area_element_group_sequence_elementgroup index group_0 group_1 ...

This options works more or less the same as the area_element_group option. Read that description first.

With this option however, you can specify what the element group numbers of an area (geometry) will be in time. This allows for an easy modelling of change of material models inside a geometry (that is, inside the elements of that geometry).

This option works in combination with the area_element_group_sequence_element etc. records (with the same index).

With area_element_group_sequence_geometry you select the area (geometry) for which the time sequence of group numbers should be used.

With area_element_group_sequence you select the elements which the time sequence of group numbers should be used.

You can use both area_element_group_sequence_geometry and area_element_group_sequence to select a combination of elements in a geometry and directly specified element numbers.

With area_element_group_sequence_time and area_element_group_sequence_elementgroup you select time points at which groups should become active; by example, group_0 becomes active at time_0 etc.

With area_element_group_sequence_element you select the name of the elements for which the sequence of time versus group will be used; if this area_element_group_sequence_element is not specified then all elements in the area (geometry) will be used.

Remark 1: If you want the stresses, strains, etc. to be reset to 0. when the element group changes, then use a control_unknown_reset_geometry record for that.

Remark 2: It is more convenient and clear to use the start_define end_define option to define the geometries.

Example:

area_element_group_sequence_geometry 0 -geometry_brick 1
area_element_group_sequence_element 0 -hex8
area_element_group_sequence_time 0 0. 2. 3.
area_element_group_sequence_elementgroup 0 1 5 4

group_type 1 ...
...
group_type 5 ...
...
group_type 4 ...
...
control_unknown_reset_geometry 10 -geometry_brick 1
...

In the selected geometry element group 1 will be used starting from time 0 for elements -hex8. Starting from time 2 element group 5 will be used, etc.

Same example, now with define's however:

start_define
soil_empty_wall geometry_brick 1
end_define
...

area_element_group_sequence_geometry 0 -soil_empty_wall
area_element_group_sequence_element 0 -hex8
area_element_group_sequence_time 0 0. 2. 3.
area_element_group_sequence_elementgroup 0 1 5 4

group_type 1 ...
...
group_type 5 ...
...
group_type 4 ...
...
control_unknown_reset_geometry 10 -soil_empty_wall
...