( Instability in tensile test. See examples homepage. ) echo -no number_of_space_dimensions 2 materi_velocity materi_strain_total materi_strain_plasti materi_plasti_kappa materi_stress end_initia start_define left_edge geometry_line 1 end_define start_define lower_edge geometry_line 2 end_define start_define upper_edge geometry_line 3 end_define start_define instability_point geometry_point 1 end_define left_edge 0 0 0 5 1.e-5 lower_edge 0 0 1 0 1.e-5 upper_edge 0 5 1 5 1.e-5 instability_point 1 0 1.e-5 bounda_unknown 1 -lower_edge -vely bounda_time 1 0.0 0.0 100. 0.0 bounda_unknown 2 -left_edge -velx bounda_time 2 0.0 0.0 100. 0.0 bounda_unknown 3 -upper_edge -vely bounda_time 3 0.0 1.0 100. 1.0 group_type 0 -materi group_materi_elasti_young 0 210000. group_materi_elasti_poisson 0 0.33 group_materi_plasti_vonmises 0 0. group_materi_plasti_vonmises_nadai 0 600 0.21372e-3 0.01 group_materi_membrane 0 -yes post_node 1 -node_rhside -sum -upper_edge print_filter 1 -post_node_result 1 -vely control_mesh_macro 10 -rectangle 0 5 10 control_mesh_macro_parameters 10 0.5 2.5 1. 5. control_mesh_refine_globally 20 -p_refinement (change coordinate of right edge point to trigger instability) control_data_put 30 -node -instability_point control_data_put_double 30 0.99 0. control_timestep 40 1.e-4 1. control_timestep_iterations_automatic 40 0.01 0.1 ( control_print 40 -time_current -dtime -post_node_rhside_ratio control_print_history 40 -post_node_result 1 -vely ) target_item 1 -post_node 1 -vely target_value 1 -641. 1.e2 end_data