Hypo-viscoelastic modelling of in-plane shear in UD thermoset prepregs

Wang, Yi; Belnoue, Jonathan P.-H.; Hallett, Stephen R

doi:10.1016/j.compositesa.2021.106400

Cited by 14 publications

(3 citation statements)

References 38 publications

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“…This model is implemented through a user material subroutine based on a simplification of the work of Wang et al (Wang et al, 2021) using the Kelvin-Voigt model (Larberg and Åkermo 2014), the overall stress being the sum of the contributions from the two elements.…”

Section: Model Descriptionmentioning

confidence: 99%

“…This relation is a significant simplification of the actual behaviour of the impregnated fabric, which is known to be more complicated for materials such as prepregs (Wang et al, 2021). However, this exercise investigates the conceptual feasibility of extracting viscous patch properties from a BET.…”

Section: Model Descriptionmentioning

confidence: 99%

“…(1) The dash-pot model (Wang et al, 2021) may not be fully applicable. This is a very rough approximation as it treats the patches as a fully viscous material and does not consider the patch to have any resistance at infinitesimally small strain rates.…”

Section: Visco-elastic Model and Resin Film Experimentsmentioning

confidence: 99%

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A New Approach to Measuring Local Properties of Preforms Enhanced for Formability

et al. 2022

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Forming of dry engineering textiles is a quality-critical operation in composites manufacturing. There are various different defect mitigation strategies that have been developed to ensure that material will not wrinkle or fold when depositing and forming. One promising direction is the modification of textile properties in the regions where a defect is likely to form. This can be achieved by the integration of patches: additional materials, such as reactive thermally-conditioned resins, tufted or stitched yarns, thermoplastic films, locally activated binder, etc. This method is simple and effective for a certain class of forming problems. The success of the forming operation depends on the balance of properties between dry and patched materials. At present, there is no clearly established methodology for the characterisation of these formability enhancements. Patches are local and an isolated coupon often cannot be extracted from a hosting fabric. This paper discusses the feasibility of adapting the conventional bias extension test to extract the shear properties of locally enhanced material. The obtained properties are critical for modelling tools that can inform the optimum patch location and orientation. The suggested approach is practical, simple to implement and proven to provide properties to a reasonable degree of accuracy for non-linear elastic and visco-elastic patch behaviours.

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Section: Model Descriptionmentioning

confidence: 99%

Section: Model Descriptionmentioning

confidence: 99%

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A New Approach to Measuring Local Properties of Preforms Enhanced for Formability

et al. 2022

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Spring‐back of Al/CF/PEEK parts during one‐step hot stamping forming using a CAE chain considering all process steps

Lu,

Li,

Liu

et al. 2024

Polymer Composites

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Spring‐back is a forming defect in thermoplastic fiber‐metal‐laminate (FML) structures that is influenced by all steps of the forming process. Here, we propose a complete CAE chain to predict spring‐back in a FML parts during one‐step hot stamping by fully considering the material properties, latent heat, thermal mismatch, and modulus mismatch during forming and cooling. Then, constitutive models of the aluminum sheet, a visco‐hyperelastic constitutive model, and an elastic model of the UD CF/PEEK prepregs during hot‐stamping and cooling are introduced to describe the deformation behavior. A Coulombic friction model, latent heat model, and contact resistance model are also proposed to describe the interfacial flow, heat generation, and thermal conductivity. The proposed models and CAE chain are validated by the experimentally determined punching force, geometric shape, temperature, and spring‐back angle. The S‐shaped feature of the FML greatly increases the spring‐back of the FML specimens, and lower punching speeds and higher forming temperatures decreases the S‐shaped feature, thereby reducing the spring‐back angle.Highlights A complete CAE chain was proposed to predict spring‐back in a FML curved beam. A new visco‐hyperelastic constitutive model of the CF/PEEK was applied. The latent heat and thermal mismatch were considered in cooling simulation. The S‐shaped feature of the FML greatly increases the spring‐back. The thermal mismatch increased the S‐shaped feature of the FML.

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On the need to better control tooling in prepreg Automated Fibre Placement (AFP) deposition

Wang,

Timofte,

Mahapatra

et al. 2024

Composites Communications

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Hypo-viscoelastic modelling of in-plane shear in UD thermoset prepregs

Cited by 14 publications

References 38 publications

A New Approach to Measuring Local Properties of Preforms Enhanced for Formability

A New Approach to Measuring Local Properties of Preforms Enhanced for Formability

Spring‐back of Al/CF/PEEK parts during one‐step hot stamping forming using a CAE chain considering all process steps

On the need to better control tooling in prepreg Automated Fibre Placement (AFP) deposition

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