Communications - Scientific Letters of the University of Zilina 2000, 2(3):4-7 | DOI: 10.26552/com.C.2000.3.4-7
Experimental investigation of the strength of anisotropic solids under biaxial loading oblique to the principal material directions
- 1 Institute for Strength of Materials, Vienna University of Technology, Vienna, Austria
Realistic finite element ultimate load analyses of structural details as well as of shell structures made of anisotropic materials require suitable constitutive equations for the prediction of the deformational behavior and ultimate strength of biaxially loaded solids. However, there is a lack of adequate biaxial experimental data, particularly if loading situations are considered where the principal loading directions do not coincide with the principal material directions.
From the theoretical point of view one has to obey the stress-strain relationship. There is no principal difference in dealing with different kinds of anisotropic materials, such as biological tissues (human skin), anisotropic rubbers, woven fabrics (textures), reinforced polymers and any kind of plastic deformed membranes. However, the design of the experiment, the construction of the loading device and the loading procedure are strongly influenced by the shape and size of the test specimen available (or in view to the goal of the investigation necessary) and by the mechanical properties of the material under consideration.
In this paper the development of an adequate testing device as well as a testing specimen is shown for the case of orthotropic wood. The goals of this investigation are the determination of the material strength and the biaxial stress-strain relationship of wood when loaded oblique to the grain direction.
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Published: September 30, 2000 Show citation
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References
- GINGERL, M.: Realisierung eines optischen Deformationsmeßsystems zur experimentellen Untersuchung des orthotropen Materialverhaltens von Holz bei biaxialer Beanspruchung, Ph. D. Thesis, Vienna University of Technology, 1998.
- MALVERN, L. E.: Introduction to the Mechanics of a Continous Medium, Series in Engineering of the Physical Sciences, Prentice-Hall, 1969.
- EBERHARDSTEINER, J.: Experimentelle Untersuchung mechanischer Eigenschaften von Fichtenholz bei biaxialer Beanspruchung schräg zur Faserrichtung, Habilitation, Vienna University of Technology, 2000, in print.
- EBERHARDSTEINER, J.: Biaxial testing of orthotropic materials using electronic speckle pattern interferomtery, Measurement 16, p. 139-148, 1995.
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