For the following stress matrix, the first invariant of the stress tensor is the trace of a matrix, the sum of diagonal element: I₁ = ₁₁ + ₂₂ + ₃₃. The second invariant of matrix is equal to _________
( begin{vmatrix} sigma_{11} & sigma_{12} & sigma_{13} sigma_{21}& sigma_{22} & sigma_{23} sigma_{31}& sigma_{32} & sigma_{33} end{vmatrix} )

Question

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NA

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Sum of all the elements of the matrix

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Sum of first column elements

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Sum of first raw elements

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Sum of all the principal minors of the matrix

1.	For the following stress matrix, the first invariant of the stress tensor is the trace of a matrix, the sum of diagonal element: I₁ = ₁₁ + ₂₂ + ₃₃. The second invariant of matrix is equal to _________ ( begin{vmatrix} sigma_{11} & sigma_{12} & sigma_{13} sigma_{21}& sigma_{22} & sigma_{23} sigma_{31}& sigma_{32} & sigma_{33} end{vmatrix} )
A.	Sum of all the elements of the matrix
B.	Sum of first column elements
C.	Sum of first raw elements
D.	Sum of all the principal minors of the matrix
Answer» E.

Discussion