Either memory_type should be set to -updated, -updated_without_rotation, -total, -total_piola or -total_linear. See the theoretical part for some explanation.
For a simple linear total Lagrange solid the input file may look like
...
materi_velocity
materi_displacement
materi_strain_total
materi_stress
end_initia
...
group_materi_memory 0 -total_linear
group_materi_elasti_young 0 ...
...
end_data
For a large deformation total Lagrange solid with a straightforward decomposition of the deformation tensor into a rotation tensor and a stretch tensor the input file may look like
...
materi_velocity
materi_displacement
materi_strain_total
materi_stress
end_initia
...
group_materi_memory 0 -total
group_materi_elasti_young 0 ...
...
end_data
For a large deformation total Lagrange solid with Piola-Kirchoff stresses and Green-Lagrange strains the input file may look like
...
materi_velocity
materi_displacement
materi_strain_total
materi_stress
end_initia
...
group_materi_memory 0 -total_piola
group_materi_elasti_young 0 ...
...
end_data
For an updated Lagrange solid the input file may look like
...
materi_velocity
materi_strain_total
materi_stress
end_initia
...
node 1 ...
node 2 ...
...
(use -updated_without_rotation to neglect rigid body rotation)
group_materi_memory 0 -updated
group_materi_elasti_young 0 ...
...
end_data
For a fluid the input file may look like
...
materi_velocity
materi_stress
end_initia
...
(use eulerian mesh)
options_mesh -fixed_in_space
...
node 1 ...
node 2 ...
...
group_materi_memory 0 -updated_without_rotation
group_materi_viscosity 0 ...
group_materi_elasti_compressibility 0 ...
...
end_data
The index specifies the element_group, see element_group.