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Determination of Elastic Properties for a Wound Oxide Ceramic Composite
Y. Shi1, S. Hofmann1, R. Jemmali1, S. Hackemann 2, D. Koch1
1 Institute of Structures and Design, German Aerospace Center Stuttgart, Pfaffenwaldring 38 – 40, D-70569 Stuttgart, Germany
2 Institute of Materials Research, German Aerospace Center Cologne, Linder Höhe, D-51147 Köln, Germany
received October 18, 2013, received in revised form December 9, 2013, accepted December 18, 2013
Vol. 5, No. 1, Pages 31-38 DOI: 10.4416/JCST2013-00028
Abstract
Thanks to its low cost and high flexibility, in the last few years the winding technique has been successfully adapted for the production of complex Ceramic Matrix Composite (CMC) components with load-oriented fibre alignment. Since the winding angle can be adjusted in any direction (from 0° to 90°) during the fabrication process, it is important for the design of components to evaluate the elastic properties of CMCs as a function of the winding angle.
In this study, an inverse method based on the Classic Laminate Theory (CLT) has been used for the prediction of the elastic properties, i.e. Young's modulus, shear modulus and Poisson's ratio, for a wound oxide CMC material, called WHIPOX® (Wound HIghly Porous OXide ceramic matrix composite). For this purpose the characteristics of an equivalent unidirectional layer (UD-layer) with consideration of fibre volume content (FVC) and porosity were calculated. On the basis of microstructural analysis the computed WHIPOX® UD properties have been divided into two sets of elastic properties for small (below 30°) and large winding angles (30° and above). Full coverage of the mechanical properties in different wound orientations, non-orthogonal with ±3°/±87°, ±15°/±75°, ±30°/±60° and orthogonal with ±45° and 0°/90°, were evaluated with in-plane tension, and Iosipescu-shear tests. A good correlation between experimental and analytically calculated results is shown in this paper.
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Keywords
Ceramic matrix composite, fibre orientation, elastic properties, inverse laminate theory, equivalent unidirectional layer
References
1 Göring, J., Hackemann, S., Kanka, B.: WHIPOX®: A fibre-reinforced oxide ceramic material for high-temperature long-term applications, (in German), Mat.-wiss. u. Werkstofftech., 38, [9], 766 – 772, (2007).
2 Schmidt, S., Beyer, B., Knabe, H., Immich, H., Meistring, R., Gessler, A.: Advanced ceramic matrix composite materials for current and future propulsion technology applications, Acta Astronaut., 55, [3 – 9], 409 – 420, (2004).
3 Herbell, T.P., Eckel, A.J.: Ceramic matrix composites for rocket engine turbine applications, J. Eng. Gas. Turb. Power, 115, [1], 64 – 69, (1993).
4 Huang, Z.M.: The mechanical properties of composites reinforced with woven and braided fabrics, Compos. Sci. Technol., 60, [7], 479 – 498, (2000).
5 Carey, J., Munro, M., Fahim, A.: Longitudinal elastic modulus prediction of a 2-D braided fiber composite, J. Reinf. Plast. Comp., 22, [9], 813 – 831, (2003).
6 Potluri, P., Manan, A.: Mechanics of non-orthogonally interlaced textile composites, Compos. Part A., 38, [4], 1216 – 1226, (2007).
7 Srikanth, L., Rao, R.M.V.G.K.: Concurrent studies on braided and filament wound carbon fiber composites – a comparative appraisal, J. Reinf. Plast. Comp., 30, [16], 1359 – 1365, (2011).
8 Xu, L., Kim, S.J., Ong, C.H., Ha, S.K.: Prediction of material properties of biaxial and triaxial braided textile composites, J. Compos. Mater., 16, [18], 2255 – 2270, (2012).
9 Zebdi, O., Boukhili, R., Trochu, F.: An inverse approach based on laminate theory to calculate the mechanical properties of braided composites, J. Reinf. Plast. Comp., 28, [23], 2911 – 2930, (2009).
10 Tushtev, K., Koch, D., Grathwohl, G.: Elastic properties of braided ceramic matrix composites, Int. J. Mater. Res., 99, [11], 1262 – 1267 (2008).
11 Chawla, K.K.: Ceramic matrix composites, Chapman & Hall, London. 1993.
12 Iosipescu, N.: New accurate procedure for single shear testing of metals, J. Mater., 2, 537 – 566, (1967).
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