Evaluation of Computed Tomography Data from Fibre Reinforced Polymers to Determine Fibre Length Distribution
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D. Salaberger
Abstract
Sub-μm computed tomography (sub-μm-CT) was used to determine the fibre orientation and fibre length distribution in long glass fibre filled polypropylene. For data evaluation two different concepts based on the application of a sequence of different filters were applied. The first concept is based on segmentation by binarisation using a global threshold, followed by a detailed analysis of regions where fibres are touching. The second concept is based on analysis of the original gray value image. For each voxel the local fibre orientation is determined by calculating the Hessian Matrix and analysing its Eigen values.
The effectivity of the two data analysis concepts in determining orientation and length was investigated. For this purpose the algorithms were applied to specimens with four different levels of fibre content: 1, 5, 10 and 30% by weight. To quantify the level of error in fibre determination, a minimum and average probability for correct fibre determination were estimated.
The results show a strong dependence of the level of error on the fibre content. Whilst the determination of fibre orientation is not significantly affected, determination of fibre length distribution is significantly influenced by fibre content. For samples with fibre content above 5%, concept 1 does not produce correct representations of all fibres. In particular, problems arise if the fibres are touching. Concept 2 delivers much better results and represents most of the fibres correctly even at higher fibre content levels and for touching fibres. This was proven by using artificial CT-data sets generated by CT-simulation and by systematic comparisons. A practical application of the CT-evaluation pipeline is presented for glass fibre reinforced rings produced by injection-moulding and extrusion. For both samples the orientation tensors are calculated and the orientations of the fibres are visualized in three dimensions by colour coding.
References
Bradsky von, G. J., et al., “Characterisation of Finite Length Composites – Part IV: Structural Studies on Injection-Moulded Composites”, Pure Appl. Chem., 12, 2523–2539(1997)10.1351/pac199769122523Suche in Google Scholar
Clarke, A. R., et al., “A Novel Technique for Determining the 3D Spatial Distribution of Glass Fibres in Polymer Composites”, Comp. Sci. Tech., 55, 75–91(1995), DOI: 10.1016/0266-3538(95)00087-9Suche in Google Scholar
Fu, S., et al., “Correction of the Measurement of Fiber Length of Short Fiber Reinforced Thermoplastics”, Composites Part A., 33, 1549–1555(2002), DOI: 10.1016/S1359-835X(02)00114-8Suche in Google Scholar
Kastner, J. (Ed.):, Industrielle Computertomografie Tagung, Wels, Austria, Shaker Verlag, Aachen(2008a)Suche in Google Scholar
Kastner, J., et al., “Determination of Diameter, Length and Three-dimensional Distribution of Fibres in Short Glass-fibre Reinforced Injection-moulded Parts by μ-X-ray Computed Tomography”, Proceedings PPS24, Salerno, Italy (2008b)Suche in Google Scholar
Kastner, J., et al., “Method for Three-dimensional Evaluation and Visualization of the Distribution of Fibres in Glass-fibre Reinforced Injection Molded Parts by μ-X-ray Computed Tomography”, WCNDT Proceedings CD, Shanghai (2008c)Suche in Google Scholar
Matsuoka, T., “Chapter 3 Fiber Orientation Prediction in Injection Molding”, in Polypropylene Structure, Blends and Composites, Volume 3 Composites, Karger-Kocsis, J. (Ed.), Chapman & Hall, London, p. 113–141(1995)10.1007/978-94-011-0523-1Suche in Google Scholar
Otsu, N., “A Threshold Selection Method from Grey Level Histograms”, IEEE Transactions on Systems, Man, and Cybernetics, 9, 62–66(1979)10.1109/TSMC.1979.4310076Suche in Google Scholar
Park, C. H., et al., “A Study on Fibre Orientation in the Compression Molding of Fibre Reinforced Polymer Composite Materials”, Mat. Proc. Tech., 11, 233–239(2001), DOI: 10.1016/S0924-0136(01)00523-4Suche in Google Scholar
Phelps, J. H., et al., “New Models for Fibre Orientation in Injection Molded Composites”, Proceedings PPS24, Salerno, Italy (2008)Suche in Google Scholar
