OGS
griffith.prj
<OpenGeoSysProject>
  <mesh>griffith_quad.vtu</mesh>
  <geometry>griffith.gml</geometry>
  <search_length_algorithm>
    <type>fixed</type>
    <value>1e-4</value>
  </search_length_algorithm>
  <processes>
    <process>
      <name>SD</name>
      <type>SMALL_DEFORMATION_NONLOCAL</type>
      <integration_order>4</integration_order>
      <constitutive_relation>
        <type>Ehlers</type>
        <shear_modulus>G</shear_modulus>
        <bulk_modulus>K</bulk_modulus>
        <kappa>kappa</kappa>
        <beta>beta</beta>
        <gamma>gamma</gamma>
        <hardening_modulus>hard</hardening_modulus>
        <alpha>alpha</alpha>
        <delta>delta</delta>
        <eps>epsilon</eps>
        <m>m</m>
        <alphap>alphap</alphap>
        <deltap>deltap</deltap>
        <epsp>epsilonp</epsp>
        <mp>mp</mp>
        <betap>betap</betap>
        <gammap>gammap</gammap>
        <tangent_type>Plastic</tangent_type>
        <damage_properties>
          <alpha_d>alphad</alpha_d>
          <beta_d>betad</beta_d>
          <h_d>hd</h_d>
        </damage_properties>
        <nonlinear_solver>
          <maximum_iterations>100</maximum_iterations>
          <residuum_tolerance>1e-10</residuum_tolerance>
          <increment_tolerance>0</increment_tolerance>
        </nonlinear_solver>
      </constitutive_relation>
      <solid_density>rho_sr</solid_density>
      <specific_body_force>0 0</specific_body_force>
      <internal_length>0.01e-6</internal_length>
      <process_variables>
        <process_variable>displacement</process_variable>
      </process_variables>
      <secondary_variables>
        <secondary_variable internal_name="damage" output_name="damage" />
        <secondary_variable internal_name="sigma" output_name="sigma" />
        <secondary_variable internal_name="epsilon" output_name="epsilon" />
      </secondary_variables>
    </process>
  </processes>
  <time_loop>
    <processes>
      <process ref="SD">
        <nonlinear_solver>basic_newton</nonlinear_solver>
        <convergence_criterion>
          <type>DeltaX</type>
          <norm_type>NORM2</norm_type>
          <abstol>1e-6</abstol>
        </convergence_criterion>
        <time_discretization>
          <type>BackwardEuler</type>
        </time_discretization>
        <time_stepping>
          <type>FixedTimeStepping</type>
          <t_initial>0</t_initial>
          <t_end>1</t_end>
          <timesteps>
            <pair>
              <repeat>1000000</repeat>
              <delta_t>0.05</delta_t>
            </pair>
          </timesteps>
        </time_stepping>
      </process>
    </processes>
    <output>
      <type>VTK</type>
      <prefix>out_crack</prefix>
      <timesteps>
        <pair>
          <repeat>10000</repeat>
          <each_steps>1</each_steps>
        </pair>
      </timesteps>
      <variables>
        <variable>displacement</variable>
        <variable>damage</variable>
        <variable>sigma</variable>
        <variable>epsilon</variable>
      </variables>
      <suffix>ts{:timestep}_t_{:time}</suffix>
    </output>
  </time_loop>
  <parameters>
    <parameter>
      <name>G</name>
      <type>Constant</type>
      <value>34.78e9</value>
    </parameter>
    <parameter>
      <name>K</name>
      <type>Constant</type>
      <value>38.10e9</value>
    </parameter>
    <parameter>
      <name>kappa</name>
      <type>MeshElement</type>
      <field_name>strength</field_name>
    </parameter>
    <parameter>
      <name>beta</name>
      <type>Constant</type>
      <value>0.47</value>
    </parameter>
    <parameter>
      <name>gamma</name>
      <type>Constant</type>
      <value>0.</value>
    </parameter>
    <parameter>
