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7.1.2 Fixed Shell Displacement
Certain shell element formulations used in FEBio have two sets of displacement degrees of freedom. One for the front-face of the shell, and one for the back face. The usual displacement degrees of freedom are used for the front-face of the shell, and the shell displacement degrees of freedom are used for the back-face of the shell. This boundary condition allows you to fix the back-face shell degrees of freedom.