Journal
INTERNATIONAL JOURNAL OF MATERIAL FORMING
Volume 3, Issue -, Pages S1253-S1266Publisher
SPRINGER FRANCE
DOI: 10.1007/s12289-009-0670-y
Keywords
Composite deformation; Bending deformation; Composite buckling; Composite viscosity; Viscous shear
Categories
Funding
- EPSRC
- Ministry of Defence
- University of Cambridge
- ESI Software
- Ford Motor Company Ltd.
- Granta Design Ltd
- Hexcel Composites
- MSC Software Ltd
- Polynorm Plastics (UK) Ltd
- Saint Gobain Vetrotex
- Engineering and Physical Sciences Research Council [GR/S67104/01] Funding Source: researchfish
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It is widely accepted that the key deformation mechanisms during forming of viscous textile composite (prepreg) sheets are in-plane shear and out-of-plane bending. This paper focuses on the bending deformation mechanism, including experimental characterisation and theoretical modelling of bending behaviour during viscous composite forming. Experimental measurements are obtained by means of a large-displacement buckling test at a variety of displacement rates and temperatures. Some important aspects, such as viscoelastic behaviour, are also investigated. A bending model based on elastic theory combined with uniaxial continuum theory for ideal fibre-reinforced fluids for viscous shear deformation has been developed, using material parameters obtained from industrial manufacturers as input data, such as composite geometry, fibre properties, fibre volume fraction and matrix rheology. Model predictions demonstrate that the model can capture the main characteristics of material properties, such as rate dependence. This bending model can be used in formability analysis for viscous unidirectional composite materials, and might be applied in a finite element forming simulation to account for the bending stiffness.
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