To start this tutorial, you have to import the tutorial project into your ‘Dashboard’ via the link above.
The CAD model
Once the workbench is open you will be in the ‘Geometries’ tab.
The CAD model named “Underrun Protection” is displayed in the viewer, as shown below.
You can interact with the CAD model as in a normal desktop application.
Create a Static Analysis
With the geometry selected, click on ‘Create Simulation’.
In our case we are interested in running a static stress analysis, so select the Static analysis option and press ‘Create Simulation’.
A new tree will be automatically generated in the left panel with all the parameters and settings that are necessary to completely specify such an analysis.
All parts that are completed are highlighted with a green check. Parts that need to be specified have a red circle. A blue circle indicates an optional setting that does not need to be filled out.
Create a mesh
As Finite Element analyses are carried out on discretized domains, we have to generate a Mesh for our CAD model.
Therefore as the next step select the Mesh option.
First order elements are used here.
Note that the results generated with First order elements might not be as accurate as with Second order elements. But choosing a Second order mesh will lead to longer computing times so is avoided here.
The mesh fineness will be coarse. As a rule of thumb, one should make sure that the resulting mesh does have more than one volume layer across the cross section of the model.
To start the meshing operation, hit the ‘Generate‘ button, highlighted in the figure below.
The resulting mesh is shown in figure below.
There is also a Meshing log available which provides quantitative information about the mesh.
Material selection and assignment
Next, assign a material to the solid. Click on ‘+’ next to ‘Materials’.
In the pop-up window, select ‘Steel’ and click on ‘Apply’. This loads the standard properties for steel.
Then, assign the material to the domain and save.
Now, we come to define the boundary conditions.
To create a boundary condition, click on the ‘+’ option next to ‘Boundary conditions’ and select the required boundary condition from drop down menu, as shown in the figure below.
We will start by constraining the displacement of the fixation holes.
For this, create a ‘Fixed Value‘ boundary condition from the drop down menu.
Set the displacement to zero in all directions.
Next, assign this boundary condition to the fixation holes.
Click on the blue checkmark to save this boundary condition.
The second boundary condition is the actual pressure load that acts on the shield of the underrun protection.
Choose a ‘Pressure‘ boundary condition from the drop down menu.
Enter a pressure value of 25 bar or 2.5*10e6 Pa.
Assign the boundary condition to ‘face82@solid1‘, as shown in figure below.
Numerics and Simulation Control are already indicated as complete via the green checks. This means that reasonable default values are already chosen for them.
Start a simulation run
The last thing to do is to create a run.
It is done by clicking on the ‘+’ symbol next to ‘Simulation Runs’.
Give a name to the run and click on ‘Start’.
Once the simulation is finished, select ‘Solution Fields’ to post-process the results on the platform. Results can also be downloaded and post-processed locally (e.g. with ParaView).
In the post-processing environment, select “Results” and then “von Mises stress”.
Similarly the displacement field can be visualized as shown below
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