Summary
Carbon fibre composite prepreg materials are essentially heterogeneous structures and moulding them results in unstable deformation. The flow state during a press forming process can be analysed by representing the material flow as being unsteady.
For an unstable condition, a Lagrangean description should be applied, but to simplify the analysis a progressive step-by-step formulation method is developed using an Eulerian description.
By minimising energy, the eigenvalue and linear incremental analyses can be applied to predict the progress of flow for the initial condition. The numerical results reveal the initiation of the weld line which can lead to fracture of the composite structure. An additional outcome of the work is the development of a hybrid moulding method, which avoids this trouble by employing laminates composed of materials of different stiffness.
The progressive flow of a composite during moulding has been analysed numerically by assuming the flow to be anisotropic. The numerical results obtained here by the progressive step-by-step method are shown to be in good agreement with experiments. The rheological method should also be effective for dealing with carbon fibre composite prepreg materials.
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© 1986 Elsevier Applied Science Publishers Ltd
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Hirai, T. (1986). Rheology of Carbon Fibre Composite Prepreg Materials. In: Pritchard, G. (eds) Developments in Reinforced Plastics—5. Springer, Dordrecht. https://doi.org/10.1007/978-94-009-4179-3_8
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DOI: https://doi.org/10.1007/978-94-009-4179-3_8
Publisher Name: Springer, Dordrecht
Print ISBN: 978-94-010-8356-0
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