Dr. Michael A. Sutton Keynote at the 2024 SEM Annual Conference
In this video, co-founder of Correlated Solutions, Dr. Michael A. Sutton gives a keynote presentation at the 2024 Society of Experimental Mechanics Annual Conference in Vancouver, WA. His talk entitled “Recent Developments: Direct Pointwise Comparison of FEA and StereoDIC Measurements” covers the recently published background research that led to the implementation of the integrated stress analysis feature in the latest version of the VIC-3D 10 digital image correlation system.
Myers T, Sutton MA, Schreier HW, Tofts A, Rajan-Kattil S. “Direct Pointwise Comparison of FE Predictions to StereoDIC Measurements: Developments and Validation Using Double Edge-Notched Tensile Specimen.” Computer Modeling in Engineering and Science.
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.