Abstract
We have seen (on p. 46) how the force transmitted in an arbitrary area element dA can be described in terms of the nine components σij of the stress tensor. We may ask whether, among all the area elements passing through a given point, one can find a special one for which the force σijdA i happens to be normal to the area on which it is acting. In that case the stress would be a simple tension or compression, not accompanied by a shear stress. The normal to such an area element and, hence, the direction of the stress in it, is called a principal direction or a principal axis of the stress tensor σij.
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© 1972 Springer-Verlag Berlin Heidelberg
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Flügge, W. (1972). Principal Axes and Invariants. In: Tensor Analysis and Continuum Mechanics. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-88382-8_11
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DOI: https://doi.org/10.1007/978-3-642-88382-8_11
Publisher Name: Springer, Berlin, Heidelberg
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