Description: You can define a fluid constitutive response based on tangential flow within the gap as a cohesive element opens. If tangential flow is present, you can also define normal flow across the gap. Figure 8–4 illustrates the two flow types within cohesive elements.

The tangential flow, or gap flow, can be defined using either a Newtonian or a power law model. The normal flow, if used, is defined using a fluid leakoff coefficient to describe flow through a permeable layer. Both types of flow are defined in conjunction with a pore fluid material definition. Figure 8–5 shows the ABAQUS/CAE material editor for a power law pore fluid.

To use pore pressure cohesive elements in an ABAQUS/CAE model, you must mesh the model using cohesive elements and then use the keyword editor to append a “P” to the selected element type and add the offset number. For example, if you create a mesh using the cohesive element COH2D4, the input file contains the following line:

*ELEMENT, type=COH2D4

*ELEMENT, type=COH2D4P, offset= n

Property module:
   MaterialCreate: OtherPore FluidGap Flow or Fluid Leakoff: Select the options and enter the data   to define the desired flow properties.
Mesh module:
   MeshElement Type: Standard: Family: Cohesive: ModelEdit Keywords