Analysis of flexible bending behavior of woven preform using non-orthogonal constitutive equation

Yu, Wai; Zampaloni, Michael A.; Pourboghrat, Farhang; Chung, Kwansoo; Kang, Tae Jin

doi:10.1016/j.compositesa.2004.10.026

Cited by 61 publications

(31 citation statements)

References 11 publications

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“…There are not many research works about bending behaviour of reinforcements, excepting Yu et al [24] and Lomov et al [33]. On the contrary, there are a lot of studies in the field of clothing [34].…”

Section: CMmentioning

confidence: 97%

“…But Yu et al [24] investigated the bending behaviour of a woven preform through a cantilever experiment and simulation where the deflection was only due to gravity. The authors showed the discrepancy between the experimental and numerical results and concluded that bending rigidity derived from in-plane properties gives unrealistically high value compared to the experimental bending rigidity of the woven preform.…”

Section: Bending Propertiesmentioning

confidence: 99%

“…Moreover, it has been shown that bending properties cannot be deduced from in-plane properties, like continuous material [24]. Reinforcement bending behaviour is a specific structural out of plane behaviour.…”

Section: Introductionmentioning

confidence: 99%

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Experimental Study of Bending Behaviour of Reinforcements

et al. 2009

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In composite reinforcement shaping, textile preform undergo biaxial tensile deformation, in plane shear deformation, transverse compaction and outof-plane bending deformations. Bending deformations have been neglected in some simulation codes up to now, but taking into account them would give more accurate simulations of forming especially for stiff and thick textiles. Bending behaviour is specific because the reinforcements are structural parts and out of plane properties cannot be directly deduced from in-plane properties, like for continuous material. Because the standard tests are not adapted for stiff reinforcements with non linear behaviour a new flexometer using optical measurements has been developed to test such reinforcements. This new device enables to carry out a set of cantilever tests with different histories of load. A series of tests has been performed to validate the test method and to show the capacities of the new flexometer to identify non linear non elastic behaviour.

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Section: CMmentioning

confidence: 97%

Section: Bending Propertiesmentioning

confidence: 99%

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Experimental Study of Bending Behaviour of Reinforcements

et al. 2009

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“…Some approaches were used to account for the bending behaviour in finite element (FE) simulations, such as constant flexural rigidity (with no rate and temperature dependence) by Cartwright et al [40] and an asymmetric axial modulus for the bending rigidity by Yu et al [41].…”

Section: Implementation In Forming Simulationsmentioning

confidence: 99%

Experimental measurement and predictive modelling of bending behaviour for viscous unidirectional composite materials

2009

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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 fibrereinforced 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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“…This is not the case for composite reinforcements because they are structural heterogeneous materials. Bending behaviour is then a structural multi-scale specific problem which cannot be directly deduced from the in-plane material properties [7]. Because standard bending test devices devoted for clothing textiles are not adequate, a new cantilever test has been developed to test stiff and thick reinforcements [8].…”

Section: Introductionmentioning

confidence: 99%

Study of bending behaviour of composite reinforcements

et al. 2009

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In shaping of composite reinforcements, tensile stresses are the major stresses, while in plane shear strains are the major strains. However the knowledge of the bending behaviour would give more precisely simulation of forming especially for stiffer and thicker textiles. A new cantilever test using optical measurement has been developed to identify non elastic behaviour by taking into account the history of the strains. Associated to the test, an inverse identification method has been developed. Based on the simulation of the test using finite element analysis, the method enables to test the validity of a postulated bending model and to optimize the values of its parameters if validated. An hysteretic bending model has been tested for a carbon Non Crimp Fabric reinforcement to show the advantage of the complete approach.

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Analysis of flexible bending behavior of woven preform using non-orthogonal constitutive equation

Cited by 61 publications

References 11 publications

Experimental Study of Bending Behaviour of Reinforcements

Experimental Study of Bending Behaviour of Reinforcements

Experimental measurement and predictive modelling of bending behaviour for viscous unidirectional composite materials

Study of bending behaviour of composite reinforcements

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