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Materials (Basel). 2019 Jun 12;12(12). pii: E1885. doi: 10.3390/ma12121885.

A Multiscale Modelling Approach for Estimating the Effect of Defects in Unidirectional Carbon Fiber Reinforced Polymer Composites.

Author information

1
Department of Mechanical Engineering, Aalto University, Puumiehenkuja 3, 02150 Espoo, Finland. kim-niklas.antin@aalto.fi.
2
VTT Technical Research Centre of Finland, Kivimiehentie 3, 02044 VTT, Finland. anssi.laukkanen@vtt.fi.
3
VTT Technical Research Centre of Finland, Kivimiehentie 3, 02044 VTT, Finland. tom.andersson@vtt.fi.
4
Department of Civil and Structural Engineering, University of Sheffield, Mappin Street, Sheffield S13JD, UK. d.smyl@sheffield.ac.uk.
5
Department of Mechanical Engineering, Aalto University, Puumiehenkuja 3, 02150 Espoo, Finland. pedro.vilaca@aalto.fi.

Abstract

A multiscale modelling approach was developed in order to estimate the effect of defects on the strength of unidirectional carbon fiber composites. The work encompasses a micromechanics approach, where the known reinforcement and matrix properties are experimentally verified and a 3D finite element model is meshed directly from micrographs. Boundary conditions for loading the micromechanical model are derived from macroscale finite element simulations of the component in question. Using a microscale model based on the actual microstructure, material parameters and load case allows realistic estimation of the effect of a defect. The modelling approach was tested with a unidirectional carbon fiber composite beam, from which the micromechanical model was created and experimentally validated. The effect of porosity was simulated using a resin-rich area in the microstructure and the results were compared to experimental work on samples containing pores.

KEYWORDS:

carbon fiber composite; defect; experimental mechanics; modelling; multiscale

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