FEM EquationElasticity

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FEM EquationElasticity

Menu location
Solve → Elasticity equation
Workbenches
FEM
Default shortcut
None
Introduced in version
0.19
See also
FEM tutorial

Description

This equation describes the mechanical properties of rigid bodies.

Usage

  1. After adding an Elmer solver as described here, select it in the tree view.
  2. Now either use the toolbar button or the menu Solve → Elasticity equation.
  3. Change the special solver settings or the general solver settings if necessary.

Solver Settings

For the general solver settings, see the Elmer solver settings.

The elasticity equation provides these special settings:

  • DataCalculate Pangle:
  • DataCalculate Principal:
  • DataCalculate Strains:
  • DataCalculate Stresses:
  • DataDo Frequency Analysis:
  • DataEigenmodes Count:

Frequency Analysis

To perform a frequency analysis (calculation if the eigenmodes and eigenfrequencies), you need to

  1. Set DataDo Frequency Analysis: to true
  2. Set DataEigenmodes Cout: to the highest number of eigenmodes you are interested in. The smaller this number the shorter the solver runtime since higher modes can be omitted to be determined.
  3. Add a constraint fixed and set at least one face of the body as fixed.
  4. Accordingto the Elmer manual the best results for eigenmode analysis are obtained with direct solving. Therefore
    1. Set DataLinear Sover Type to Direct.
    2. Set DataLinear Direct Method to Umfpack.
  5. Eventually run the solver.