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# Tutorial - Stress Analysis in ALGOR?

By Sudhir Gill on 09 Mar 07:06 4 answers 1932 views 5 comments

Tutorial on Stress Analysis in ALGOR. The model used Support Bracket by Manolis Theofilos.

Here is the tutorial. Since the model used is created in AutoDesk inventor we will not have any problem using it in ALGOR.

1. ### Step 1

Start ALGOR and click Open.

2. ### Step 2

Open the assembly file.

3. ### Step 3

Now the model is opened.

4. ### Step 4

Click 3D Mesh settings.

5. ### Step 5

Here we can change the mesh size to coarse or fine. Let's keep the default settings since fine size will take more time and coarse will have less accuracy.

6. ### Step 6

Click Generated 3D mesh. This will create 3D Mesh automatically.

7. ### Step 7

Now the mesh is generated. As we can see that one part is red in color because the material is not defined for it.

8. ### Step 8

Right click it and select edit material.

9. ### Step 9

Select material in library.

10. ### Step 10

Zoom in to the hole.

11. ### Step 11

Under selection tab select circle.

12. ### Step 12

Top view. Now click in the center of the hole and make a circle so as to enclose the hole.

13. ### Step 13

This will select the hole surface.

14. ### Step 14

Right click >> Add >> Surface boundary condition.

15. ### Step 15

Click Fixed and the Degree of freedom of those surface will become constrained.

16. ### Step 16

Repeat same procedure for other holes.

17. ### Step 17

Select point tool in selection tab and click on the upper face of the bracket.

18. ### Step 18

Right click >> Add >> Surface Force.

19. ### Step 19

Enter a value of 500N i.e. ~51Kg. Keep Direction Normal. Click OK and the force is applied.

20. ### Step 20

Now our model is prepared for simulation. Click Run Simulation in Analysis tab to start simulation.

21. ### Step 21

The solver will start solving the problem.

22. ### Step 22

After done we have the results of the analysis.

23. ### Step 23

Click Displacement in Result contour tab for displacement results.

24. ### Step 24

Here is the file.

#### Attachments

Assembly1.zip, 763 KB

Here I am going to show how to apply pressure to a surface. we are going to use the same model.

#### Attachments

report.PDF, 364 KB
1. ### Step 1

We open the assembly in ALGOR

2. ### Step 2

We mesh our model and add constraints (as shown by Sudhir above) and from the setup tab we choose pressure.

3. ### Step 3

We choose the top surface of our bracket and press Enter. We choose 500N/mm^2 as our input value.
As we can see the pressure is applied to all the surface. In real life conditions this may not be the case. Lets say that we have a beam mounted on our bracket but the beam is not on all the surface.

4. ### Step 4

What we should do is "tell" ALGOR where we want the pressure to be applied. So we need to split the surface and we are going to do so in Inventor. (Inventor Fusion can also be used).
Once we open our model we double click on the top part.

5. ### Step 5

This opens the modeling mode for this part. we create a sketch on the top face

6. ### Step 6

We draw two lines as shown in the image

7. ### Step 7

We finish our sketch and choose split

8. ### Step 8

We choose the face we want to split and the line in which the split will be made.We click OK.

9. ### Step 9

After this our sketch is consumed. Since we need to continue spliting we must go to the model browser,expand the split feature, right click on the sketch and choose share sketch.

10. ### Step 10

We repeat step 8 and click return. Our model should look like this. Note that some welds are removed because the face was splited. We should add them manually once more. (see my tutorial about welds here http://grabcad.com/questions/how-to-model-support-bracket-in-inventor-2011 )

11. ### Step 11

From the Add-ins tab we choose Start Simulation. this will open Algor.

12. ### Step 12

We choose Linear-->Static stress with linear material models

13. ### Step 13

We mesh our model again and add constraints as before.
We choose to add pressure, click on the top surface we splited and press enter.

14. ### Step 14

As we see only part of the surface is selected. alternately we could select the faces on the edges and leave the midlle stress free.

15. ### Step 15

We choose Run simulation and wait for the simulation to end.

16. ### Step 16

In the results screen we can choose from a variety of contours to display.

17. ### Step 17

We can export a report file. Just go to the Report tab (located next to the model history). You can choose the contents of the report from there and the type of file you want to save your report. PDF, Word, RTF, HTML and Web publishing are available.

Very nice tutorial. I have been playing with ALGOR some time now.
The reason why welds are not defined automatically is because they are recognized as features and not as extra material. You can choose to exclude them from simulation.
Also for a more acurate result the contact type between the backplate and the two vertical supports should be set to sliding-separation, because the parts are hold together only by the welds.