Session Details
MS01-1: 3D Imaging and Segmentation Methods for Computational Modeling of Heterogeneous Materials (Ganzes Minisymposium anzeigen)
Wednesday, 11. October 2017; 10:30 - 12:30 Uhr in Raum 7.12
Sitzungsleitung: Pietro Carrara
10:30
Modelling of microcracking in image-based models of highly heterogeneous materials using the phase field method (Keynote)
Julien Yvonnet (Université Paris-Est), Than Tung Nguyen (Université Paris-Est), Michel Bornert (Ecole des Ponts ParisTech), Camille Chateau (Ecole des Ponts ParisTech), Liang Xia (Université Paris-Est)
Kurzfassung:
Crack nucleation and propagation in heterogeneous materials models, as obtained by X-Ray micro-CT imagery, is investigated by the phase field method. Several 3D analyses in highly heterogeneous materials are carried out, with application to cementitious materials. Direct comparisons of complex 3D micro cracking in heterogeneous quasi-brittle materials modeled by the phase field numerical method and observed by imaging during in situ mechanical testing are presented.
Modelling of microcracking in image-based models of highly heterogeneous materials using the phase field method (Keynote)
Julien Yvonnet (Université Paris-Est), Than Tung Nguyen (Université Paris-Est), Michel Bornert (Ecole des Ponts ParisTech), Camille Chateau (Ecole des Ponts ParisTech), Liang Xia (Université Paris-Est)
Kurzfassung:
Crack nucleation and propagation in heterogeneous materials models, as obtained by X-Ray micro-CT imagery, is investigated by the phase field method. Several 3D analyses in highly heterogeneous materials are carried out, with application to cementitious materials. Direct comparisons of complex 3D micro cracking in heterogeneous quasi-brittle materials modeled by the phase field numerical method and observed by imaging during in situ mechanical testing are presented.
11:10
Numerical validation framework for micromechanical simulations based on 3D imaging
Francois Hild (The National Center for Scientific Research, University Paris-Saclay), Group Cominside (Ecoles des Mines de Paris)
Kurzfassung:
A computational framework is introduced to validate simulations at the microscale. A specimen made of cast iron is imaged via synchrotron laminography during a tensile test. The region of interest is analyzed by Digital Volume Correlation (DVC) to measure kinematic fields. Finite Element simulations, which account for the studied material microstructure, are driven by Dirichlet boundary conditions extracted from DVC measurements. Gray level residuals are assessed for validation purposes.
Numerical validation framework for micromechanical simulations based on 3D imaging
Francois Hild (The National Center for Scientific Research, University Paris-Saclay), Group Cominside (Ecoles des Mines de Paris)
Kurzfassung:
A computational framework is introduced to validate simulations at the microscale. A specimen made of cast iron is imaged via synchrotron laminography during a tensile test. The region of interest is analyzed by Digital Volume Correlation (DVC) to measure kinematic fields. Finite Element simulations, which account for the studied material microstructure, are driven by Dirichlet boundary conditions extracted from DVC measurements. Gray level residuals are assessed for validation purposes.
11:30
Diffraction and Attenuation X-ray Imaging of Ductile Damage Combine with Crystal Plasticity Finite Element Modelling
Christophe Le Bourlot (INSA LYON), Sylvain Dancette (INSA LYON), Eric Maire (INSA LYON), Wolfgang Ludwig (INSA LYON)
Kurzfassung:
Recent techniques of 3D synchrotron imaging allow to fill the gap between several fields of experimental damage mechanics. The present work combines local crystallographic characterisation and the related plasticity mechanisms to observations and quantitative measurements of the three stages of ductile fracture, applied on aluminium. Phase and diffraction contrast tomography are used as input for modelling to better understand the local stress and deformation state governing damage.
Diffraction and Attenuation X-ray Imaging of Ductile Damage Combine with Crystal Plasticity Finite Element Modelling
Christophe Le Bourlot (INSA LYON), Sylvain Dancette (INSA LYON), Eric Maire (INSA LYON), Wolfgang Ludwig (INSA LYON)
Kurzfassung:
Recent techniques of 3D synchrotron imaging allow to fill the gap between several fields of experimental damage mechanics. The present work combines local crystallographic characterisation and the related plasticity mechanisms to observations and quantitative measurements of the three stages of ductile fracture, applied on aluminium. Phase and diffraction contrast tomography are used as input for modelling to better understand the local stress and deformation state governing damage.
11:50
2D-Surface and 3D-Volume Digital Image Correlation (DIC) for materials characterization at different scales
Roberto Fedele (Politecnico di Milano)
Kurzfassung:
Mechanical response of advanced materials and structures at different scales can be effectively assessed through Digital Image Correlation (DIC) procedures. Displacement fields can be measured over the flat surface of samples or even within the bulk at different instants during non-conventional experiments, and used as highly qualified information for finite element modelling and for the subsequent calibration/validation stages.
2D-Surface and 3D-Volume Digital Image Correlation (DIC) for materials characterization at different scales
Roberto Fedele (Politecnico di Milano)
Kurzfassung:
Mechanical response of advanced materials and structures at different scales can be effectively assessed through Digital Image Correlation (DIC) procedures. Displacement fields can be measured over the flat surface of samples or even within the bulk at different instants during non-conventional experiments, and used as highly qualified information for finite element modelling and for the subsequent calibration/validation stages.