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Experimental study and numerical modelling of squeeze flow in laminate viscous discontinuous composites

Abstract : The design freedom of composites can be improved by combining continuous and discontinuous prepregs. The forming of a pre-heated blank made of optimally oriented and distributed discontinuous prepreg plies may lead to unacceptable defects such as in-plane and out-of-plane wrinkles, sliding of plies, rotation of adjacent plies, bending of fibres induced by transverse squeeze flow and finally to inappropriate and inefficient fibre distribution. This arises because the individual discontinuous plies are free to move and deform in the mould during the forming step. First, this work presents some experiments conducted to identify the behaviour of a stack of unidirectional and woven discontinuous viscous prepregs subjected to through-thickness compression. Then a model based on a heterogeneous transverse isotropic fluid approach is gradually developped in agreement with the experimental findings. It is shown that the various observed phenomena are retrieved for the unidirectional and partly for the woven prepreg by the numerical model. The predicted values are in good agreement with measurements, when the problem is solved in 3D with a relatively fine mesh in the thickness. Finally an attempt is made to reduce the computational cost by the use of advanced numerical simulation techniques.
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Submitted on : Wednesday, October 28, 2020 - 11:07:11 AM
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  • HAL Id : tel-02981706, version 1

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Grégoire Sorba. Experimental study and numerical modelling of squeeze flow in laminate viscous discontinuous composites. Fluids mechanics [physics.class-ph]. École centrale de Nantes, 2017. English. ⟨NNT : 2017ECDN0038⟩. ⟨tel-02981706⟩

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