For the general case of a stress state, the necessary and sufficient conditions have been strictly derived. These conditions should be satisfied by undetermined coefficients of quadratic strength criteria for orthotropic materials, so that the limiting quadric hypersurface of strength in the six-dimensional space of stresses has a physical meaning.
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Translated from Problemy Prochnosti, No. 1, pp. 72 – 79, January – February, 2014.
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Romashchenko, V.A. On Six-Dimensional Quadric Hyperspace of Strength for Orthotropic Materials. Strength Mater 46, 57–63 (2014). https://doi.org/10.1007/s11223-014-9515-0
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DOI: https://doi.org/10.1007/s11223-014-9515-0