Differential tomography of micromechanical evolution in elastic materials of unknown micro/macrostructure - Archive ouverte HAL Access content directly
Journal Articles SIAM Journal on Imaging Sciences Year : 2020

Differential tomography of micromechanical evolution in elastic materials of unknown micro/macrostructure

(1) , (2)
1
2

Abstract

Differential evolution indicators are introduced for 3D spatiotemporal imaging of micromechanical processes in complex materials where progressive variations due to manufacturing and/or aging are housed in a highly scattering background of a-priori unknown or uncertain structure. In this vein, a three-tier imaging platform is established where: (1) the domain is periodically (or continuously) subject to illumination and sensing in an arbitrary configuration; (2) sequential sets of measured data are deployed to distill segment-wise scattering signatures of the domain's internal structure through carefully constructed, non-iterative solutions to the scattering equation; and (3) the resulting solution sequence is then used to rigorously construct an imaging functional carrying appropriate invariance with respect to the unknown stationary components of the background e.g., pre-existing interstitial boundaries and bubbles. This gives birth to differential indicators that specifically recover the 3D support of micromechanical evolution within a network of unknown scatterers. The direct scattering problem is formulated in the frequency domain where the background is comprised of a random distribution of monolithic fragments. The constituents are connected via highly heterogeneous interfaces of unknown elasticity and dissipation which are subject to spatiotemporal evolution. The support of internal boundaries are sequentially illuminated by a set of incident waves and thusinduced scattered fields are captured over a generic observation surface. The performance of the proposed imaging indicator is illustrated through a set of numerical experiments for spatiotemporal reconstruction of progressive damage zones featuring randomly distributed cracks and bubbles.
Fichier principal
Vignette du fichier
DLSM.pdf (7.17 Mo) Télécharger le fichier
Origin : Files produced by the author(s)
Loading...

Dates and versions

hal-02416504 , version 1 (17-12-2019)

Identifiers

Cite

Fatemeh Pourahmadian, Houssem Haddar. Differential tomography of micromechanical evolution in elastic materials of unknown micro/macrostructure. SIAM Journal on Imaging Sciences, 2020, 13 (3), pp.1302-1330. ⟨10.1137/19M1305707⟩. ⟨hal-02416504⟩
73 View
59 Download

Altmetric

Share

Gmail Facebook Twitter LinkedIn More