Investigation of the effect of wrinkle features on wind turbine blade sub-structure strength

Bender, J. J.; Hallett, Stephen R; Lindgaard, Esben

doi:10.1016/j.compstruct.2019.03.026

Cited by 30 publications

(17 citation statements)

References 21 publications

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“…All presented results from wrinkled sub-structures in the parametric study are numerical. A thorough comparison of numerical and experimental results for wrinkled sub-structures are presented in [13] None of the studied parameters are by themselves enough to determine the knock-down caused by the wrinkle. The average wrinkle angle can thus not be used on its own to determine the knock-down.…”

Section: Discussionmentioning

confidence: 99%

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Parametric study of the effect of wrinkle features on the strength of a tapered wind turbine blade sub-structure

Bender¹,

Hallett²,

Lindgaard

2019

Composite Structures

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Parametric study of the effect of wrinkle features on the strength of a tapered wind turbine blade sub-structure. Composite Structures, 218, 120-129. AbstractOut of plane wrinkle defects are a major cause of strength reduction in structural composites. Therefore, this paper presents the numerical modelling of a wind turbine blade sub-structure with a tapered beam and a wrinkle. The model is validated against preliminary static tensile tests of a sub-structure without a wrinkle. There is a very good correlation between the predicted and experimentally obtained load at final delamination. A parametric study is then performed using the validated model to determine which wrinkle features are the most important to measure and include when determining the strength of a wrinkled wind turbine blade sub-structure. From the study, it is concluded that the maximum wrinkle angle is the most important feature, but the depth and wash out degree are also important under the right conditions.

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Section: Discussionmentioning

confidence: 99%

“…Based on this, it is assumed that the model can be used to predict the behaviour of a similar sub-structure with different variations of wrinkles included. Further comparison between experiments and numerical models are shown in [13].…”

Section: Experimental Validation Of Modelmentioning

confidence: 99%

Parametric study of the effect of wrinkle features on the strength of a tapered wind turbine blade sub-structure

Bender¹,

Hallett²,

Lindgaard

2019

Composite Structures

Self Cite

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“…Second, defects of the draping, the most prominent of which is wrinkling, can lead to drastic deterioration of the load-carrying ability of the consolidated part and can cause part rejection. Some studies have analysed the influence of the presence of wrinkles, created during manufacturing, on the mechanical performance of the composite [18,19,20,21]. A recent review [22] demonstrates that the presence, pattern and intensity of wrinkling can be accurately modelled once the constitutive model of the reinforcement is identified.…”

Section: Introductionmentioning

confidence: 99%

Identification and validation of a hyperelastic model for self-reinforced polypropylene draping

et al. 2020

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Self-reinforced polypropylene (SRPP) is a composite in which the reinforcement and the matrix consist of the same polymer, namely polypropylene. The present work focuses on the development and experimental validation of an FE model for thermoforming of SRPP. The constitutive model of SRPP sheet is based on the Boisse-Charmetant hyperelastic law. Material properties required to fit the model were obtained from the tensile and picture frame shear tests performed at forming temperatures and bending test of a non-consolidated fabric at room temperature. The model is validated in comparison with the experimental draping data, with special attention to parameters and patterns of wrinkles. Samples, preheated to a surface temperature of 170-175°C, were deformed up to 1-4 cm heights using a hemispherical mould with a 4.5 cm diameter. Overall, good qualitative correlation between experimental and modelling results is observed, which justifies use of the proposed model with the experimentally identified parameters for prediction of SRPP draping and subsequent analysis of the mechanical response of the consolidated part to loading.

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“…Some studies have been conducted on the influence of the manufacturing processes on the mechanical characteristics of composites [ 15 , 16 , 17 ]. The influence of defects and in particular of wrinkles and waviness on the mechanical characteristics of composites were analysed in [ 18 , 19 , 20 , 21 ].…”

Section: Introductionmentioning

confidence: 99%

Textile Composite Damage Analysis Taking into Account the Forming Process

et al. 2020

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The internal structure of composite materials is modified during manufacturing. The formation of woven prepregs or dry preforms changes the angle between the warp and weft yarns. The damage behaviour of the consolidated composite is modified by these changes of angle. It is important when designing a composite part to consider this modification when calculating the damage in order to achieve a correct dimensioning. In this paper, a damage calculation approach of the consolidated textile composite that takes into account the change in orientation of the yarns due to forming is proposed. The angles after forming are determined by a simulation of the draping based on a hypoelastic behaviour of the woven fabric reinforcement. Two orthogonal frames based on the warp and weft directions of the textile reinforcement are used for the objective integration of stresses. Damage analysis of the cured woven composite with non-perpendicular warp and weft directions is achieved by replacing it with two equivalent Unidirectional (UD) plies representing the yarn directions. For each ply, a model based on Continuum Damage Mechanics (CDM) describes the progressive damage. Two examples are presented, a bias extension specimen and the hemispherical forming coupon. In both cases, the angles between the warp and weft yarns are changed. It is shown that the damage calculated by taking into account these angle changes is greatly modified.

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Investigation of the effect of wrinkle features on wind turbine blade sub-structure strength

Cited by 30 publications

References 21 publications

Parametric study of the effect of wrinkle features on the strength of a tapered wind turbine blade sub-structure

Parametric study of the effect of wrinkle features on the strength of a tapered wind turbine blade sub-structure

Identification and validation of a hyperelastic model for self-reinforced polypropylene draping

Textile Composite Damage Analysis Taking into Account the Forming Process

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