Mechanical stability of arbitrarily loaded crystals of any symmetry reduces to checking that all Kelvin moduli of a stress-modified stiffness matrix in Mandel notation are positive.
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Mechanical stability conditions for 3D and 2D crystals under arbitrary load
Mechanical stability of arbitrarily loaded crystals of any symmetry reduces to checking that all Kelvin moduli of a stress-modified stiffness matrix in Mandel notation are positive.