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FFT-based solvers are increasingly used by many researcher groups interestedin modelling the mechanical behavior associated to a heterogeneousmicrostructure. A development is reported here that concerns the viscoelasticbehavior of composite structures generally studied experimentally throughDynamic Mechanical Analysis (DMA). A parallelized computation code developedunder complex-valued quantities provides virtual DMA experiments directly inthe frequency domain on a heterogenous system described by a voxel grid ofmechanical properties. The achieved precision and computation times are verygood. An effort has been made to show the application of such virtual DMA toolstarting from two examples found in the literature: the modelling ofglassy/amorphous systems at a small scale and the modelling of experimentaldata obtained in temperature sweeping mode by DMA on a particulate compositemade of glass beads and a polystyrene matrix, at a larger scale. Both examplesshow how virtual DMA can contribute to question, analyze, understand relaxationphenomena either on the theoretical or experimental point of view.

An FFT-solver used for virtual Dynamic Mechanical Analysis experiments: Application on a glassy/amorphous system and on a particulate composite