An experimental study of fibre waviness and its effects on compressive properties of unidirectional NCF composites

Wilhelmsson, Dennis; Gutkin, Renaud; Edgren, Fredrik; Asp, Leif

doi:10.1016/j.compositesa.2018.02.013

Cited by 85 publications

(30 citation statements)

References 19 publications

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“…Visual inspection and optical microscopy showed kinking to occur out-of-plane in all offaxis specimens. However, unlike the 0 • specimens, where kinking only took place out of the plane in the previous study [11], the off-axis specimens were found to have a component of kinking also in the plane. Furthermore, as the off-axis angle was increased, the amount of in-plane kinking increased as well.…”

Section: Experimental Compression Testscontrasting

confidence: 71%

“…Furthermore, the maximum fibre misalignment angle out-of-plane, θ max , which controls the compressive strength of the UD laminates (i.e. loaded along the fibres) was characterised by Wilhelmssson et al [11]. The maximum out-of-plane misalign-ment angle was found to be 8.0 • for the studied UD laminate (i.e.…”

Section: Test Specimens and Mechanical Compression Testsmentioning

confidence: 84%

“…It is noted in Table 2 that three out of five laminates exceeded this requirement. The issue of excessive bending has been thoroughly investigated in a previous study where it was concluded that it did not significantly affect the measured compressive strengths [11].…”

Section: Test Specimens and Mechanical Compression Testsmentioning

confidence: 99%

“…Note that the experimental value of the longitudinal stiffness contain the stiffness reduction caused by fibre waviness [11,15]. The transverse and shear moduli reported in Table 4 were characterised for the same material system by Bru et al [15].…”

Section: Numerical Modellingmentioning

confidence: 99%

“…The reason for limited dependency of compressive strength on off-axis angles were studied and discussed in the 1990's [19]. [11]. Furthermore, all these UD laminates loaded in the fibre direction failed by kinking out of plane.…”

Section: The Effect Of ψ On Compressive Strengthmentioning

confidence: 99%

See 4 more Smart Citations

Influence of in-plane shear on kink-plane orientation in a unidirectional fibre composite

Wilhelmsson

Mikkelsen

Fæster

et al. 2019

Composites Part A: Applied Science and Manufacturing

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Kink-band formation is the governing failure mechanism for compressive failure of fibre reinforced composites. Here, kink-plane orientation, describing the direction of kink-band formation, is studied using X-ray computed tomography (CT). Unnotched unidirectional specimens with off-axis angles ranging from 0-20 • are tested in compression. The measured compressive strength is found practically constant for off-axis angles between 0-10 •. For an off-axis angle of 15 • the compressive strength drops dramatically. CT-results reveal this drop to be consistent with a transition from out-of-plane to in-plane dominated kinking. Furthermore, results show the kink-plane angle to be linearly dependant on off-axis angle, and hence in-plane shear stress. A three-dimensional finite element model considering measured fibre misalignment angles through its volume is generated for numerical analysis. Numerical predictions based on the LaRC05 kinking criterion are found to qualitatively capture the experimentally observed effects of off-axis angle on kink-plane orientation.

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Section: Experimental Compression Testscontrasting

confidence: 71%

Section: Test Specimens and Mechanical Compression Testsmentioning

confidence: 84%

Section: Test Specimens and Mechanical Compression Testsmentioning

confidence: 99%

Section: Numerical Modellingmentioning

confidence: 99%

Section: The Effect Of ψ On Compressive Strengthmentioning

confidence: 99%

See 3 more Smart Citations

Influence of in-plane shear on kink-plane orientation in a unidirectional fibre composite

Wilhelmsson

Mikkelsen

Fæster

et al. 2019

Composites Part A: Applied Science and Manufacturing

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A non‐crimp fabric mechanical characterization for the production of aerospace components

Lepore

Ferrante

Sanguigno

et al. 2021

Mat Design & Process Comms

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Interlayer interaction characteristics of multi‐layered plain woven glass fabric in hemisphere forming

Mei

Wei

et al. 2022

Polymer Composites

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Characterizing the interlayer interaction is beneficial to mitigate the manufacturing defects in the multi‐layered fabric forming of composite. However, the interlayer interactions including the force and sliding distance, and their effects on the defect generation have not been reported yet. Here, the monolayer and multi‐layered fabric hemisphere forming were conducted by experiments. Firstly, the forming force and deformation modes at different hemisphere regions are confirmed in the monolayer fabric forming as a reference. Then, in the multi‐layered forming, the interlayer interaction is confirmed to still exist in the configuration with the same ply orientations, whereas the forming force, forming force rate, and interlayer sliding are smaller than that in the configuration with different ply orientations. In addition, with the increase of layer number, the extent of interlayer interaction is improved, which intensifies the defect from the out of plane yarn buckling to the macro wrinkle in the tensile direction. Especially, it is revealed that the tensile direction of lower layer should be avoided under the shear direction of upper layer to reduce the interlayer sliding. These results obtained here provide an important reference to the multi‐layered plain woven fabric forming.

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An experimental study of fibre waviness and its effects on compressive properties of unidirectional NCF composites

Cited by 85 publications

References 19 publications

Influence of in-plane shear on kink-plane orientation in a unidirectional fibre composite

Influence of in-plane shear on kink-plane orientation in a unidirectional fibre composite

A non‐crimp fabric mechanical characterization for the production of aerospace components

Interlayer interaction characteristics of multi‐layered plain woven glass fabric in hemisphere forming

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