Stéphane André ; Julien Boisse ; Camille Noûs - An FFT solver used for virtual Dynamic Mechanical Analysis experiments: Application to a glassy/amorphous system and to a particulate composite

jtcam:6450 - Journal of Theoretical, Computational and Applied Mechanics, April 16, 2021 - https://doi.org/10.46298/jtcam.6450
An FFT solver used for virtual Dynamic Mechanical Analysis experiments: Application to a glassy/amorphous system and to a particulate composite

Authors: Stéphane André ; Julien Boisse ; Camille Noûs

FFT-based solvers are increasingly used by many researcher groups interested in modelling the mechanical behavior associated to a heterogeneous microstructure. A development is reported here that concerns the viscoelastic behavior of composite structures generally studied experimentally through Dynamic Mechanical Analysis (DMA). A parallelized computation code developed with complex-valued quantities provides virtual DMA experiments directly in the frequency domain on a heterogeneous system described by a voxel grid of mechanical properties. The achieved precision and computation times are very good. An effort has been made to illustrate the application of such a virtual DMA tool through two examples from the literature: the modelling of glassy/amorphous systems at a small scale and the modelling of experimental data obtained in temperature sweeping mode by DMA on a particulate composite made of glass beads and a polystyrene matrix, at a larger scale. Both examples show how virtual DMA can contribute to question, analyze, and understand relaxation phenomena on either theoretical or experimental points of view.


Published on: April 16, 2021
Accepted on: February 5, 2021
Submitted on: May 6, 2020
Keywords: Dynamic Mechanical Analysis,FFT-solver,Viscoelasticity,Homogenization,Glassy polymers,Particle composites,[PHYS.MECA.MEMA]Physics [physics]/Mechanics [physics]/Mechanics of materials [physics.class-ph]


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