FEBio Tutorial 2: Tensile Test

A rectangular box is constrained (fixed) at the one side and loading or displacement is applied to the other side.

Creating geometries

Select a rectangular box at Create tap of the Build panel and then click Parameters.

In the Parameters users can type Position (0, 0, 0) and Parameters (width == 4, height == 1, depth == 1) and click Create.

Or users can point a location at the Graphical view (see below). Click (1,0,1) at the Graphical view and the Position was changed in the Parameters panel.

You can also see the change at the Main view

Setting up the boundary conditions

As described above, the left side of the box will be constrained and displacement will be applied to the right side of the box.

Physics/Add Boundary Condition at the Main menu bar

or selecting Boundary conditions with the right mouse button at the Main viewer and click the Add Boundary condition.

1. Can see a Boundary Conditions in the Model viewer.

2. To apply constraints for x, y, and z degree of freedom, check the x, y, and z in the Properties panel

3. Because we will apply BC to the left side surface of the box, clicking Selecting Surfaces icon in the selecting toolbox.

4. Rotating the box with the left mouse button in the Graphical view and selecting the left side surface of the box.

5. Click the cross button in the Selection panel.

* In the Selection panel,

minus sign: subtracting objects currently selected objects in the Graphical view form the list.

X sign: removing all selected objects/

Arrow sign: showing the selected object in the list at the Graphical view

Repeat the boundary conditions of the right side of the box to apply a displacement in the x-direction.

1. Add Boundary Condition.

2. Select Fixed displacement.

3. Select Y and Z displacement (X-displacement is free to move).

4. Select the right side surface of the box.

5. Add surface to the Selection.

6. Applying Prescribed displacement.

7. Select X-displacement for Degree of freedom and scale 1 and add the right surface of the box.

Creating and assigning materials

A Mooney-Rivlin* material will be used for this model.

Mooney-Rivlin model (Please see the details in the follow link https://www.continuummechanics.org/mooneyrivlin.html)

It is popular for modeling a rubble that has the large strain nonlinear behavior of incompressible material.

There are three ways to add a material.

1. Using the Menu bar: Physics/Add Material.

2. Mouse right click of the Materials at the Main viewer.

3. Click the shortcut of the Material at the Main toolbar.

Steps for assigning Materials

1. After adding Material.

2. Select uncoupled elastic in the Add Material window.

3. Select Mooney-Rivlin.

4. Assigning coefficients.

5. Selecting a part from the Selection toolbox using the Selecting Part tool.

6. Add the selected part.

Creating the mesh

1. Select the box with Select Objects toolbox.

2. Applying Mesh Parameters (Nx=20, Ny=5, Nz=5).

3. Click Show Mesh Lines in the Main toolbar.

Create Step for analysis

Creating an analysis step to define the type of analysis.

In the Main menu bar click Physics/Add Step or right-click the Steps in the Model view

And click the Add Analysis Step.

Select an analysis type of Structural Mechanics.

A New Step is generated.

You can see Properties of Step. This tutorial is using the default setting.

Save the model.

Running the model of tutorial 2.

Click Run FEBio shortcut icon in the Main toolbar or Clock Tools/FEBio/Run FEBio.

The following window shows up and Click Run.

After completing the simulation Normal termination window is popped up.

To see the result contour plot Click Open in FEBio Studio in the Properties panel.

The Color Map is showing up under Job1.

Visualization and animation are available at the top Main toolbox.

Play, forward, and backward are shown with the time step increment (1/11).

The result contour plot is at the right end of the main toolbox.

Select stress/Effective stress and you can see the effective stress result with the deformed shape.

Reference

Tutorial 2 from https://help.febio.org/PreView/PreView_2_1/index.html