A locking free hp DPG method for linear elasticity with symmetric   stresses
  We present two new methods for linear elasticity with simultaneously yield stress and displacement approximations of optimal accuracy in both the mesh size h and polynomial degree p. This is achieved within the recently developed discontinuous Petrov-Galerkin (DPG) framework. In this framework, both the stress and the displacement approximations are discontinuous across element interfaces. We study locking-free convergence properties and the interrelationships between the two DPG methods. 
Jamie Bramwell, Leszek Demkowicz, Jay Gopalakrishnan, Weifeng Qiu
math.NA math.AP