Imaging of composites by helical X-ray computed tomography

Ying Wang; Grzegorz Pyka; Kristine M. Jespersen; Lars P. Mikkelsen; Philip Withers

Imaging of composites by helical X-ray computed tomography

Ying Wang, Grzegorz Pyka, Kristine M. Jespersen, Lars P. Mikkelsen, Philip Withers

Research output: Contribution to conference › Paper › peer-review

Abstract

Understanding the fatigue damage mechanisms of composite materials used in wind turbine rotor blades could potentially enhance the reliability and energy efficiency of wind turbines by improving the structure design. In this paper, the fatigue damage propagating mechanisms of unidirectional glass fibre composites was characterised by helical X-ray CT. The staining approach was used and it was effective to enhance the visibility of thin matrix cracks and partly closed fibre breaks instead of widely opened cracks. Fibre breaks in the centre UD bundle were found to occur locally, instead of being evenly distributed along the 0° fibre direction after 500,000 cycles. The locations of these damage sites were found to be correlated with intersecting points of +/-80° backing bundles. At higher number of cycles, edge effect becomes dominant with extensive fibre breaks in the edge UD bundles and matrix cracks in the resin-rich region.

Original language	English
Publication status	Published - Aug 2017
Event	21st International Conference on Composite Materials - Xi'an, China Duration: 20 Aug 2017 → 25 Aug 2017

Conference

Conference	21st International Conference on Composite Materials
Abbreviated title	ICCM21
Country/Territory	China
City	Xi'an
Period	20/08/17 → 25/08/17

Keywords

Helical imaging
Staining
Fatigue
Fibre break
Matrix crack

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

Cite this

@conference{8f2140410f7745779ad703e51fd05cdf,

title = "Imaging of composites by helical X-ray computed tomography",

abstract = "Understanding the fatigue damage mechanisms of composite materials used in wind turbine rotor blades could potentially enhance the reliability and energy efficiency of wind turbines by improving the structure design. In this paper, the fatigue damage propagating mechanisms of unidirectional glass fibre composites was characterised by helical X-ray CT. The staining approach was used and it was effective to enhance the visibility of thin matrix cracks and partly closed fibre breaks instead of widely opened cracks. Fibre breaks in the centre UD bundle were found to occur locally, instead of being evenly distributed along the 0° fibre direction after 500,000 cycles. The locations of these damage sites were found to be correlated with intersecting points of +/-80° backing bundles. At higher number of cycles, edge effect becomes dominant with extensive fibre breaks in the edge UD bundles and matrix cracks in the resin-rich region.",

keywords = "Helical imaging, Staining, Fatigue, Fibre break, Matrix crack",

author = "Ying Wang and Grzegorz Pyka and Jespersen, {Kristine M.} and Mikkelsen, {Lars P.} and Philip Withers",

year = "2017",

month = aug,

language = "English",

note = "21st International Conference on Composite Materials, ICCM21 ; Conference date: 20-08-2017 Through 25-08-2017",

}

TY - CONF

T1 - Imaging of composites by helical X-ray computed tomography

AU - Wang, Ying

AU - Pyka, Grzegorz

AU - Jespersen, Kristine M.

AU - Mikkelsen, Lars P.

AU - Withers, Philip

PY - 2017/8

Y1 - 2017/8

N2 - Understanding the fatigue damage mechanisms of composite materials used in wind turbine rotor blades could potentially enhance the reliability and energy efficiency of wind turbines by improving the structure design. In this paper, the fatigue damage propagating mechanisms of unidirectional glass fibre composites was characterised by helical X-ray CT. The staining approach was used and it was effective to enhance the visibility of thin matrix cracks and partly closed fibre breaks instead of widely opened cracks. Fibre breaks in the centre UD bundle were found to occur locally, instead of being evenly distributed along the 0° fibre direction after 500,000 cycles. The locations of these damage sites were found to be correlated with intersecting points of +/-80° backing bundles. At higher number of cycles, edge effect becomes dominant with extensive fibre breaks in the edge UD bundles and matrix cracks in the resin-rich region.

AB - Understanding the fatigue damage mechanisms of composite materials used in wind turbine rotor blades could potentially enhance the reliability and energy efficiency of wind turbines by improving the structure design. In this paper, the fatigue damage propagating mechanisms of unidirectional glass fibre composites was characterised by helical X-ray CT. The staining approach was used and it was effective to enhance the visibility of thin matrix cracks and partly closed fibre breaks instead of widely opened cracks. Fibre breaks in the centre UD bundle were found to occur locally, instead of being evenly distributed along the 0° fibre direction after 500,000 cycles. The locations of these damage sites were found to be correlated with intersecting points of +/-80° backing bundles. At higher number of cycles, edge effect becomes dominant with extensive fibre breaks in the edge UD bundles and matrix cracks in the resin-rich region.

KW - Helical imaging

KW - Staining

KW - Fatigue

KW - Fibre break

KW - Matrix crack

M3 - Paper

T2 - 21st International Conference on Composite Materials

Y2 - 20 August 2017 through 25 August 2017

ER -

Imaging of composites by helical X-ray computed tomography

Abstract

Conference

Keywords

UN SDGs

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