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In FEM, which method is not used to construct the weak forms and associated finite element model of the plane elasticity equations?

In FEM, which method is not used to construct the weak forms and associated finite element model of the plane elasticity equations? Correct Answer Hamiltonian principle

There are two different ways of constructing the weak forms and associated finite element model of the plane elasticity equations. The first one uses the principle of virtual displacements (or the principle of minimum total potential energy), while the second approach follows a three-step procedure to obtain a weak form of governing differential equations.

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