1. An FFT solver used for virtual Dynamic Mechanical Analysis experiments: Application to a glassy/amorphous system and to a particulate composite
- Author
-
Stéphane André, Julien Boisse, and Camille Noûs
- Subjects
dynamic mechanical analysis ,fft-solver ,viscoelasticity ,homogenization ,glassy polymers ,particle composites ,[phys.meca.mema]physics [physics]/mechanics [physics]/mechanics of materials [physics.class-ph] ,Mechanics of engineering. Applied mechanics ,TA349-359 - Abstract
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
- 2021
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