Creating different types of 1D elements with given cross section and DOF s in Hypermesh

OBJECTIVE:

Create 1D elements on the following component with given cross-section and DOF

a. Rod element:- with only translational DOF and RBE2 link

Cross-Section: BOX- Dimension a= 12 mm

                              dimension b=10 mm

                              Thickness t= 0.75 mm

b. Beam element:- with all DOF and RBE3 link

Cross-Section: I Section- Dimension a= 8 mm

                                     Dimension b= 10 mm

                                     Dimension c= 8.5 mm

                                     Thickness t1= 0.75 mm

                                     Thickness t2= .6 mm

                                     Thickness t3= .6 mm

c. Bar element:-  with only x and y DOFs With RBE3 link

Cross-section: CROSS section- Dimension DIM1= 5 mm

                                             Thickness DIM2= 1.2 mm

                                             Dimension DIM3= 10 mm

                                             Thickness DIM4= 1.2mm

d. & e. apply the mass of magnitude 10 with RBE2 link

f. Join the two components with Spring elements  

PROCEDURE:

1. Go to Import Solver Deck>>Import Geometry>>File Type: IGES>>Import. The geometry is imported

2. Go to Delete>>Lines>>All>>Delete Entity. Turn off the Display Fixed Points Option.

3. Go to Geom>>midsurface>>surfs>>Select the upper bracket>>Extract.

4. Go to Model View>>Rename the Middle Surface to Upper Bracket and assign blue colour for reference. Create a component named \"Lower Bracket\" and assign green colour for reference.

5. Go to Geom>>midsurface>>surfs>>Select the Lower bracket>>Extract. Now a new component named Middle Surface gets created on the Model View.

6. Delete the components PARALLEL_BRACKET_Body_0 and PARALLEL_BRACKET_Body_1.

7. Go to Tool>>Organize>>surfs>>Select the lower midsurface>>Move. This is done to ensure that meshing is done separately to two extracted mid surfaces.

8. Now Delete the Middle Surface in the components from the Model View section.

9. Go to Entities>>Create>>Material>>Steel

10. Go to Entities>>Create>>Property>>Upper Bracket>>Material>>Steel. Similarly create another property named lower bracket and assign material as steel.

11. Now for the components upper bracket and lower bracket assign the corresponding property.

12. Go to Geom>>autocleanup>>surfs>>all>>target elem size parameter=5>>autocleanup>>return

13. Go to 2D>>automesh>>surfs>>all>>element size 5>>mesh>>return. After meshing the surface is obtained as shown in the figure

14. Go to 1D>>rigids>>multiple nodes>>calculate nodes>>by path>>uncheck dof 4, dof 5 and dof 6.>>create nodes around the washer split region a as shown in the diagram.

15. Go to 1D>>rbe3>>tick the all the dependent dofs>>nodes by path>>create nodes around the washer split region b as shown in the diagram.

16. Go to 1D>>rbe3>>uncheck dof3 and dof6>>nodes by path>>create nodes around the washer split region c as shown in the diagram.

17. Go to 1D>>HyperBeam>>standarad section>>standard I section>>create>>Enter all the dimensions given for beam element in the Parameter Definition>>Rename the section as Beam. It is shown in the figure below

18. Go to entities>>Create>>Standard Section>>OptiStruct>>CROSS>>Enter all the dimensions given for bar element in the Parameter Definition>>Rename the section as Bar. It is shown in the figure below

19. Go to entities>>Create>>Standard Section>>OptiStruct>>BOX>>Enter all the dimensions given for rod element in the Parameter Definition>>Rename the section as Rod. It is shown in the figure below. Click Model View to return to the main page.

20. Go to Model View>>Create>>Property>>Beam>>Change card image to PBEAM>>Material>>Steel>>Beam Section>>Beam.

21. Go to Model View>>Create>>Property>>Bar>>Change card image to PBAR>>Material>>Steel>>Beam Section>>Bar.

22. Go to Model View>>Create>>Property>>Rod>>Change card image to PROD>>Material>>Steel>>Beam Section>>Rod.

23. Go to 1D>>rods>>elem types=CROD>>Select the nodes in the region a>>CROD element is created. It is shown in the diagram below

24. Go to 1D>>bars>>elem types=CBEAM>>Select the nodes in the region b>>CBEAM element is created. It is shown in the diagram below

25. Go to 1D>>bars>>elem types=CBAR>>Select the nodes in the region c>>CBAR element is created. It is shown in the diagram below

26. Go to 1D>>bars>>update>>property>>Bar>>update>>Tick box the property and local axis>>update

27. Go to 1D>>bars>>update>>Elements>>Select CBAR>>property>>Bar>>update>>Tick box the property and local axis>>update

28. Go to 1D>>bars>>update>>Elements>>Select CBEAM>>property>>Beam>>update>>Tick box the property and local axis>>update

29. Go to 1D>>rods>>update>>Elements>>Select CROD>>property>>Rod>>update

30. Change to 1D Detailed Element Representation. Click Shaded Elements and Mesh Lines. It is shown in the figure below

31. Go to 1D>>rigids>>multiple nodes>>calculate nodes>>by path>>create nodes around the washer split region d.

32. Go to Nodes>>Mass=10>>Elem types=CMASS1>>Select the node corresponding to rbe2>>Create. Similarly, assign mass for node in lower bracket in region d. It is shown in the figure below

33. Go to 1D>>rigids>>multiple nodes>>calculate nodes>>by path>>create nodes around the washer split region e.

34. Go to Nodes>>Mass=10>>Elem types=CMASS1>>Select the node corresponding to rbe2>>Create. Similarly, assign mass for node in lower bracket in region e. It is shown in the figure below

35. Go to Model View>>Create>>Property>>Rename as Elastic>>Change card image to PELAS.

35. Go to 1D>>springs>>elem types=CELAS1>>Select the corner nodes>>Spring element is created. Similarly, create spring element in the region f.

36. Go to 1D>>springs>>update>>property=Elastic>>Select the elastic elements>>tick the boxes corresponding to dofs and property.

37. The final image is shown below

RESULT AND CONCLUSION:

1. Therefore, various 1D elements (Bar, Rod, Beam and spring elements) are created in the component from the given cross-section and  DOF\'s using midsurfacing and meshing option.

2. Creating and editing various links such as rbe2, rbe3, spring elements, bar, rod and hyperbeam sections are learnt from the challenge.