Arnold, Douglas N.Winther, Ragnar2007-08-162007-08-162002-08https://hdl.handle.net/11299/3816We 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.