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Finite element formulation for a digital image correlation method
Yaofeng Sun1, John H L Pang, Chee Khuen Wong
1School of Mechanical and Aerospace Engineering, Nanyang Technological University, Singapore 639798. sunyaofeng@gmail.com
Applied Optics
|December 16, 2005
Summary
A novel finite element formulation for digital image correlation directly determines 2D displacement fields. This accurate and efficient method ensures displacement continuity across images.
Area of Science:
- * Computational mechanics
- * Experimental mechanics
- * Digital image analysis
Background:
- * Digital Image Correlation (DIC) is a widely used non-contact optical method for measuring deformation.
- * Traditional subset-based DIC methods often struggle with ensuring displacement continuity and derivative continuity.
- * These limitations can affect the accuracy and robustness of strain and displacement field calculations.
Purpose of the Study:
- * To present a finite element formulation for digital image correlation (DIC).
- * To enable direct determination of the complete two-dimensional displacement field.
- * To overcome limitations of traditional subset-based DIC methods.
Main Methods:
- * Discretization of the entire image area into finite elements.
- * Application of algorithms for image correlation within the finite element framework.
- * Verification through numerical simulations and a physical experiment.
Main Results:
- * The proposed finite element formulation ensures displacement and derivative continuity among image elements.
- * Numerical studies and experimental validation confirm the method's effectiveness.
- * The approach demonstrates computational efficiency, high accuracy, and robustness.
Conclusions:
- * The finite element formulation offers a significant advancement for DIC methods.
- * It provides a more rigorous and reliable way to determine displacement fields.
- * This method enhances the accuracy and applicability of DIC in various scientific and engineering fields.
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