Week 4-1D Element Creation Challenge

OBJECTIVE:-

The main objective is to mesh the brackets model with a size of 5 units and to create 1D elements for a component with given cross-section and DOF. The 1D elements are like rod element, beam element, bar element, and spring elements. Also to apply the masses of magnitude 10 with the RBE 2 link on the given position.  

CAD MODEL IMAGES:-

• The given file of parallel brackets in .IGS format is imported into the hyperworks software as shown in fig.1 below.

FIG.1: GIVEN CAD MODEL OF BRACKET.

FIG.2: GIVEN CAD MODEL OF BRACKET.

FIG.3: GIVEN CAD MODEL OF BRACKETS IN TRANSPERENT GEOMETRY VIEW.

 

PROCEDURE WITH REQUIRED IMAGES:

1. MIDDLE SURFACE GENERATION:-

• To generate middle surface the midsurface tool is used in geometry section under main menu.
• After opening it the first option is selected that is auto midsurface and auto extraction. The surfaces of the component are selected for extracting mid-surface as shown in fig.4 below.

FIG.4: SELECTION OF BRACKET FOR AUTO MIDSURFACE EXTRACTION.

• After giving left click over extract option the middle surface will generate in a selected part of component as shown in fig.5 below.

FIG.5: EXTRACTED MIDSURFACE OF BRACKET IN TRANSPERENT GEOMETRY VIEW.

 

• Similarly, for another bracket the middle surface is generated as shown in fig.6 below.

FIG.6: EXTRACTED MIDSURFACE OF BRACKETS IN TRANSPERENT GEOMETRY VIEW.

• At the same time new component names are created with the new IDs in component list for the generated mid-surfaces as shown in fig.6.
• After generating the mid-surfaces, the original parent bodies are deleted using delete option which is visible after giving right click on component name.
• After deleting the parent bodies the only two mid-surfaces are visible as shown in fig.7 below.

FIG.7: EXTRACTED MIDSURFACES OF BRACKETS WITH NEW NAME IN COMPONENT LIST.

• The organize option is used to assign the generated mid-surfaces with new names and ids in component list as shown in fig.8 below.
• An organize option which is available in tool section in main menu bar.

FIG.8: ASSIGN MIDSURFACES OF BRACKETS WITH NEW NAMES IN COMPONENT LIST USING ORGANIZE TOOL.

 

• Also material is assigned as shown in fig.8 below.

FIG.9: EXTRACTED MIDSURFACES OF BRACKETS WITH MATERIAL INDICATION.

• Similarly new properties are created for each bracket separately with different thicknesses and PSHELL as a card image as shown in fig.9 below.

 

FIG.10: EXTRACTED MIDSURFACES OF BRACKETS WITH SEPARATE PROPERTIES.

2. 2D MESH GENERATION :-

• Here before going for mesh generation process, the washer split has done where the holes are presents.
• The washer split option is available in quick edit tool which is present in geometry section as shown in fig.10 below.

     

FIG.11: PERFORMING WASHER SPLIT OPERATION OVER EXTRACTED MIDSURFACES.

• For meshing automesh tool is used which is available in 2D mesh section in main menu bar.
• In automesh, the element size 5 is given as input for meshing the brackets as shown in fig.11 below.

 

FIG.12: PERFORMING MESHING OVER EXTRACTED MIDSURFACES.

• After entering the mesh button, the meshing operation is performed as shown in fig.12 below.

FIG.13: MESHED EXTRACTED MIDSURFACES.

• Here rebuild mesh operation has been performed for reconstructing of mesh as shown in fig.13 below.
• The rebuild mesh option is available in 2D section in main menu bar. Also here we can observe the edit criteria option as shown in fig.13 below.

        

FIG.14: PERFORMING REBUILD MESH OPERATION.

 

3. 1D ELEMENT CREATION BETWEEN TWO BRACKETS WITH GIVEN CROSS-SECTION AND DOF:-

 

1. ROD ELEMENT:-

• Here the rod element is to be placed between two holes and these holes have been connected by RBE2 link with constraining all translational degrees of freedom.
• To create RBE2 link the rigid option is used which is available in 1D section at main menu bar.
• Inside the rigid option there are options for selecting independent node, dependent nodes and DOFs as shown in fig. 15 below.

 

FIG.15: CREATING RBE2 LINK BY CONSTRAINING TRANSLATIONAL DOF.

• After creating RBE2 link on both opposite holes the cross-section of box has to be created.
• To create box cross section, the HyperBeam option is available in 1D section at main menu bar.
• Shows below steps to create thinwalled box cross section.

 

FIG.16: HYPERBEAM TO CREATE THINWALLED BOX CROSS-SECTION.

FIG.17: HYPERBEAM TO CREATE THINWALLED BOX CROSS-SECTION BY SELECTING STANDARD SECTION.

• After entering on create button the HyperBeam window will open to create thinwalled cross-section as shown in fig.18 below.
• In parameter definition section the given dimension is entered as shown in fig. 18 below.

FIG.18: HYPERBEAM TO CREATE THINWALLED BOX CROSS-SECTION BY ENTERING GIVEN DIMENSIONS.

