Effective viscoelastic behavior of short fibers composites using virtual DMA experiments

Abstract

May it be for environmental or economic reasons, mass reduction has become one of the main goals of mechanical conceptions. Short fiber Thermoplastics composites is an interesting possibility since they present a good compromise between relatively easy process and mechanical properties. The aim of this work is to estimate and model the viscoelastic behavior at small strain of PC Lexan/Glass fiber composites.To meet this goal, a full field homogenization method based on solving the boundary problem through FFT is used. Virtual DMA experiments are used to build the master curve of the composite. They are later used to identify a macroscopic model for transverse isotropic short fiber composites. Finally, a meta-model is built to estimate the behavior of the composite at any given fiber volume ratio.

A review of nonlinear FFT-based computational homogenization methods

“…Woven [229] and non-woven [257,258] materials as well as braided composites [230,231] were considered. For short fiber composites, studies included their viscoelastic behavior [259,260], a comparison to in situ microtensile experiments [261] and an optimal experimental design [262]. Furthermore, SiC/SiC composites [158,228], ceramic matrix composites (CMCs) [241], metal matrix composites (MMCs) [263], carbon nanoparticle reinforced composites [264], sheet molding compound (SMC) composites [265] and filled rubbers [266,267] were studied via FFT-based computational homogenization methods.…”

A new method of grafting multi-walled carbon nanotubes on carbon fibers for improving the mechanical and thermal properties of woven fabric composites

“…DMA can characterize the viscoelastic properties of materials and could be used to determine storage modulus (E 0 ), loss modulus (E 00 ) and loss factor (tand) of carbon fabric/PP composites. [15][16][17] A single cantilever bending pattern of DMA was carried out by using DMA850/Q850 equipment with a heating rate of 3 C/min from -70 to 70 C. The amplitude and frequency of the tests were 20.0 lm and 1.0 Hz, respectively.…”

Effective thermo-viscoelastic behavior of short fiber reinforced thermo-rheologically simple polymers: An application to high temperature fiber reinforced additive manufacturing

“…It is necessary to choose a homogenization method to describe the effective behavior of the fiber-reinforced filament, (see for instance [43]). The macroscopic behavior can be given as a result of numerical simulations in the case of full-field methods (see for instance [44,45,17,9,8]). In case of complex microstructures, the estimates given by the mean field methods are no longer accurate and require numerical calculations to be approximated (see [42] and [54] in the case of poly-crystals).…”