A novel image analysis procedure for measuring fibre misalignment in unidirectional fibre composites

A novel image analysis procedure for measuring fibre misalignment in unidirectional fibre composites

A novel image analysis procedure named Fourier transform misalignment analysis (FTMA) for measuring fibre misalignment in unidirectional fibre composites is presented. Existing methods are briefly illustrated and evaluated. The FTMA-method is presented, describing the specimen preparation and elabor...

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Bibliographic Details
Published in:Composites science and technology Vol. 69; no. 2; pp. 228 - 238
Main Authors: Kratmann, K.K., Sutcliffe, M.P.F., Lilleheden, L.T., Pyrz, R., Thomsen, O.T.
Format: Journal Article
Language:English
Published: Kidlington Elsevier Ltd 01-02-2009
Elsevier
Subjects:
A. Carbon fibres
A. Polymer–matrix composites
Applied sciences
B. Strength
D. Optical microscopy
E. Pultrusion
Exact sciences and technology
Forms of application and semi-finished materials
Laminates
Polymer industry, paints, wood
Technology of polymers
B. Strength
E. Pultrusion
D. Optical microscopy
A. Carbon fibres
A. Polymer–matrix composites
Fourier transformation
Laminate
Unidirectional fiber material
Fiber reinforced material
Polymer
A. Polymer-matrix composites
Experimental study
Mineral fiber
Composite material
Image analysis
Manufacturing defect
Fiber orientation
Measurement method
Carbon fiber
Pultrusion
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Summary:A novel image analysis procedure named Fourier transform misalignment analysis (FTMA) for measuring fibre misalignment in unidirectional fibre composites is presented. Existing methods are briefly illustrated and evaluated. The FTMA-method is presented, describing the specimen preparation and elaborating how the image analysis algorithm uses Fourier transformation and a least squares method to compute single fibre orientations. On the basis of parameter investigations the robustness of the FTMA-method is investigated. Software generated micrographs with known fibre misalignment are used to determine the precision of the method. The precision is used, along with computation time and memory usage, to benchmark the FTMA-method against the existing multiple field image analysis (MFIA) method. It is found that the FTMA-method is at least as accurate as existing methods. Furthermore, the FTMA-method is much faster than the existing methods, completing a typical analysis in approximately 1 min. Overall, it is concluded that the FTMA-method is a robust, precise and time efficient tool for determining fibre misalignment in unidirectional fibre composites, offering a higher degree of detail than the existing MFIA-method.
Bibliography:ObjectType-Article-2
SourceType-Scholarly Journals-1
ObjectType-Feature-1
content type line 23
ISSN:0266-3538
1879-1050
DOI:10.1016/j.compscitech.2008.10.020