17.4.6. Inputs for Residual Stresses and Deformations

If you simulate a non-isothermal problem with a nonuniform temperature field, you can compute the residual stresses and deformations generated by the temperature field at ambient temperature. The procedure for setting up the calculation of the residual deformations and stresses is as follows:

  1. Create a new steady task.

      Create a new task

  2. Create a sub-task.

      Create a sub-task

    1. Select Linear Thermo-Elastic stresses and deformations as the sub-task type.

        Linear Thermo-Elastic stresses and deformations

    2. When prompted, enter a name for this sub-task.

    3. Specify the domain where compute the residual stresses and deformation.

        Domain of the sub-task

    4. Specify the elastic data in the Material data menu.

        Material data

        Elastic data

      1. Specify the value of the Young’s modulus.

          Modify Eo

      2. Specify the Poisson’s ratio.

          Modify MUo

        Important:  Note that while Poisson’s ratio is referred to as MU in the previous menu item, it is elsewhere denoted by (for example, Equation 27–2).

      3. Specify the lineic dilatation coefficient.

          Modify Bo

        Important:  This is also commonly known as the coefficient of linear dilation. Its units are 1/K (where K = degree Kelvin).

      4. Specify the reference temperature for the dilatation. In this case, this reference temperature corresponds to the ambient temperature.

          Modify Tref

      5. You can choose whether or not you want to take into account the deformation of the mesh in the simulation. Specify your preference by clicking either Switch to [no update of coordinates] or Switch to [update of the coordinates].

          Switch to [no update of coordinates]

        or

          Switch to [no update of coordinates]

        Important:  If the coordinates are updated, the problem becomes nonlinear and more than one iteration is required to reach convergence. In addition to this, an evolution may be defined on the lineic dilatation coefficient, in order to address nonlinearities originating from the geometry update.

    5. Specify the boundary conditions for the displacement. See Elasticity Boundary Conditions for more details about the boundary conditions for an elastic problem.

        Displacement boundary conditions

  3. Specify the numerical parameters.

      Numerical parameters

    1. Select the Start from an old result file menu item to initialize the temperature field.

        Start from an old result file

    2. When prompted, enter the name of the old result file.