16b - using units in mechanica - demo & procedure

7/27/2019 16b - Using Units in Mechanica - Demo & Procedure

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Theory and Mechanica Model Topics Using Units in Mechanica – Demonstration

UsingUnitsinMechanica_demo.mp4 Using Units in Mechanica – Procedure

Procedure: Using Units in Mechanica

ScenarioChange the default units of a pressure load, run an analysis, and view its results in

different units.

ChangingUnits pressure_vessel.asm

Task 1. Start the Mechanica application and edit the pressure load.

The default unit system for this model is IPS (inch-pound-seconds). As a

result, the default units for loads, constraints, and all measures will be in

this unit system.

1. 1. Click Applications > Mechanica.

2. 2. Click + next to Loads/Constraints in the model tree to expand the section.

3. 3. Click + next to Load Set LoadSet1 in the model tree to expand the section.

4. 4. Right-click the Gas_Pressure load and select Edit Definition.

Note that the current pressure is 100 psi.

Task 2. Convert the 100 psi pressure load to kPa and run the analysis.

1. Right-click in the Value field (on the 100) and click Convert to Unit > kPa.

Note that the conversion to kPa has been done automatically (1 psi =

6.89476 kPa).

2. Click OK to close the Pressure Load dialog box.



3. Click Mechanica Analyses/Studies .

4. If necessary, select Static_Analysis from the Analyses and Design Studies field.

5. Click Start Run > Yes to start the analysis.

6. Click Display Study Status once the analysis is started.

7. Wait for the analysis to complete before continuing.

The analysis should complete in 1 to 2 minutes.

8. Click Close from the Run Status dialog box to close it.

Task 3. Review the analysis results using different units.1. Click Results from the Analyses and Design Studies dialog box.

2. Verify that Stress, von Mises, and psi are selected in the fields on the Quantitytab.

3. Select the Display Options tab, select Deformed and type 5 in the Scaling field.

4. Click OK and Show and examine the von Mises stress results.

5. Click Copy from the results window toolbar.

6. Select the Quantity tab, then select MPa from the Units drop-down menu.

7. Click OK and Show and compare the two results windows.

Note that in terms of the fringe plots, there is no difference between the two

results. The differences appear in the text and legend values accompanyingeach window that state the units in which each is being presented.



8. When you are through examining the results, click File > Exit Results > No toclose the Results window.

9. Click File > Close Window > File > Erase > Not Displayed > OK from the mainmenu to close the window and erase all of the models from memory.

This completes the procedure.

16b - using units in mechanica - demo & procedure

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