Investigation of the Effect of In-Plane Fiber Waviness in Composite Materials through Multiple Scales of Testing and Finite Element Modeling

Lerman, M

doi:10.2172/1505394

Cited by 5 publications

(6 citation statements)

References 18 publications

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“…Producing controllable and repeatable in-plane buckling without other defects is an important step in this work. The method of introducing fiber waviness reported by Lerman 4 was modified and adopted. Out-of-plane waviness, introduced by preforming prepreg stack over a glass rod, was rolled to fabricate in-plane buckling.…”

Section: Methodsmentioning

confidence: 99%

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Influences of in-plane and out-of-plane fiber waviness on mechanical properties of carbon fiber composite laminate

Luo

et al. 2018

Journal of Reinforced Plastics and Composites

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Based on the curing process of carbon fiber/epoxy prepreg with autoclave, two kinds of unidirectional carbon fiber laminates with in-plane and out-of-plane waviness were fabricated by rolling prefabricated out-of-plane waviness and inserting prepreg strip, respectively. Fiber waviness defects in composites were characterized by waviness ratio. The specimens containing fiber waviness were successfully prepared with almost the same fiber content and low porosity. The influences of fiber waviness with different waviness ratio on tensile, compressive, and charpy impact properties of unidirectional laminates were studied, and the corresponding failure modes were observed. The mechanism of the effects of fiber waviness on mechanical properties was discussed. The experimental results show that tensile property and compressive property decrease by in-plane buckling and out-of-plane wrinkling, especially with large waviness ratio. Reduction of 33.0% of compressive strength with out-of-plane wrinkling is seen in the case of 0.037 waviness ratio, while 25.4% reduction is obtained for in-plane buckling under 0.038 waviness ratio. Charpy impact strength decreases by in-plane buckling, whereas increases by out-of-plane wrinkling. Failure morphologies of various specimens are changed by fiber waviness, which are consistent with the mechanical degradation. In addition, there are some differences on the sensitivity of mechanical properties to different types of fiber waviness. Tensile strength is more sensitive to in-plane buckling in comparison with out-of-plane wrinkling, and compressive property is more sensitive to out-of-plane wrinkling.

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Section: Methodsmentioning

confidence: 99%

“…3 Fiber waviness can seriously decrease mechanical properties of composite (e.g., stiffness and strength) and reliability of composite structure, resulting in serious accidents in the engineering application of composite structures. 4,5 Thus, it is important to research and eliminate fiber waviness of composite.…”

Section: Introductionmentioning

confidence: 99%

Influences of in-plane and out-of-plane fiber waviness on mechanical properties of carbon fiber composite laminate

Luo

et al. 2018

Journal of Reinforced Plastics and Composites

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“…Distinct phases of production processes such as fabric layup, gravity, vacuum compaction and friction between tool and composite during vacuum are possible sources for such defects [1], [2]. Each of these processes can result in a unique defect shape, which become complex according to the geometric complexity of the structure [7,11]. Improvements in the blade design for the manufacturing process utilizing simulation of drapability is pointed as key to reducing the occurrence of wrinkles in wind turbine blades.…”

Section: Introductionmentioning

confidence: 99%

“…Numerical modelling along with experimental tests are required to predict the elastic properties in terms of wrinkles configurations. Various methods are applied to represent wrinkles through numerical modelling [7], [8]. A MATLAB-based transfer process using NDT measurements is applied to generate a material-property map to generate a Gaussianenvelope cosine-shape fit to wrinkles [1].…”

Section: Introductionmentioning

confidence: 99%

Finite Element Model to Predict the Impact of Wrinkles on Wind Turbine Blades

Mendonça

Mikkelsen

Branner

2022

J. Phys.: Conf. Ser.

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Among the manufacturing defects of wind turbine blades, wrinkles are critical to the blade performance, affecting the structural integrity. Therefore, this paper introduces three-dimensional numerical models of laminates representative of a wind turbine blade with artificial wrinkles. The models are verified against static tension-compression experimental tests of laminates embedded with two types of wrinkles. The results show a good correlation between numerical prediction and experimentally obtained stiffness behaviour. The outcome of this analysis proves the validity of the numerical modelling strategy applied to evaluate the behaviour of laminates with wrinkles for a static loading situation.

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“…Nevertheless, most of the time, it was found to be induced by the manufacturing process. The production of defect-free composites is difficult, especially when the part does not have a conventional shape and involves one or more directions and degrees of curvature [5]. Hassan et al [3] have reviewed the manufacturing defects occurring in complex shaped laminated composites.…”

Section: Introductionmentioning

confidence: 99%

Experimental analysis of the effects of wrinkles in the radius of curvature of L-shaped carbon-epoxy specimens on unfolding failure

Journoud

Castanié

Ratsifandrihana³

2022

Composites Part A: Applied Science and Manufacturing

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Investigation of the Effect of In-Plane Fiber Waviness in Composite Materials through Multiple Scales of Testing and Finite Element Modeling

Cited by 5 publications

References 18 publications

Influences of in-plane and out-of-plane fiber waviness on mechanical properties of carbon fiber composite laminate

Influences of in-plane and out-of-plane fiber waviness on mechanical properties of carbon fiber composite laminate

Finite Element Model to Predict the Impact of Wrinkles on Wind Turbine Blades

Experimental analysis of the effects of wrinkles in the radius of curvature of L-shaped carbon-epoxy specimens on unfolding failure

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