TY  - EJOU
AU  - Myers, Troy 
AU  - Sutton, Michael A. 
AU  - Schreier, Hubert 
AU  - Tofts, Alistair 
AU  - Kattil, Sreehari Rajan 

TI  - Direct Pointwise Comparison of FE Predictions to StereoDIC Measurements: Developments and Validation Using Double Edge-Notched Tensile Specimen
T2  - Computer Modeling in Engineering \& Sciences

PY  - 2024
VL  - 140
IS  - 2
SN  - 1526-1506

AB  - To compare finite element analysis (FEA) predictions and stereovision digital image correlation (StereoDIC) strain measurements <i>at the same spatial positions</i> 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.
KW  - StereoDIC; spatial co-registration; data transformation; finite element simulations; point-wise comparison of measurements and FEA predictions; double edge notch specimen; model validation

DO  - 10.32604/cmes.2024.048743