( Von mises plasticity test.
  Two-dimensional.
  First stretching, second compression.
  Target: sigyy = -3.333333
  See: Fundamental Tests for two and three dimensional,
  small strain, elastoplastic finite element analysis,
  E. Hinton, M. Ezatt, 1987, NAFEMS report )

echo -no
number_of_space_dimensions 2
materi_velocity
materi_strain_plasti
materi_strain_total
materi_stress
end_initia

node 1  0 0 
node 2  1 0
node 3  0 1
node 4  1 1
element 1  -quad4 1 2 3 4

bounda_unknown 0  -ra 1 2 -ra -vely
bounda_time    0  0.0 0. 100. 0.
bounda_unknown 1  -ra 3 4 -ra -vely
bounda_time    1  0.0 0.  0.01e-5 1.  5.00e-5 1.  5.01e-5 -1.  1.00e-4 -1.

bounda_unknown 2  -all -velx
bounda_time    2  0.0 0. 100. 0.

group_type 0  -materi
group_materi_density 0  1.0
group_materi_elasti_young 0 250000.
group_materi_elasti_poisson 0  0.25
group_materi_memory 0  -updated_without_rotation
group_materi_plasti_vonmises 0  5.

print_filter 0  -node_dof -all -vely -sigyy

control_timestep 0  0.25e-5 1.0e-4
(control_print    0  -time_current -node_dof)

target_item  0  -node_dof 1 -sigyy
target_value 0  -3.3333333 1.e-2
end_data
