HyperWorks Solvers

RD-3030: Buckling of a Tube using Half Tube Mesh

RD-3030: Buckling of a Tube using Half Tube Mesh

 Previous topic Next topic No expanding text in this topic  

RD-3030: Buckling of a Tube using Half Tube Mesh

 Previous topic Next topic JavaScript is required for expanding text JavaScript is required for the print function  

Simulate buckling of a tube using half tube mesh with symmetric boundary conditions.

The figure illustrates the structural model used for this tutorial: a half tube with a rectangular section (38.1 x 25.4 mm) and length of 203 mm.

rd3030_model

Model

Model Description

•UNITS: Length (mm), Time (ms), Mass (kg), Force (kN) and Stress (GPa)
•Simulation time: Engine [0 – 10 ms]
•The tube thickness is 0.914 mm.
•An imposed velocity of 13.3 mm/ms (~30 MPH) is applied to the right end of the tube
•Elasto plastic material using Johnson-Cook law /MAT/PLAS_JOHNS (STEEL).

[Rho_Initial] Initial density = 7.85e-6 Kg/mm3

[E] Young’s modulus = 210  GPa

[nu] Poisson coefficient = 0.3

[a] Yield Stress = 0.206 GPa

[b] Hardening Parameter = 0.450 GPa

[n] Hardening Exponent = 0.5

File needed to complete this exercise: BOXTUBE_0000.rad

 

Exercise

Step 1:  Import the mesh

1.Open HyperCrash and set the User profile: to RADIOSS V14 and the Unit system: to kN mm ms kg.
2.Set User interface style as New.
3.Set the working directory to <install_directory>/tutorials/hwsolvers/radioss/.
4.Click Run.
5.Click File > Import > RADIOSS.
6.In the input window, select BOXTUBE_0000.rad.
7.Click OK.

Step 2:  Create and assign a material

1.Click Model > Material.
2.In the window, right-click and choose Create New > Elasto-plastic > Johnson-Cook (2).

rd3030_create_new

3.For Title, enter Steel.

Enter all the material data, as shown in the following figure.

rd3030_plas_johns

4.Right-click in Support entry box and click Select in graphics and select Include picked parts selectpartgeneral-24 and select boxtube in the graphics area.
5.Press ENTER, or click Yes in the lower right corner.
6.Click Save > Close.

Step 3:  Create and assign a property

1.Click Model > Property.
2.In the window, right-click and select Create New > Surface > Shell (1).

rd3030_create_surface_12

3.For Title, enter Pshell.
4.For Shell thickness, enter 0.914.

rd3030_shell

5.Right-click in the Support entry box and click Select in graphics and select Include picked parts selectpartgeneral-24 and select boxtube in the graphics area.
6.Press ENTER or click Yes in the lower right corner.
7.Click Save > Close.

Step 4:  Define Rigid Body

1.Click Mesh Editing > Rigid Body. Right-click in the display list area and select Create New.
2.Right-click in the graphic area and select Add nodes by box selection icon selectbyboxadd-24 to select the nodes in the graphic window, as shown below:

rd3030_rigid_body

3.Press ENTER or click Save to validate.

rd3030_rigid_body2

Note:For the remainder of the tutorial, you need to have the ID of the master node of the rigid body.
4.Click Show Node Info icon node_information in the toolbar, and select the rigid body master node in the graphic window. The Node ID appears in the message window (node ID: 803).
5.Click Cancel in the lower right corner to exit the picking loop.
6.Click Close.

Step 5:  Define boundary condition applied on rigid body

1.Click LoadCase > Boundary Condition.
2.Right-click in the display list area and select Create New.
3.In the Boundary condition field, enter the name Rigid_BC.
4.In the Node by Id field, enter 803, then click Ok.
5.To constrain the nodes, toggle the buttons in Tx, Ty, Rx, Ry and Rz.

rd3030_bc1

6.Click Save.

Step 6:  Define boundary condition representing symmetry

1.In the Boundary condition display list area, select Create New. Name the new constraint set symmetry.
2.Right-click in the Support entry box and click Select in graphics and select Add nodes by box selection icon selectbyboxadd-24 to select the nodes in the graphic window, as shown below:

rd3030_bc2

3.Right-click to validate.
4.Toggle the buttons Tx, Ry and Rz.
5.Click Save > Close.

Step 7:  Define the imposed velocity

1.Click LoadCase > Imposed Velocity. Right-click in the display list area and select Create New.
2.For Title, enter VELOCITY.
3.Right-click in the Time function parameter entry box and select Define New. A Function Window opens.
4.For the function name, enter FUNC_VEL.
5.Enter the first point (0, 13.3) and click Validate.
6.Enter the second point (1e30, 13.3) and click Validate.
7.Click Save in the Function Window to accept the function.
8.Expand the Advanced selector at the bottom and in the Node by Id field, enter 803 and click Ok, (or toggle Add RB master nodes).
9.Go to the Properties tab and enter a Y-Scale factor = -1.
10.Set the direction of the imposed velocity to Z (translation).
11.Click Save > Close.

rd3010_imposed_velocity

Step 8:  Define a Rigid Wall

1.Click LoadCase > Rigid Wall > Create.
2.For the Select RWALL, select Infinite Plane.
3.For Title, enter RIGID WALL.
4.Enter the following values: M0: X= 0, Y= 38.1, Z= -204. M1: X= 0, Y= 38.1, Z= 1.
5.In the Distance to search slave nodes field, enter 20.
6.Toggle See option.
7.Click See to visualize it in the graphic window.

rd3030_rigid_wall

8.Click Save > Close.

Step 9:  Create a self contact for the tube

1.Click LoadCase > Contact Interface.
2.Right-click in the Contact Interface list and select Create New > Multi usage (Type 7).
3.Toggle Self impact.

rd3030_self-impact

4.Right-click in the graphic area, and select Include picked parts icon selectpartgeneral-24 and select the part in the graphic window.
5.Click Yes in the lower right corner of the main window to validate.
6.For Title, enter the name Contact.
7.Set Scale factor for stiffness as 1.
8.Set Min. gap for impact active to 0.900.
9.Set Coulomb friction to 0.200.
10.Click Save > Close.

Step 10:  Export the model

1.Under the Model menu, select Control Card.
2.Check Control Card to activate it.
Note:Make sure to save it before moving to the next Control Card.

rd3030_control_card

rd3030_control_card2

rd3030_control_card3

rd3030_control_card4

3.Click File > Export > RADIOSS.
4.In the Write Block Format 140 RADIOSS File window that opens up, enter the name BOXTUBE and click OK.
5.Leave the Header of RADIOSS File window empty and click Save Model.

The Starter file BOXTUBE_0000.rad is written.

The model is now ready to run through the Starter and the Engine.

Step 11: Open RADIOSS from Windows Start menu

rd3030_solver_run_mgr

Step 12:  Review the listing files for this run and verify on the results

1.Using HyperView, plot the displacement and strain contour at 10 ms.

Exercise Expected Results

rd3030_results_14

Total Displacement (mm) and Plastic Strain (Mid Layer and Average)

See Also:

RADIOSS Tutorials

HyperCrash User's Guide