The second tab on the GUI provides the cylinder definition page.  This page has two separate grid controls as shown in Figure 6 below.  The grid control on the left lists the radii for all the cylinder interfaces, starting with the inner radius.  A system of N cylinders with have N+1 interfaces.  The inner and outer interfaces are free-surfaces to which pressure boundary conditions can be applied.  All the other interfaces are bond interfaces that join the cylinders. 

The grid control on the right has the actual cylinder definitions.  Each cylinder definition requires only two input parameters: the material name and the stress-free temperature.  The cylinder definition grid control also displays the inner and outer radii for each cylinder as well as the cylinder mass.  The inner and outer radii for each cylinder are automatically determined from the interface radius list.  The mass per unit length of each cylinder is computed based on the material density.  Click on the figure below to show additional information about the cylinder dialog page. 

Figure 6.  Cylinder Definition Dialog Page