Influence of temperature on in-plane and out-of-plane mechanical behaviour of GFRP composite

Grubenmann, Michael; Heingärtner, Jörg; Hora, Pavel; Bassan, Daniele

doi:10.1088/1742-6596/1063/1/012146

Cited by 7 publications

(6 citation statements)

References 4 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…For numerical models using shell elements, the stiffness is unrealistically high, due to the fact that in classical approaches such as the Kirchhoff theory, the bending stiffness is given by the tensile stiffness and thickness while slippage between fibers leading to lower bending stiffness is not considered [11]. Therefore, the bending behaviour is adjusted through the position and number of integration points to the neutral axis of the sheet [12]. The friction between the individual contact pairs was investigated using a friction test setup.…”

Section: Numerical Modelmentioning

confidence: 99%

Surrogate model of the thermoforming of fiber reinforced thermoplastics

MIDDELHOFF

2023

Materials Research Proceedings

View full text Add to dashboard Cite

Abstract. In the thermoforming process shearing of fiber reinforced thermoplastics (FRTP) leads to wrinkle formation and is therefore one of the most critical deformation mechanism. The target value to predict wrinkle formation is the shear angle which is considered in this paper. To predict the shear angle distribution during the thermoforming of FRTPs a Convolutional Neural Network (CNN) is used. The approach is based on the consideration of the principal curvature characteristics, resulting in the reduction of any complex geometry to planar, parabolic, elliptical, semi-spherical and hyperbolic areas. In similar research, CNNs are trained for each specific geometry. In this work, the CNN refers to a database of the mentioned curvature characteristics. In theory, all forming geometries can be created from these, which is why the CNN is enabled to predict the forming result of any complex geometry. In this paper, the benchmark geometry of a double dome is selected as the validation geometry and the error in the prediction of the shear angle is compared with the results of numerical forming simulations performed.

show abstract

Section: Numerical Modelmentioning

confidence: 99%

Surrogate model of the thermoforming of fiber reinforced thermoplastics

MIDDELHOFF

2023

Materials Research Proceedings

View full text Add to dashboard Cite

show abstract

“…Figure 1). Grubenmann et al [13] modelled the laminate as a continuum using shell elements and two integration points (in the…”

Section: Approaches Of Modelling the Bending Behaviourmentioning

confidence: 99%

Comparison of modelling approaches for the bending behaviour of fibre‐reinforced thermoplastics in finite element forming analyses

Kabala,

Middelhoff,

Voigt

et al. 2023

Proc Appl Math and Mech

View full text Add to dashboard Cite

In the forming of thermoplastic composite laminates, the temperature‐dependent bending behaviour plays a significant role, in addition to in‐plane tension, in‐plane shear and ply/ply as well as tool/ply friction. The bending properties are decoupled from the in‐plane properties. Classical beam theories are therefore not valid for laminates, as they significantly overestimate the bending stiffness, especially in the molten state. Various approaches to modelling the bending behaviour have been presented in the literature, which can be used to model the out‐of‐plane properties for simulation. With these approaches, a parameter optimisation based on experimental deflection curves is performed through cantilever beam tests. A comparative analysis is then carried out to evaluate the suitability of a temperature and direction dependent modelling of the bending behaviour, the influence of the in‐plane properties and the computation time.

show abstract

“…The FE representative model of the experimental bending test was constructed as shown in Figure 8 showed a stiffer response in comparison to the experiment. The bending behaviour in the current study was identified by varying the position on the integration points in the FE model to match the experimental deformation test [20]. Integration rules are defined in natural coordinate system.…”

Section: Bending Test -Feamentioning

confidence: 99%

Experimental and numerical investigation on draping behaviour of woven carbon fabric

Balakrishnan

Yellur

Roesch

et al. 2021

Journal of Industrial Textiles

View full text Add to dashboard Cite

In the liquid composite moulding (LCM) process, fabric is draped over the mould surface and a resin is injected under pressure to develop a composite laminate. Wrinkling is one of the most common flaws that occurs during the draping of the fabric. Wrinkling of the fabric within the composite could severely reduce the quality of the finished composite laminate. Thus, to develop a high-quality composite laminate, exact prediction of fabric wrinkling behaviour is necessary. The aim of the paper is to investigate the draping behaviour of carbon fabric. Carbon fabric with an areal density of 245 g/m2 is used in the study. Both experimental and numerical investigations were performed. An experimental setup was developed to predict the draping behaviour of the carbon fabric used in the study. LS-DYNA/Explicit solver is used to achieve macro level draping simulation. Material model MAT_REINFORCED_THERMOPLASTIC [MAT_249] offers the possibility to simulate the forming behaviour of a thermoplastic material. To simulate dry fabrics using MAT_249, a very low properties are used for the matrix in the material model. To capture the forming behaviour of fabric, an intensive material characterization has been performed. Tensile and shear properties of the fabrics were determined using uniaxial and picture frame tests, respectively. Influence of the position of the integration points from the mid surface on bending behaviour is studied and calibrated using a simple test.

show abstract

Influence of temperature on in-plane and out-of-plane mechanical behaviour of GFRP composite

Cited by 7 publications

References 4 publications

Surrogate model of the thermoforming of fiber reinforced thermoplastics

Surrogate model of the thermoforming of fiber reinforced thermoplastics

Comparison of modelling approaches for the bending behaviour of fibre‐reinforced thermoplastics in finite element forming analyses

Experimental and numerical investigation on draping behaviour of woven carbon fabric

Contact Info

Product

Resources

About