Numerical Simulations of the Creep Deformation of MMCs in 4-Point Bending Mode

[+] Author and Article Information
Thomas Daxner, Franz G. Rammerstorfer

Institute of Lightweight Structures and Aerospace Engineering, Vienna University of Technology, Gusshausstr., 27–29, A-1040 Vienna, Austria

Javier Segurado, Heinz E. Pettermann

Division of Materials Technology, Austrian Research Centers, A-2444 Seibersdorf, Austria

J. Eng. Mater. Technol 125(1), 50-55 (Dec 31, 2002) (6 pages) doi:10.1115/1.1525253 History: Received January 05, 2002; Revised August 14, 2002; Online December 31, 2002
Copyright © 2003 by ASME
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Neubauer, E., and Degischer, H. P., 2001, “Creep Resistance and Creep Bending Resistance of Light Metal Matrix Composites for Research in Airframe Structural Efficiency,” AMTT Report ÖFZS-W-0098, ARC Seibersdorf Research GmbH, Seibersdorf, Austria.
ANSYS Guides Release 5.6, 2001, ANSYS Inc., Canonsburg, PA.
Weissenbek, E., 1994, “Finite Element Modeling of Discontinuously Reinforced Metal Matrix Composites,” dissertation, ILFB, Vienna University of Technology, VDI Verlag, Düsseldorf.
Degischer, H. P., 1990, “Temperature Dependent Stress-Strain Curves for Pure Aluminum,” internal report, AMAG, Ranshofen, Austria.
Segurado, J., and Pettermann, H. E., 2001, “Simulation of 4-Point Bending Creep Test,” AMTT Report ÖFZS-W-0098, Annex 1, ARC Seibersdorf Research GmbH, Seibersdorf, Austria.
Pettermann,  H. E., and Suresh,  S., 2000, “A Comprehensive Unit Cell Model: A Study of Coupled Effects in Piezoelectric 1-3 Composites,” Int. J. Solids Struct., 37, pp. 5447–5464.


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Scheme of a symmetry half of the two different macromechanical models; layer model (a) and overlay model (b)
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Elasto-plastic stress-strain relationships at 4 different temperatures for the aluminum matrix material 4
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Comparison between the linear elastic and the elastic-plastic force-deflection predictions for the sample A2
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Predicted axial stress distribution in the beam symmetry plane for the sample A2, after heating and bending, but prior to creep
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Predicted shear stress distribution between supports and loading points for the sample A2, after heating and bending, but prior to creep
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Elasto-plastic and creep deformation at 300°C and a constant force level (sample A2)
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Micromechanical FE models representing fiber-matrix topologies; original unit cell (left) and flipped unit cell (right)
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Contour plot of the creep shear strains at the end of the active loading history
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Shear creep (rate) predicted by the micromechanical unit cell FE models normalized by the shear creep (rate) in a layered unit cell



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