RT Journal Article ID 5c5aae1d6e297674 A1 Regueiro, Richard A. A1 Duan, Zheng A1 Wang, Wei A1 Sweetser, John D. A1 Jensen, Erik W. T1 GENERAL FORMULATION OF A POROMECHANICAL COHESIVE SURFACE ELEMENT WITH ELASTOPLASTICITY FOR MODELING INTERFACES IN FLUID-SATURATED GEOMATERIALS JF International Journal for Multiscale Computational Engineering JO JMC YR 2016 FD 2016-11-07 VO 14 IS 4 SP 323 OP 347 K1 poromechanics K1 fluid-saturated K1 cohesive surface element (CSE) K1 elastoplasticity K1 nonlinear finite element K1 interfaces K1 geomaterials AB The paper formulates and implements a fluid-saturated poromechanical cohesive surface element (CSE) based upon biphasic (solid-fluid) mixture theory at small strain, with strong discontinuity kinematics. The goal is to be able to introduce strong discontinuity kinematics directly into the coupled variational form in order to derive the balance of linear momentum and mass within the discontinuity domain. This method is compared to approaches that derive the additional terms directly from underlying physical considerations. This approach is useful when extending the method to finite strain, partially saturated, and heated conditions. The Strong form (coupled partial differential equations) is presented, upon which Weak and Galerkin forms are formulated using different representations of the fields outside and inside the discontinuity domain. A mixed Q6P4 six-noded CSE is implemented within the coupled nonlinear Finite Element (FE) equations, along with a mixed Q9P4 biquadratic/bilinear quadrilateral for the surrounding bulk porous continuum. Numerical examples demonstrate the features of the CSE for fluid-saturated geomaterials. PB Begell House LK https://www.dl.begellhouse.com/journals/61fd1b191cf7e96f,2b8c00292c2d9c29,5c5aae1d6e297674.html