A mixed-enhanced formulation tetrahedral finite elements

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Mullins effect and cyclic stress softening of filled elastomers by internal sliding and friction thermodynamics model (2009, methodology): “To eliminate the locking phenomena inherent to the displacement-based formulation, a mixed displacement–pressure formulation can be used (Simo et al., 1985; Taylor, 2000).”
Formulation of a dynamic material point method (MPM) for geomechanical problems (2013, background): “17: Illustration of locking with 3-noded triangular elements of enhanced strain fields such as bubble functions [170].”
An edge-based smoothed tetrahedron finite element method (ES-T-FEM) for 3D static and dynamic problems (2013, methodology): “Other approaches in the frame of FEM were also proposed such as stabilization by employing finite element approximations enriched with so-called “bubble” functions [16], stabilization by adding mesh-dependent perturbation terms [17], stabilized mixed formulation [17–19], mixed-enhanced strain stabil”
Computational method of inverse elastostatics for anisotropic hyperelastic solids (2007, methodology): “See also Reference [9].”