|  | OGS
    | 
 <OpenGeoSysProject>
   <meshes>
     <mesh>shear.vtu</mesh>
     <mesh>shear_bottom.vtu</mesh>
     <mesh>shear_top.vtu</mesh>
     <mesh>shear_left.vtu</mesh>
     <mesh>shear_right.vtu</mesh>
   </meshes>
   <processes>
     <process>
       <name>PhaseField</name>
       <type>PHASE_FIELD</type>
       <coupling_scheme>staggered</coupling_scheme>
       <integration_order>2</integration_order>
       <phasefield_model>AT2</phasefield_model>
       <energy_split_model>OrthoVolDev</energy_split_model>
       <irreversible_threshold>0.05</irreversible_threshold>
       <constitutive_relation>
         <type>LinearElasticOrthotropic</type>
         <youngs_moduli>E</youngs_moduli>
         <poissons_ratios>nu</poissons_ratios>
         <shear_moduli>G</shear_moduli>
       </constitutive_relation>
       <phasefield_parameters>
         <residual_stiffness>k</residual_stiffness>
         <crack_resistance>gc</crack_resistance>
         <crack_length_scale>ls</crack_length_scale>
       </phasefield_parameters>
       <solid_density>rho_sr</solid_density>
       <process_variables>
         <phasefield>phasefield</phasefield>
         <displacement>displacement</displacement>
       </process_variables>
       <secondary_variables>
         <secondary_variable internal_name="sigma" output_name="sigma" type="static" />
         <secondary_variable internal_name="sigma_tensile" output_name="sigma_tensile" type="static" />
         <secondary_variable internal_name="epsilon" output_name="epsilon" type="static" />
         <secondary_variable internal_name="eps_tensile" output_name="eps_tensile" type="static" />
         <secondary_variable internal_name="sigma_compressive" output_name="sigma_compressive" type="static" />
       </secondary_variables>
       <specific_body_force>0 0</specific_body_force>
     </process>
   </processes>
   <time_loop>
     <global_process_coupling>
       <max_iter>10000</max_iter>
       <convergence_criteria>
         <convergence_criterion>
           <type>DeltaX</type>
           <norm_type>NORM2</norm_type>
           <abstol>1.e-1</abstol>
           <reltol>1.e-1</reltol>
         </convergence_criterion>
         <convergence_criterion>
           <type>DeltaX</type>
           <norm_type>INFINITY_N</norm_type>
           <abstol>1.e-4</abstol>
           <reltol>1.e-10</reltol>
         </convergence_criterion>
       </convergence_criteria>
     </global_process_coupling>
     <processes>
       <process ref="PhaseField">
         <nonlinear_solver>basic_newton_u</nonlinear_solver>
         <convergence_criterion>
           <type>DeltaX</type>
           <norm_type>NORM2</norm_type>
           <reltol>1.e-12</reltol>
         </convergence_criterion>
         <time_discretization>
           <type>BackwardEuler</type>
         </time_discretization>
         <time_stepping>
           <type>FixedTimeStepping</type>
           <t_initial>0</t_initial>
           <t_end>1.0</t_end>
           <timesteps>
             <pair>
               <repeat>10</repeat>
               <delta_t>0.01</delta_t>
             </pair>
             <pair>
               <repeat>1</repeat>
               <delta_t>0.0001</delta_t>
             </pair>
           </timesteps>
         </time_stepping>
       </process>
       <process ref="PhaseField">
         <nonlinear_solver>petsc_snes</nonlinear_solver>
         <convergence_criterion>
           <type>DeltaX</type>
           <norm_type>NORM2</norm_type>
           <reltol>1.e-14</reltol>
         </convergence_criterion>
         <time_discretization>
           <type>BackwardEuler</type>
         </time_discretization>
         <time_stepping>
           <type>FixedTimeStepping</type>
           <t_initial>0</t_initial>
           <t_end>1.0</t_end>
           <timesteps>
             <pair>
               <repeat>10</repeat>
               <delta_t>0.01</delta_t>
             </pair>
             <pair>
               <repeat>1</repeat>
               <delta_t>0.0001</delta_t>
             </pair>
           </timesteps>
         </time_stepping>
       </process>
     </processes>
     <output>
       <variables>
         <variable>displacement</variable>
         <variable>phasefield</variable>
         <variable>sigma</variable>
         <variable>sigma_tensile</variable>
         <variable>epsilon</variable>
         <variable>epsilon_tensile</variable>
         <variable>NodalForces</variable>
         <variable>bulk_node_ids</variable>
         <variable>bulk_element_ids</variable>
       </variables>
       <type>VTK</type>
       <prefix>shear_deg_0</prefix>
       <timesteps>
         <pair>
           <repeat>100</repeat>
           <each_steps>1</each_steps>
         </pair>
         <pair>
           <repeat>10</repeat>
           <each_steps>1</each_steps>
         </pair>
       </timesteps>
     </output>
   </time_loop>
   <local_coordinate_system>
     <basis_vector_0>e0</basis_vector_0>
     <basis_vector_1>e1</basis_vector_1>
   </local_coordinate_system>
   <parameters>
     <parameter>
       <name>E</name>
       <type>Constant</type>
       <values>6.0e9 13.8e9 13.8e9</values>
     </parameter>
     <parameter>
       <name>nu</name>
       <type>Constant</type>
       <values>0.22 0.44 0.22</values>
     </parameter>
