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Image-based stress field reconstruction in complex media

Image-based stress field reconstruction in complex media
Image-based stress field reconstruction in complex media

In many instances in life, materials are subject to deformation at high rates, for example: impact, crash, metal forming or pulsed welding. In this context, the transient and inhomogeneous nature of such loading as well as the strong multi-physic couplings induced by quasi-adiabatic conditions make: the experimental capture of the mechanical response very challenging. Additionally, assumptions regarding the constitutive relation of the deforming material are generally required. To overcome both issues, we demonstrate that experimental full-field measurements of acceleration fields can be directly used to invert the local equilibrium equation and reconstruct fields of the stress tensor with no assumption on the constitutive relation and its spatial and temporal variations. We also demonstrate that both experimental stress and strain fields can be recombined to eventually identify the local tangent stiffness tensor of the material. This study constitutes a first step in the field of “direct model identification”, as opposed to standard parametric model identification.

Dynamic, Mechanical behaviour, Model identification, Stress, Ultra-high speed imaging
101-104
Springer
Seghir, R.
cd6555fb-7c90-46e2-b16a-1a6f0a666e59
Pierron, F.
a1fb4a70-6f34-4625-bc23-fcb6996b79b4
Fletcher, L.
48dca64b-f93c-4655-9205-eaf4e74be90c
Dulieu-Barton, Janice M.
Quinn, Simon
Bossuyt, Sven
Baldi, Antonio
Balandraud, Xavier
Seghir, R.
cd6555fb-7c90-46e2-b16a-1a6f0a666e59
Pierron, F.
a1fb4a70-6f34-4625-bc23-fcb6996b79b4
Fletcher, L.
48dca64b-f93c-4655-9205-eaf4e74be90c
Dulieu-Barton, Janice M.
Quinn, Simon
Bossuyt, Sven
Baldi, Antonio
Balandraud, Xavier

Seghir, R., Pierron, F. and Fletcher, L. (2019) Image-based stress field reconstruction in complex media. Dulieu-Barton, Janice M., Quinn, Simon, Bossuyt, Sven, Baldi, Antonio and Balandraud, Xavier (eds.) In Residual Stress, Thermomechanics and Infrared Imaging, Hybrid Techniques and Inverse Problems - Proceedings of the 2018 Annual Conference on Experimental and Applied Mechanics. vol. 7, Springer. pp. 101-104 . (doi:10.1007/978-3-319-95074-7_19).

Record type: Conference or Workshop Item (Paper)

Abstract

In many instances in life, materials are subject to deformation at high rates, for example: impact, crash, metal forming or pulsed welding. In this context, the transient and inhomogeneous nature of such loading as well as the strong multi-physic couplings induced by quasi-adiabatic conditions make: the experimental capture of the mechanical response very challenging. Additionally, assumptions regarding the constitutive relation of the deforming material are generally required. To overcome both issues, we demonstrate that experimental full-field measurements of acceleration fields can be directly used to invert the local equilibrium equation and reconstruct fields of the stress tensor with no assumption on the constitutive relation and its spatial and temporal variations. We also demonstrate that both experimental stress and strain fields can be recombined to eventually identify the local tangent stiffness tensor of the material. This study constitutes a first step in the field of “direct model identification”, as opposed to standard parametric model identification.

Full text not available from this repository.

More information

e-pub ahead of print date: 10 October 2019
Venue - Dates: SEM Annual Conference and Exposition on Experimental and Applied Mechanics, 2018, Greenville, United States, 2018-06-04 - 2018-06-07
Keywords: Dynamic, Mechanical behaviour, Model identification, Stress, Ultra-high speed imaging

Identifiers

Local EPrints ID: 431267
URI: https://eprints.soton.ac.uk/id/eprint/431267
PURE UUID: 90eecc08-8560-4da1-a2e4-00132118bf87
ORCID for F. Pierron: ORCID iD orcid.org/0000-0003-2813-4994

Catalogue record

Date deposited: 29 May 2019 16:30
Last modified: 20 Jul 2019 00:47

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