Open Access

ARTICLE

Direct Pointwise Comparison of FE Predictions to StereoDIC Measurements: Developments and Validation Using Double Edge-Notched Tensile Specimen

by Troy Myers¹, Michael A. Sutton^1,*, Hubert Schreier², Alistair Tofts², Sreehari Rajan Kattil¹

1 Department of Mechanical Engineering, University of South Carolina, Columbia, SC, 29208, USA
2 Correlated Solutions Incorporated, 121 Dutchman Blvd, Columbia, SC, 29063, USA

* Corresponding Author: Michael A. Sutton. Email:

Computer Modeling in Engineering & Sciences 2024, 140(2), 1263-1298. https://doi.org/10.32604/cmes.2024.048743

Received 17 December 2023; Accepted 12 March 2024; Issue published 20 May 2024

Abstract

To compare finite element analysis (FEA) predictions and stereovision digital image correlation (StereoDIC) strain measurements at the same spatial positions throughout a region of interest, a field comparison procedure is developed. The procedure includes (a) conversion of the finite element data into a triangular mesh, (b) selection of a common coordinate system, (c) determination of the rigid body transformation to place both measurements and FEA data in the same system and (d) interpolation of the FEA nodal information to the same spatial locations as the StereoDIC measurements using barycentric coordinates. For an aluminum Al-6061 double edge notched tensile specimen, FEA results are obtained using both the von Mises isotropic yield criterion and Hill’s quadratic anisotropic yield criterion, with the unknown Hill model parameters determined using full-field specimen strain measurements for the nominally plane stress specimen. Using Hill’s quadratic anisotropic yield criterion, the point-by-point comparison of experimentally based full-field strains and stresses to finite element predictions are shown to be in excellent agreement, confirming the effectiveness of the field comparison process.

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