Download getting started with crisp2d

A GUIDE TO THE ADVANCED FEATURES OF CRISP2D
and, providing the offset percentage is large enough, the elements can then be selected by clicking inside
them in the usual way.
Creating Interface Elements
See page 4-15 for
further details about
deleting interface
elements
Tip
Before you begin creating interface elements you should be satisfied that your finite element mesh
is complete. This is because deleting interface elements once they have been created causes ‘gaps’
to open up in the mesh which need to be manually closed.
It is strongly recommended that you save your Project as a Bookmark just
before you start creating interface elements. If there are any problems, the data
already input has been saved and you can carry on with your file generation at
the point immediately prior to slip element creation.
Interface elements are created by selecting one or more domain finite elements around which you wish to
place the interface layer. The elements are then created by clicking on Create Slip Element in the Mesh
menu. This causes a new row of edges to be generated around the internal boundaries of the selected
elements.
The figure above shows how a layer of interface elements is created. The left-hand diagram shows a cut-out
finite element mesh highlighting the elements around which an interface is to be created. In this case, a
group of four domain elements has been selected to model, for instance, a soil-retaining wall interaction.
The numbers refer to edge numbers.
When the interface layer is created, the situation becomes that depicted in the right-hand diagram. In this,
the newly created interface elements are highlighted. New nodes and edges (here shown as edge numbers
52-64) are created and the elements originally selected are automatically re-connected so as to include these
new edges. Note that the only connectivity changes that occur are for the originally selected elements; as
far as the rest of the mesh is concerned, there is no apparent change in numbering.
Interface layers may only be created around groups of adjacent line or domain elements. If you have two
structures separated by soil, the interface elements must be created for each structure separately, not at the
same time.
Deleting Interface Elements
Interface elements may be deleted by selecting them and clicking on Delete Selection in the edit menu.
4-15