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

D. Wilhelmsson; Lars Pilgaard Mikkelsen; Søren Fæster; L. E. Asp

doi:10.1016/j.compositesa.2019.01.018

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

D. Wilhelmsson, Lars Pilgaard Mikkelsen, Søren Fæster, L. E. Asp^*

^*Corresponding author for this work

Chalmers University of Technology

Research output: Contribution to journal › Journal article › Research › peer-review

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Abstract

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° to 20° are tested in compression. The measured compressive strength is found practically constant for off-axis angles between 0° and 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.

Original language	English
Journal	Composites - Part A: Applied Science and Manufacturing
Volume	119
Pages (from-to)	283-290
Number of pages	8
ISSN	1359-835X
DOIs	https://doi.org/10.1016/j.compositesa.2019.01.018
Publication status	Published - 2019

Keywords

Carbon fibres
Finite element analysis (FEA)
CT analysis
Mechanical testing

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10.1016/j.compositesa.2019.01.018

BSOG 1 s2Accepted author manuscript, 2.11 MBLicence: CC BY-NC-ND

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Mikkelsen, L. P., Fæster, S., Vogeley, E. & Sørensen, B. F.
01/01/2021 → …
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title = "Influence of in-plane shear on kink-plane orientation in a unidirectional fibre composite",

abstract = "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° to 20° are tested in compression. The measured compressive strength is found practically constant for off-axis angles between 0° and 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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author = "D. Wilhelmsson and Mikkelsen, {Lars Pilgaard} and S{\o}ren F{\ae}ster and Asp, {L. E.}",

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T1 - Influence of in-plane shear on kink-plane orientation in a unidirectional fibre composite

AU - Wilhelmsson, D.

AU - Mikkelsen, Lars Pilgaard

AU - Fæster, Søren

AU - Asp, L. E.

PY - 2019

Y1 - 2019

N2 - 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° to 20° are tested in compression. The measured compressive strength is found practically constant for off-axis angles between 0° and 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.

AB - 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° to 20° are tested in compression. The measured compressive strength is found practically constant for off-axis angles between 0° and 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.

KW - Carbon fibres

KW - Finite element analysis (FEA)

KW - CT analysis

KW - Mechanical testing

U2 - 10.1016/j.compositesa.2019.01.018

DO - 10.1016/j.compositesa.2019.01.018

M3 - Journal article

AN - SCOPUS:85061391371

SN - 1359-835X

VL - 119

SP - 283

EP - 290

JO - Composites - Part A: Applied Science and Manufacturing

JF - Composites - Part A: Applied Science and Manufacturing

ER -

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

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Keywords

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