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Evaluation of volume deformation from surface DIC measurement

Evaluation of volume deformation from surface DIC measurement
Evaluation of volume deformation from surface DIC measurement

Stereo-DIC allows to track with a high accuracy the shape change and the surface displacement field of objects during deformation processes. When multiple camera arrangements are used, the shape and deformation measurement can be performed over the whole surface of the object. We submit that, in the case of intact specimens, with no internal defects and/or discontinuities, such boundary information can be used to estimate the internal displacement field by using proper interpolation functions. This calculation could serve, for instance, to evaluate the strain localization that occurs in metal specimens subjected to plastic deformation, hence allowing to get a better insight in the necking initiation and fracture propagation processes. In this paper, an interpolation method based on Bézier curves is developed and tested using simulated and real experiments on specimens with flat and cylindrical geometries. In particular, the deformation behaviour in the necking zone was investigated in the case of highly ductile and anisotropic materials. Numerical models were used to validate the method while the application to two real experiments demonstrated its feasibility in practical cases. The applicability of the method to more complex loading cases (e.g., bending, torsion, mixed-loads) or different initial shapes (e.g., curved beams, notches) will be investigated in future studies.

3D volume reconstruction, Bézier curves, Large deformation, Necking, Stereo-DIC
0014-4851
1181-1194
Rossi, M.
bfeecd16-516a-414d-b97d-a4c03ca384ac
Cortese, L.
a917ac4f-7be3-4d79-8501-00dba549105e
Genovese, K.
6f62fc16-f085-4100-bbef-bb5c285a65bf
Lattanzi, A.
93d7ad5d-91ae-49d3-b959-55413824df9f
Nalli, F.
bf13f67b-a633-4425-afc9-11bf5716da0f
Pierron, F.
a1fb4a70-6f34-4625-bc23-fcb6996b79b4
Rossi, M.
bfeecd16-516a-414d-b97d-a4c03ca384ac
Cortese, L.
a917ac4f-7be3-4d79-8501-00dba549105e
Genovese, K.
6f62fc16-f085-4100-bbef-bb5c285a65bf
Lattanzi, A.
93d7ad5d-91ae-49d3-b959-55413824df9f
Nalli, F.
bf13f67b-a633-4425-afc9-11bf5716da0f
Pierron, F.
a1fb4a70-6f34-4625-bc23-fcb6996b79b4

Rossi, M., Cortese, L., Genovese, K., Lattanzi, A., Nalli, F. and Pierron, F. (2018) Evaluation of volume deformation from surface DIC measurement. Experimental Mechanics, 58 (7), 1181-1194. (doi:10.1007/s11340-018-0409-0).

Record type: Article

Abstract

Stereo-DIC allows to track with a high accuracy the shape change and the surface displacement field of objects during deformation processes. When multiple camera arrangements are used, the shape and deformation measurement can be performed over the whole surface of the object. We submit that, in the case of intact specimens, with no internal defects and/or discontinuities, such boundary information can be used to estimate the internal displacement field by using proper interpolation functions. This calculation could serve, for instance, to evaluate the strain localization that occurs in metal specimens subjected to plastic deformation, hence allowing to get a better insight in the necking initiation and fracture propagation processes. In this paper, an interpolation method based on Bézier curves is developed and tested using simulated and real experiments on specimens with flat and cylindrical geometries. In particular, the deformation behaviour in the necking zone was investigated in the case of highly ductile and anisotropic materials. Numerical models were used to validate the method while the application to two real experiments demonstrated its feasibility in practical cases. The applicability of the method to more complex loading cases (e.g., bending, torsion, mixed-loads) or different initial shapes (e.g., curved beams, notches) will be investigated in future studies.

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Manuscript_rev2_ExpMech - Accepted Manuscript
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More information

Accepted/In Press date: 10 June 2018
e-pub ahead of print date: 19 June 2018
Published date: 2018
Keywords: 3D volume reconstruction, Bézier curves, Large deformation, Necking, Stereo-DIC

Identifiers

Local EPrints ID: 422628
URI: http://eprints.soton.ac.uk/id/eprint/422628
ISSN: 0014-4851
PURE UUID: 0dd82b59-b9fb-440e-a7d5-f3d961831967
ORCID for F. Pierron: ORCID iD orcid.org/0000-0003-2813-4994

Catalogue record

Date deposited: 26 Jul 2018 16:30
Last modified: 07 Oct 2020 06:40

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