ABSTRACT
This study proposes a method to characterize constitutive behavior and properties of materials by integrating non-linear optimization of local displacement data from DIC (digital image correlation) and finite element modeling (FEM). Toward that end, the Neader-Mead algorithm was used to minimize an objective function constructed from multiple discrete points from DIC and FEM simulation. The developed method was then used to determine constitutive properties of LE (linear elastic) and LVE (linear viscoelastic) materials. Polyetheretherketone (PEEK) and fine aggregate matrix (FAM) were selected for the LE and LVE investigations, respectively. The DIC-FEM method herein can converge to optimal solution in less than 60 iterations for both LE and LVE materials. The integrated DIC-FEM method can vastly improve testing efficiency by reducing the number of replicates and also provide a better understanding of localized behavior of materials such as cracking and damage, in particular of inelastic heterogeneous materials and composites such as asphaltic materials.
