Speaker: Ewoldt, Randy H (IMA)
Title: New measures for characterizing nonlinear viscoelastic materials using large amplitude oscillatory shear (LAOS) deformation
Abstract: Viscoelastic materials, such as biomaterials and non-Newtonian fluids, typically experience mechanical loading which evokes a nonlinear rheological response. Rheologically complex materials can provide novel functionality in biological and engineered systems. However, traditional characterization techniques are insufficient to appropriately describe nonlinear viscoelasticity. I will outline new measures which can be used to meaningfully describe the viscoelastic response of materials subjected to large amplitude oscillatory shear (LAOS) deformation. The new framework makes use of orthogonal Chebyshev polynomials and an appropriate choice of coordinate system in which to represent the data. The framework has been packaged into a distributable data analysis program to widen its use in both academic and industrial settings.