• After closing hyperbeam window the properties is to be created for 1D rod elements as shown in fig.19 below.

     

FIG.19: 1D ROD ELEMENT PROPERTY.

• By visualizing 1D & 3D beams in handle and visualization tool, we can see the 1D rod of box cross-section as shown in fig.20 below.

 

 

FIG.20: VISUALIZATION OF 1D ROD ELEMENT OF BOX CROSS SECTION.

1. BEAM ELEMENT :-

• Here the beam element is to be placed between two holes and these holes have been connected by RBE3 link with constraining all degrees of freedom.
• To create RBE3 link the rbe3 option is used which is available in 1D section at main menu bar.
• Inside the rbe3 option there are options for selecting independent node, dependent nodes and DOFs as shown in fig.21 below.

FIG.21: CREATED RBE3 LINK BY CONSTRAINING ALL DOF.

• After creating RBE3 link on both opposite holes, the cross-section of I-section has to be created.
• To create I-section cross-section, the HyperBeam option is available in 1D section at main menu bar.
• Shows below steps to create I-section cross-section.

FIG.22: HYPERBEAM TO CREATE STANDARD I-SECTION CROSS-SECTION BY SELECTING STANDARD SECTION.

• After entering on create button the HyperBeam window will open up to create I-section cross-section as shown in fig.23 below.
• In parameter definition section the given dimension is entered as shown in fig. 23 below.

FIG.23: HYPERBEAM TO CREATE I-SECTION CROSS-SECTION BY ENTERING GIVEN DIMENSIONS.

• After closing hyperbeam window the properties is to be created for 1D beam elements as shown in fig.19 below.

    

FIG.24: 1D BEAM ELEMENT PROPERTY.

• By visualizing 1D & 3D beams in handle and visualization tool, we can see the 1D BEAM of I-SECTION cross-section as shown in fig.25 below.

FIG.25: VISUALIZATION OF 1D BEAM ELEMENT OF I CROSS SECTION.

 

1. BAR ELEMENT :-

• Here the bar element is to be placed between two holes and these holes have been connected by RBE3 link with constraining only X and Y degrees of freedom.
• To create RBE3 link the rbe3 option is used which is available in 1D section at main menu bar.
• Inside the rbe3 option there are options for selecting independent node, dependent nodes and DOFs as shown in fig.21 below.

 

   

FIG.26: RBE3 LINK BY CONSTRAINING X AND Y DOFs.

• After creating RBE3 link on both opposite holes, the cross-section of X-section has to be created.
• To create X-section, the HyperBeam option is available in 1D section at main menu bar.
• Shows below steps to create X-section cross-section.

FIG.27: HYPERBEAM TO CREATE X-SECTION CROSS-SECTION BY SELECTING GENERIC SECTION.

• After entering on create button the HyperBeam window will open up to create X-section cross-section as shown in fig.28 below.
• In parameter definition section the given dimension is entered as shown in fig. 28 below.

FIG.28: HYPERBEAM TO CREATE X-SECTION CROSS-SECTION BY ENTERING GIVEN DIMENSIONS IN PARAMETER DEFINITION.

• After closing hyperbeam window the properties is to be created for 1D bar elements as shown in fig.29 below.

FIG.29: 1D BAR ELEMENT PROPERTY.

• By visualizing 1D & 3D beams in handle and visualization tool, we can see the 1D BEAM of I-SECTION cross-section as shown in fig.30 below.

FIG.30: VISUALIZATION OF 1D BAR ELEMENT OF X CROSS SECTION.

1. & E. MASS OF MAGNITUDE 10 :-

• At d & e location of brackets rbe2 link is to be created.
• The clustered type rbe2 link is creating at d & e location by constraining all dofs as shown in fig.31 below.

FIG.31: CREATING RBE2 LINK BY CONSTRAINING ALL DOFS.

• The all nodes are selected on the perimeter of the holes and washer line near the holes.
• After entering on create, the clustered RBE2 link is created as shown in fig. 32 below.

FIG.32: CREATED CLUSTERED RBE2 LINK BY CONSTRAINING ALL DOFS.

• Similarly on other holes at E location the clustered RBE2 link is created.
• The masses option is used to apply mass of magnitude 10.
• Masses option is available in 1D section at main menu bar.
• As shown in fig.32 below the masses of magnitude 10 are applied on the independent nodes of rbe2 at d and e location by entering on create.

FIG.32: MASSES OF MAGNITUDE 10 ON THE INDEPENDENT NODES OF RBE2 LINK.

1. JOINING THE TWO COMPONENT WITH SPRING ELEMENTS:-

• To create spring element between two components the spring option is used in 1D section at main menu bar.
• For creating spring elements, two nodes are to be selected by constraining 1 dofs as shown in fig.33 below.

FIG.33: SPRING ELEMENTS BY CONSTRAINING DOF1.

RESULTS:

Hence the 2D mesh is generated by extracting middle surface of brackets component. And 1D elements are deployed in between the two brackets by defining the cross section to the 1D element & assigning the property to them successfully.

FINAL MODEL IMAGE:

FIG.34: FINAL MODEL IMAGE OF BRACKETS COMPONENT.

 

NIOTE:- please find attachment for images.