Abstract
Background Digital image correlation (DIC) is a widely used experimental method to measure full-field displacements and strains. This technique compares images of speckle patterns before and after deformation to computationally infer the displacement and strain fields. Of particular interest are complex mechanical phenomena where strains are far from uniform.
Objective In such situations, it would be desirable to use an adaptive technique with higher resolution in the regions of rapidly changing strain and lower resolution elsewhere.
Methods This paper builds on the recently proposed augmented Lagrangian digital image correlation (ALDIC) method to incorporate mesh adaptivity. We call the resulting approach adapt-ALDIC.
Results We show that the structure of ALDIC makes it easy to incorporate adaptive resolution. We demonstrate through both synthetic and experimental examples that adapt-ALDIC is robust and saves significant computational time with almost no loss in accuracy. Among two types of adaptive mesh strategies, we find that adaptive quadtree mesh outperforms Kuhn triangulation mesh both in accuracy and computational cost. Indeed, we demonstrate that quadtree adapt-ALDIC provides compatible deformation and noise insensitivity typical of global DIC at the cost of local DIC.
Conclusions Adapt-ALDIC with adaptive quadtree mesh can analyze heterogeneous deformations accurately and efficiently. An open-source Matlab code is freely available through GitHub and Caltech DATA.
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Notes
We only consider FE-based global DIC in this work. It is also possible to have other basis sets for global DIC, and other approaches like dense global DIC. We do not consider them here.
The introduction of the regularizer requires a boundary condition, and one can proceed analogously with displacement boundary conditions if the boundary displacements are known.
In our previous work on ALDIC [25], we used finite difference discretization where the gradients are defined on the nodes.
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Acknowledgements
We are grateful to Prof. Jacob Notbohm and Aashrith Saraswathibhatla who shared their experimental data with us. We gratefully acknowledge the support of the US Air Force Office of Scientific Research through the MURI grant ‘Managing the Mosaic of Microstructure’ (FA9550-12-1-0458).
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Yang, J., Bhattacharya, K. Fast Adaptive Mesh Augmented Lagrangian Digital Image Correlation. Exp Mech 61, 719–735 (2021). https://doi.org/10.1007/s11340-021-00695-9
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DOI: https://doi.org/10.1007/s11340-021-00695-9