| 1. | The principal stresses are unique for a given stress tensor.
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| 2. | In terms of the principal stresses this is determined by the equation:
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| 3. | Mean stress is the time average of the principal stress.
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| 4. | The principal stresses of a stress tensor are its eigenvalues.
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| 5. | The von Mises yield criterion for pure shear stress, expressed in principal stresses, is
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| 6. | The geometric form of ( ) is that of a paraboloid in principal stress space.
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| 7. | These are the three eigenvalues of the stress tensor, which are called the principal stresses.
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| 8. | These solutions are the principal directions or eigenvectors defining the plane where the principal stresses act.
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| 9. | Figure 7 shows Drucker Prager yield surface in the three-dimensional space of principal stresses.
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| 10. | Figure 1 shows the Tresca Guest yield surface in the three-dimensional space of principal stresses.
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