Nodal force report extraction example

In this example, you use the bolt shear method to create a margin of safety calculation for the pin in the piston rod. However, rather than using the analysis results directly, in this example you create a nodal force report from which you extract the result for the margin of safety calculation. Assume the shear strength of the pin in single shear is 50,000 N. Also assume that the compressive forces act in the Y-direction and the faces on the crank-end of the piston rod are fixed to ground.

Note:

This example assumes that grid point forces were calculated during the linear static analysis of the piston rod and that you have already created load case sets from these results. Also assume that the Calculation Creation dialog box is open and Bolt shear is already selected as the method.

1. On the Inputs tab, in the Single Shear Load Allowable (Pss) box, type 50000.The shear strength of the pin is 50,000 N.

2. In the Load Factor (f) box, type 0.5.The load factor for a pin in double shear is 0.5.

3. Next to Shear Load (P), click and select Nodal Force Report from the list.

4. Click Edit Nodal Force Report.If you are using an existing nodal force report, you can skip steps 5 through 19.

5. In the Nodal Force Report Extraction dialog box, in the Nodal Force Report group, click Create Nodal Force Report .

6. In the Nodal Force Report dialog box, in the Forces group, from the Force Type list, select Grid Point.

7. Select the Grid Point Reaction Force check box.

8. In the Solution Step group, from the Step list, select All.When you select All, you are assured that the software will calculate the margin of safety using the load case set that you selected.

9. In the graphics window, select the two polygon faces that are fixed to ground.

10. In the Output Options group, select the Add all Forces and Moments check box.The software will calculate a force-couple system about a reference point that is mechanically equivalent to the distribution of grid point reaction forces.

11. In the Moment Options group, click Point Dialog .

12. In the Point dialog box, from the Point list, select Between Two Points.

13. In the Points group, from the Specify Point 1 list, select Arc/Ellipse/Sphere Center.

14. In the graphics window, pick the top circular edge.

15. From the Specify Point 2 list, select Arc/Ellipse/Sphere Center.

16. In the graphics window, select the bottom circular edge.

17. In the Location Between Points group, in the % Location box, type 50.

18. Click OK.The reference point about which the software calculates a force-couple system that is mechanically equivalent to the selected grid point reaction forces is located along the center line of the pin midway through the thickness of the piston rod.

19. In the Nodal Force Report dialog box, click OK.

20. In the Nodal Force Report Extraction dialog box, in the table, select the nodal force report.

21. In the Selection group, from the Result Type list, select Forces.

22. From the Component list, select Y.

23. In the Preview group, click Preview .In the Information window, you can view the value that the software will use in the margin of safety calculation. To change a negative value to a positive value, do the following:On the Nodal Force Report Extraction dialog box, from the Absolute Values list, select Yes.Click Preview to refresh the Information window.

24. Click to close the Information window.

25. In the Nodal Force Report Extraction dialog box, click OK.

26. In the Calculation Creation dialog box, click OK.

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