9.4       Interface Surface Element

 

INTERFACE_SURFACE

 

 

            Element_name = INTERFACE_SURFACE, etc.

            m,   phi(m),   c(m)    < m = 1, numat >

                  < slaved nodes data >

                  < master elements connectivity data >

                  < exterior surfaces connectivity data >

 

 

 

9.4.1    Element Group Control Information

 

            Must follow the element name (same data record), and define the control parameters in the following form:

 

Note    Variable Name                                Type           Default         Description

 

            Number_of_slave_nodes               integer             [0]             Number of slave nodes

 

            Number_of_exterior_surfaces       integer             [0]             Number of exterior surfaces

 

            Analysis_type                                   list                [*]             Analysis type

                  two_dimensional

                  three_dimensional

 

 

 

9.4.2    Geometric / Material Properties Data (Numat sets)

 

Note          Variable           Default                  Description

 

                      M                    [0]                      Geometric/material set number

 

                  PHI(M)              [0.0]                    Friction angle (degrees)

 

                    C(M)                [0.0]                    Cohesion

 

 

 

9.4.3    Slaved Nodes Data

 

 

Note          Variable           Default                  Description

 

                       N                    [0]                      Node number  1 and   NUMNP

 

(1)                 NG                   [0]                      Generation increment

 

 

Notes/

 

(1)        Slaved nodal data can be generated by employing a two record sequence as follows:

 

Record 1: L,LG

Record 2: N,NG,

 

The nodes:

L+LG, L+2*LG,...,N-MOD(N-L,LG)

 

(i.e., less than N) are then defined as slaved.  If LG is blank or zero, no generation takes place between L and N.

 

 

9.4.4    Master Elements Nodal Connectivity Data

 

            Consult Chapter 11 for details; for this element NEN = 8 in three-dimensions, and NEN = 4 in two-dimensions.

 

 

9.4.5    Exterior Surfaces Nodal Connectivity Data

 

            Consult Chapter 11 for details; for this case NEN = 4 in three-dimensions, and NEN = 2 in two-dimensions.

 

 

References / Bibliography

 

1.      Belytschko, T. and Lin, J.I., “A three-dimensional impact-penetration algorithm with erosion”, Computers and Structures, 32, (1987), 95-104.

 

2.            Hallquist, J.O., “A procedure for the solution of finite-deformation contact-impact problems by the finite element method”, UCRL-52066, Lawrence Livermore Laboratory, Livermore, CA, (1976).

 

3.            Hallquist, J.O., “A numerical procedure for three dimensional impact problems”, Preprint 2956, ASCE, (October 1977).

 

4.            Hallquist, J.O., “A numerical treatment of sliding interfaces and impact”, Computational Techniques for Interface Problems, Eds K.C. Park and D.K. Gartling, ASME, NY, AMD 30, (1978).

 

 

Notes . .

 

 

 

Notes . .