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Nonconforming mixed elements for elasticity
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DOI：10.1142/S0218202503002507.png)
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Abstract
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We construct first-order, stable, nonconforming mixed finite elements for plane elasticity and analyze their convergence. The mixed method is based on the Hellinger-Reissner variational formulation in which the stress and displacement fields are the primary unknowns. The stress elements use polynomial shape functions but do not involve vertex degrees of freedom.
Keywords:
mixed method
nonconforming finite element
elasticity
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