
rft.genre article
rft.issn 0014-4851
rft.issue 5
rft.jtitle Experimental Mechanics
rft.pages 502-511 Dordrecht Kluwer Academic Publishers 2004 2004-10-01T00:00:00Z
rft.stitle Experimental Mechanics
rft.spage 502
rft.volume 44
abstract A technique using a single CCD camera, a precision rotation/translation stage, a telecentric zoom lens, and digital image correlation software is described for measuring surface profiles and surface plastic strain distributions of a bent thin sheet. The measurement principles, based on both parallel and pinhole perspective projections, are outlined and the relevant mathematical equations for computing the profiles and displacement fields on a curved surface are presented. The typical optical setup as well as the experimental measurement and digital image correlation analysis procedure are described. The maximum errors in the in-plane and out-of-plane coordinates or displacements are about ±5 and ±25 μm, respectively, and the maximum errors in surface strain mapping are about 0.1% or less based on a series of evaluation tests on flat and curved sample surfaces over a physical field of view of 15.2 × 11.4 mm<Superscript>2</Superscript>. As an application example, the shape and surface plastic strain distribution example, the shape and surface plastic strain distributions around a bent apex of a flat 2 mm thick automotive aluminum AA5182-O sheet, which underwent a 90° bend with three bend ratios of 2<Emphasis Type="Italic">t</Emphasis>, 1<Emphasis Type="Italic">t</Emphasis>, and 0.6<Emphasis Type="Italic">t</Emphasis>, are determined using the proposed technique.
authors Tong Wei
doi 10.1007/BF02427962
languages eng
x.subjects 3D surface profiling measurement
3D surface deformation field measurement, sheet metal forming
optical strain mapping method