      <name>hard</name>
      <type>Constant</type>
      <value>0.0</value>
    </parameter>
    <parameter>
      <name>alpha</name>
      <type>Constant</type>
      <value>0.0</value>
    </parameter>
    <parameter>
      <name>delta</name>
      <type>Constant</type>
      <value>0.0</value>
    </parameter>
    <parameter>
      <name>epsilon</name>
      <type>Constant</type>
      <value>0.</value>
    </parameter>
    <parameter>
      <name>m</name>
      <type>Constant</type>
      <value>0.0</value>
    </parameter>
    <parameter>
      <name>alphap</name>
      <type>Constant</type>
      <value>0.0</value>
    </parameter>
    <parameter>
      <name>deltap</name>
      <type>Constant</type>
      <value>0.</value>
    </parameter>
    <parameter>
      <name>epsilonp</name>
      <type>Constant</type>
      <value>0.</value>
    </parameter>
    <parameter>
      <name>mp</name>
      <type>Constant</type>
      <value>0.0</value>
    </parameter>
    <parameter>
      <name>betap</name>
      <type>Constant</type>
      <value>0.47</value>
    </parameter>
    <parameter>
      <name>gammap</name>
      <type>Constant</type>
      <value>0.</value>
    </parameter>
    <parameter>
      <name>alphad</name>
      <type>Constant</type>
      <value>0.0001</value>
    </parameter>
    <parameter>
      <name>betad</name>
      <type>Constant</type>
      <value>0.001</value>
    </parameter>
    <parameter>
      <name>hd</name>
      <type>Constant</type>
      <value>0.0</value>
    </parameter>
    <parameter>
      <name>displacement0</name>
      <type>Constant</type>
      <values>0 0</values>
    </parameter>
    <parameter>
      <name>Dirichlet_0</name>
      <type>Constant</type>
      <value>0.</value>
    </parameter>
    <parameter>
      <name>Dirichlet_load</name>
      <type>Constant</type>
      <value>1.</value>
    </parameter>
    <parameter>
      <name>Dirichlet_top_y</name>
      <type>CurveScaled</type>
      <curve>Dirichlet_top_time</curve>
      <parameter>Dirichlet_load</parameter>
    </parameter>
    <parameter>
      <name>rho_sr</name>
      <type>Constant</type>
      <value>1</value>
    </parameter>
  </parameters>
  <curves>
    <curve>
      <name>Dirichlet_top_time</name>
      <coords>0. 1.0</coords>
      <values>0. 0.0001</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>
          <geometrical_set>griffith</geometrical_set>
          <geometry>bottom</geometry>
          <type>Dirichlet</type>
          <component>1</component>
          <parameter>Dirichlet_0</parameter>
        </boundary_condition>
        <boundary_condition>
          <geometrical_set>griffith</geometrical_set>
          <geometry>p_0</geometry>
          <type>Dirichlet</type>
          <component>0</component>
          <parameter>Dirichlet_0</parameter>
        </boundary_condition>
        <boundary_condition>
          <geometrical_set>griffith</geometrical_set>
          <geometry>top</geometry>
          <type>Dirichlet</type>
          <component>1</component>
          <parameter>Dirichlet_top_y</parameter>
        </boundary_condition>
      </boundary_conditions>
    </process_variable>
  </process_variables>
  <nonlinear_solvers>
    <nonlinear_solver>
      <name>basic_newton</name>
      <type>Newton</type>
      <max_iter>10000</max_iter>
      <damping>1</damping>
      <linear_solver>general_linear_solver</linear_solver>
    </nonlinear_solver>
  </nonlinear_solvers>
  <linear_solvers>
    <linear_solver>
      <name>general_linear_solver</name>
      <eigen>
        <solver_type>SparseLU</solver_type>
        <scaling>1</scaling>
      </eigen>
    </linear_solver>
  </linear_solvers>
</OpenGeoSysProject>