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What can one conclude about the displacement components ux and uy in the finite element model of the plane elasticity equations?

What can one conclude about the displacement components ux and uy in the finite element model of the plane elasticity equations? Correct Answer They are secondary variables and must be carried as primary nodal degrees of freedom

An examination of the weak form, 0=∫Ωehe\(dxdy-∫Ωehew1fxdxdy-∮┌dhew1txds reveals the following: (i) ux and uy are the primary variables, which must be carried as the primary nodal degrees of freedom. (ii) only first derivatives of ux and uywith respect to x and y, respectively, appear.

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