     <parameter>
       <name>G</name>
       <type>Constant</type>
       <values>3.2e9 1.6e9 3.2e9</values>
     </parameter>
     <parameter>
       <name>gc</name>
       <type>Constant</type>
       <value>0.5</value>
     </parameter>
     <parameter>
       <name>e0</name>
       <type>Constant</type>
       <values>1.0 0.0</values>
     </parameter>
     <parameter>
       <name>e1</name>
       <type>Constant</type>
       <values>0.0 1.0</values>
     </parameter>
     <parameter>
       <name>k</name>
       <type>Constant</type>
       <value>1e-8</value>
     </parameter>
     <parameter>
       <name>ls</name>
       <type>Constant</type>
       <value>1.e-4</value>
     </parameter>
     <parameter>
       <name>rho_sr</name>
       <type>Constant</type>
       <value>0.0</value>
     </parameter>
     <parameter>
       <name>displacement0</name>
       <type>Constant</type>
       <values>0 0</values>
     </parameter>
     <parameter>
       <name>phasefield_ic</name>
       <type>Constant</type>
       <value>1</value>
     </parameter>
     <parameter>
       <name>phasefield_bc</name>
       <type>Constant</type>
       <value>1</value>
     </parameter>
     <parameter>
       <name>dirichlet0</name>
       <type>Constant</type>
       <value>0</value>
     </parameter>
     <parameter>
       <name>dirichlet_top</name>
       <type>Constant</type>
       <value>1.0e-6</value>
     </parameter>
     <parameter>
       <name>dirichlet_bottom</name>
       <type>Constant</type>
       <value>-1.0e-6</value>
     </parameter>
     <parameter>
       <name>dirichlet_top_time</name>
       <type>CurveScaled</type>
       <curve>dirichlet_time</curve>
       <parameter>dirichlet_top</parameter>
     </parameter>
     <parameter>
       <name>dirichlet_bottom_time</name>
       <type>CurveScaled</type>
       <curve>dirichlet_time</curve>
       <parameter>dirichlet_bottom</parameter>
     </parameter>
   </parameters>
   <curves>
     <curve>
       <name>dirichlet_time</name>
       <coords>0 1.0</coords>
       <values>0 1.0</values>
     </curve>
   </curves>
   <process_variables>
     <process_variable>
       <name>displacement</name>
       <components>2</components>
       <order>1</order>
       <initial_condition>displacement0</initial_condition>
       <boundary_conditions>
         <boundary_condition>
           <mesh>shear_bottom</mesh>
           <type>Dirichlet</type>
           <component>1</component>
           <parameter>dirichlet0</parameter>
         </boundary_condition>
         <boundary_condition>
           <mesh>shear_bottom</mesh>
           <type>Dirichlet</type>
           <component>0</component>
           <parameter>dirichlet0</parameter>
         </boundary_condition>
         <boundary_condition>
           <mesh>shear_top</mesh>
           <type>Dirichlet</type>
           <component>0</component>
           <parameter>dirichlet_top_time</parameter>
         </boundary_condition>
         <boundary_condition>
           <mesh>shear_top</mesh>
           <type>Dirichlet</type>
           <component>1</component>
           <parameter>dirichlet0</parameter>
         </boundary_condition>
       </boundary_conditions>
     </process_variable>
     <process_variable>
       <name>phasefield</name>
       <components>1</components>
       <order>1</order>
       <initial_condition>phasefield_ic</initial_condition>
       <boundary_conditions>
         <boundary_condition>
           <mesh>shear_top</mesh>
           <type>Dirichlet</type>
           <component>0</component>
           <parameter>phasefield_bc</parameter>
         </boundary_condition>
         <boundary_condition>
           <mesh>shear_bottom</mesh>
           <type>Dirichlet</type>
           <component>0</component>
           <parameter>phasefield_bc</parameter>
         </boundary_condition>
       </boundary_conditions>
     </process_variable>
   </process_variables>
   <nonlinear_solvers>
     <nonlinear_solver>
       <name>petsc_snes</name>
       <type>PETScSNES</type>
       <max_iter>50</max_iter>
       <linear_solver>linear_solver_d</linear_solver>
     </nonlinear_solver>
     <nonlinear_solver>
       <name>basic_newton_u</name>
       <type>Newton</type>
       <max_iter>200</max_iter>
       <linear_solver>linear_solver_u</linear_solver>
     </nonlinear_solver>
   </nonlinear_solvers>
   <linear_solvers>
     <linear_solver>
       <name>linear_solver_d</name>
       <eigen>
         <solver_type>BiCGSTAB</solver_type>
         <precon_type>ILUT</precon_type>
         <max_iteration_step>10000</max_iteration_step>
         <error_tolerance>1e-16</error_tolerance>
       </eigen>
       <petsc>
         <parameters>-ksp_type cg -pc_type bjacobi -ksp_atol 1e-10 -ksp_rtol 1e-8 -snes_type vinewtonrsls -snes_linesearch_type l2 -snes_atol 1.e-6 -snes_rtol 1.e-6 -snes_max_it 1000 -snes_monitor</parameters>
       </petsc>
     </linear_solver>
     <linear_solver>
       <name>linear_solver_u</name>
       <petsc>
         <prefix>u</prefix>
         <parameters>-u_ksp_type cg -u_pc_type hypre -u_pc_hypre_type boomeramg -u_pc_hypre_boomeramg_strong_threshold 0.7 -u_ksp_atol 1e-16 -u_ksp_rtol 1e-6</parameters>
       </petsc>
     </linear_solver>
   </linear_solvers>
 </OpenGeoSysProject>