Reiter, M., et al., “Improvement of X-ray Image Acquisition Using a GPU Based 3D CT Simulation Tool”, SPIE Quality Control by Artificial Vision Wels, Austria (2009)Suche in Google Scholar
Requena, G., et al., “3D-Quantification of the Distribution of Continuous Fibres in Unidirectionally reinforced Composites”, Composites Part A, 40, 152–163, (2009), DOI: 10.1016/j.compositesa.2008.10.014Suche in Google Scholar
Shen, H., et al., “Direct Observation and Measurement of Fibre Architecture in Short fibre Polymer Composite Foam through Micro-CT Imaging”, Comp. Sci. Tech., 64, 2113–2120(2004), DOI: 10.1016/j.compscitech.2004.03.003Suche in Google Scholar
Teßmann, M., et al., “Automatic Determination of Fiber Length Distribution in Composite Material Using 3D CT Data”, EURASIP Journal on Advances in Signal Processing, article ID 545030 (2010), DOI: 10.1155/2010/545030Suche in Google Scholar
Vas, L. M., et al., “Active Fiber Length Distribution and its Application to Determine the Critical Fiber Length”, Polym. Test., vol. 28, Oct. 2009, pp. 752–75910.1016/j.polymertesting.2009.06.006Suche in Google Scholar
Vincent, M., et al., “Description and Modelling of Fibre Orientation in Injection Molding of Fibre Reinforced Thermoplastics”, Polymer, 46, 6719–6725(2005), DOI: 10.1016/j.polymer.2005.05.026Suche in Google Scholar
Zak, G., et al., “Estimation of Average Fibre Length in Short-fibre Composites by a Two-Section Method”, Comp. Sci. Tech., 60, 1763–1772(2000), DOI: 10.1016/S0266-3538(00)00065-8Suche in Google Scholar
© 2011, Carl Hanser Verlag, Munich
Artikel in diesem Heft
- Contents
- Contents
- Editorial
- IPP Special Issue on “Injection Molding and Molds”
- Special Issue on Injection Molding and Molds
- Influence of Pressure on Volume, Temperature and Crystallization of Thermoplastics during Polymer Processing
- Study of Microcellular Injection Molding with Expandable Thermoplastic Microsphere
- Hybrid Moulds with Epoxy-based Composites – Effects of Materials and Processing on Shrinkage and Warpage
- The Effects of Various Variotherm Processes and Their Mechanisms on Injection Molding
- Establishment of Gas Counter Pressure Technology and Its Application to Improve the Surface Quality of Microcellular Injection Molded Parts
- Evaluation of Computed Tomography Data from Fibre Reinforced Polymers to Determine Fibre Length Distribution
- Influence of Processing Parameters on the Fiber Length and Impact Properties of Injection Molded Long Glass Fiber Reinforced Polypropylene
- Replication Properties and Structure of PC in Micromolding with Heat Insulator Mold Using Zirconia Ceramic
- Replication of Stochastic and Geometric Micro Structures – Aspects of Visual Appearance
- Quantified Surface Improvement Using Temperature Cycle Injection Moulding
- Simulation of Injection Molding Using a Model with Delayed Fiber Orientation
- PPS-News
- PPS News
- Seikei Kakou Abstracts
- Seikei-Kakou Abstracts
Artikel in diesem Heft
- Contents
- Contents
- Editorial
- IPP Special Issue on “Injection Molding and Molds”
- Special Issue on Injection Molding and Molds
- Influence of Pressure on Volume, Temperature and Crystallization of Thermoplastics during Polymer Processing
- Study of Microcellular Injection Molding with Expandable Thermoplastic Microsphere
- Hybrid Moulds with Epoxy-based Composites – Effects of Materials and Processing on Shrinkage and Warpage
- The Effects of Various Variotherm Processes and Their Mechanisms on Injection Molding
- Establishment of Gas Counter Pressure Technology and Its Application to Improve the Surface Quality of Microcellular Injection Molded Parts
- Evaluation of Computed Tomography Data from Fibre Reinforced Polymers to Determine Fibre Length Distribution
- Influence of Processing Parameters on the Fiber Length and Impact Properties of Injection Molded Long Glass Fiber Reinforced Polypropylene
- Replication Properties and Structure of PC in Micromolding with Heat Insulator Mold Using Zirconia Ceramic
- Replication of Stochastic and Geometric Micro Structures – Aspects of Visual Appearance
- Quantified Surface Improvement Using Temperature Cycle Injection Moulding
- Simulation of Injection Molding Using a Model with Delayed Fiber Orientation
- PPS-News
- PPS News
- Seikei Kakou Abstracts
- Seikei-Kakou Abstracts
