Berlin 2012 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 38: Focus: Rheology II (joint focus with DRG)

CPP 38.6: Vortrag

Freitag, 30. März 2012, 11:00–11:15, C 130

A sequence of physical processes determined and quantified in LAOS: A quantitative approach — •Simon Rogers — Forschungszentrum Jülich, Jülich, Germany

An entirely new way of analyzing linear and nonlinear oscillatory material responses is presented. The new quantitative sequence of physical processes (SPP) method is based on viewing generic nonlinear responses as sequences of 2D planes imbedded in a 3D space defined by the strain, strain-rate, and stress axes. Associated with each plane is a normal vector that wholly determines its orientation, which can be used to gain physically meaningful information by calculating the angles between a modified form of the normal vector and two reference vectors. Using this analysis technique, time-dependent phase and complex modulus, or dynamic modulus, information is obtainable throughout a period for arbitrary oscillatory responses. The new technique is applied to the Bingham plastic model, model power-law fluids, the Hershel-Bulkley model, and the nonlinear Giesekus model, to accustom the audience to its function.