Sensitivity-based virtual fields for the non-linear virtual fields method
- Resource Type
- Original Paper
- Authors
- Marek, Aleksander; Davis, Frances M.; Pierron, Fabrice
- Source
- Computational Mechanics: Solids, Fluids, Structures, Fluid-Structure Interactions, Biomechanics, Micromechanics, Multiscale Mechanics, Materials, Constitutive Modeling, Nonlinear Mechanics, Aerodynamics. :1-23
- Subject
- Virtual fields method
Sensitivity-based virtual fields
Inverse identification
Full field measurement
Elasto-plastic
Digital image correlation
- Language
- English
- ISSN
- 0178-7675
1432-0924
The virtual fields method is an approach to inversely identify material parameters using full-field deformation data. In this manuscript, a new set of automatically-defined virtual fields for non-linear constitutive models has been proposed. These new sensitivity-based virtual fields reduce the influence of noise on the parameter identification. The sensitivity-based virtual fields were applied to a numerical example involving small strain plasticity; however, the general formulation derived for these virtual fields is applicable to any non-linear constitutive model. To quantify the improvement offered by these new virtual fields, they were compared with stiffness-based and manually defined virtual fields. The proposed sensitivity-based virtual fields were consistently able to identify plastic model parameters and outperform the stiffness-based and manually defined virtual fields when the data was corrupted by noise.