Funder:	This work was supported by the UKRI - Engineering and Physical Sciences Research Council Grant 'Certification for Design - Reshaping the Testing Pyramid' EP/S017038/1. 
		Jiraphant Srisuriyachot is funded by GKN Aerospace. 
		The Diamond Light Source is acknowledged for providing the beamtime on I13-2 beamline under the experiment number MG28362-2.
Dataset DOI:	TBA
Full citation:	Srisuriyachot, J., in press
Publication DOI: https://doi.org/10.1016/j.compositesb.2023.111038
Licence: 	Attribution 4.0 International (CC BY 4.0)

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DESCRIPTION OF THE INVESTIGATION
## This section should be used to describe the overall project as the 'investigation'. It should appear at the start of every readme file for the project.

Title: 		Synchrotron micro-CT in kink-band formation of UD-CFRP laminates with microdefects
Start Date: November 2021
End Date:	September 2023

Summary:	This paper presents synchrotron micro-Computed Tomography (micro-CT) study on in-situ pure
			compressive kink-band failure in Uni-Directional Carbon Fibre-Reinforced Polymer composites
			(UD-CFRPs) with a notch. The study compares the failure behaviour of baseline samples under
			standard conditions with defect-rich samples containing micro-defects such as voids and fibre
			misalignment. Quantitative image-based analysis using the structure tensor technique and Digital
			Volume Correlation (DVC) reveals changes in fibre misalignment orientation and localised
			strain, respectively, at each increment load. A large 400 μm kink-band inclined at 30◦ with a
			half-cosine wave fibre orientation is observed in the baseline samples, while the defect-rich
			samples form narrower conjugate kink bands (ranging from 77 μm to 25 μm) inclined at 45◦.
			Development of kink-band formations/failure of both samples is discussed and compared with
			literature, providing key implications for the design and safe use of this type of composite layup.
			
Keywords:	A. Carbon fibre 
			B. Defects 
			C. Micro-mechanics 
			D. Non-destructive testing 
			Kink-band formation

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FACILITY

Facility Full name:	Diamond Light Source
Facility description:	Diamond Light Source (or Diamond) is the UK's national synchrotron light source science facility located at the Harwell Science and Innovation Campus in Oxfordshire.
Facility URL:	https://www.diamond.ac.uk/Home.html


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INSTRUMENT

Instrument full name: 	Diamond Manchester Imaging Branchline (I13-2)
Instrument type: 	Tomography
Instrument description:	19 keV, PCO.edge high speed 5.5 X-ray camera

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STUDY
## This section should be the same for each dataset arising from the same study or workpackage. There might be multiple readme files for the same study if there are many datasets arising from the study. 

Study name: 	Kink-band analysis
Start Date: 	June 2022
Description: 	Strain field measurement and fibre misalignment analysis

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SAMPLE

Sample name: 		Baseline sample
Sample type: 		Carbon fibre composite 
Sample description:	3x3.2x15 sample dimension with 4 degree offset angle to the direction of load and a notch 

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SAMPLE

Sample name: 		Defect sample
Sample type: 		Carbon fibre composite 
Sample description:	3x3.2x15 sample dimension with 4 degree offset angle to the direction of load and a notch containg voids
	
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DATASET

Dataset name:	Raw_image
Dataset description: 	Raw CT image
Dataset start date:	November 2021
Dataset end date: 	November 2021

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DATAFILE
Datafile name: 		raw_baseline_0.00Xc-8bits_1300x1800x1200.raw
Datafile description: 	baseline sample at 0.00 compressive strength (Xc) 8bits image with image dimensions of 1300x1800x1200 
Datafile file size: 	2.61 GB


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DATASET

Dataset name:	DVC
Dataset description: 	Digital volume correlation results; conducted with "kintsugi" DVC global-based approach
						Image registration is performed with FFT method
Dataset start date:	September 2022
Dataset end date: 	September 2022

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DATAFILE
Datafile name: 		DVC_baseline_0.89Xc.vtk
Datafile description: 	DVC result of baseline sample at 0.89 compressive strength (Xc) (open with paraview)
Datafile file size: 	124 MB


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DATASET

Dataset name:	Fibre misalignment analysis
Dataset description: 	Fibre misalignment results; conducted with Structure tensor analysis
						Image gradient vector is converted to relative angle to a reference angle (4 degree in in-plane, xz and 0 degree in out-of-plane, yz)
						Data has been sampling to reduce the file size. The sampling rate of 3x3x3 was applied to the original data.
Dataset start date:	September 2022
Dataset end date: 	September 2022

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DATAFILE
Datafile name: 		fibre_orientation_baseline_0.00Xc
Datafile description: 	fibre orientation result of baseline sample at 0.00 compressive strength (Xc) (open with paraview)
Datafile file size: 	714 MB



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