Isogeometric analysis for strain field measurements
Résumé
In this paper, the potential of Isogeometric Analysis for strain field measurement by Digital Image Correla- tion is investigated. Digital Image Correlation (DIC) is a full field kinematics measurement technique based on gray level conservation principle and the formulation we adopt allows for using arbitrary displacement bases. The high continuity properties of Non-Uniform Rational B-Spline (NURBS) functions are exploited herein as an additional regularization of the initial ill-posed problem. k-refinement is analyzed on an artificial test case where the proposed methodology is shown to outperform usual finite element based DIC. Finally a fatigue tensile test on a thin aluminum sheet is analyzed. Strain localization occurs after a certain number of cycles and combination of NURBS into a DIC algorithm clearly shows a great potential to improve the robustness of non-linear constitutive law identification.
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