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Table 1 Eigenmodes for eigenvalues 11–15 of the square element

From: An improved quadrilateral shell element based on the Hu–Washizu functional

EV-no.

\({\varvec{n}}={\mathbf 0} \)

\({\varvec{n}}={\mathbf 7} \)

\({\varvec{n}}={\mathbf 11} \)

\({\varvec{n}}={\mathbf 11} \, ({\varvec{c}}={\mathbf 0} )\)

12

B1

B1

M1

B1

13

B2

B2

M2

M1

14

M2

M2

B1

M2

15

M1

M1

B2

B2