Rigid Element Analysis with RBE2 and CONM2
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1 WORKSHOP 8 Rigid Element Analysis with RBE2 and CONM2 Y Z X Objectives: Create a geometric representation of a tube. Use the geometry model to define an analysis model comprised of plate elements. Idealize a rigid end using RBE2 elements. Define a concentrated mass to represent the weight of the rigid enclosure (CONM2). Run an MSC/NASTRAN linear static analysis. View analysis results. MSC/NASTRAN for Windows 101 Exercise Workbook 8-1
2 8-2 MSC/NASTRAN for Windows 101 Exercise Workbook
3 WORKSHOP 8 Rigid Element Analysis with RBE2 and CONM2 Model Description: Figure 8.1 The goal of this example is to maintain a circular cross section at the rigid end of the tube, (using a RBE2 element), while applying a gravitational force of 2.7g in the z-direction. Additionally, a concentrated mass needs to be defined to represent the weight of the rigid enclosure. It is very important to account for all the weight contribution since inertial loading is used in this problem. Below is a finite element representation of the tube. One end of the tube is considered rigid, and the other end is fixed in all translational and rotational degrees of freedom. Table 8.1 contains all the necessary parameters to construct the input file. Grid Coordinates and Element Connectivites Loads and Boundary Conditions lb lumped mass Applied Load = 2.7g in z-axis Table Material Properties Radius: Thickness: Length: 15 in in 90 in Elastic Modulus: 10E6 lbs/in 2 Density: lbs/in 3 Poisson s Ratio: 0.3 MSC/NASTRAN for Windows 101 Exercise Workbook 8-3 MSC/NASTRAN for Windows 101 Exercise Workbook 8-3
4 Exercise Procedure: 1. Start up MSC/NASTRAN for Windows 3.0 and begin to create a new model. Double click on the icon labeled MSC/NASTRAN for Windows V3.0. On the Open Model File form, select New Model. Open Model File: New Model 2. Create an elasto-plastic material called mat_1. From the pulldown menu, select Model/Material. Model/Material... Title: Youngs Modulus: mat_1 10e6 Poisson s Ratio: 0.3 Mass Density: Create a property called tube to apply to the members of the tube itself. From the pulldown menu, select Model/Property. Model/Property... Title: tube To select the material, click on the list icon next to the databox and select mat_1. Material: 1..mat_1 Thicknesses, Tavg or T1: MSC/NASTRAN for Windows 101 Exercise Workbook
5 WORKSHOP 8 Rigid Element Analysis with RBE2 and CONM2 4. Create the NASTRAN geometry for the tube. First, create a cylindrical coordinate system. Model/Coord Sys... ID: 3 Title: Method: Type: tube_coordinate XY Locate Cylindrical Define Coordinate System Origin. X: Y: Z: Define Location on CSys X-Axis. X: Y: Z: Define Location in CSys XY-Plane. X: Y: Z: Now create the surface of the tube. Geometry/Surface/Cylinder... X: Y: Z: Base: MSC/NASTRAN for Windows 101 Exercise Workbook 8-5
6 X: Y: Z: Tip: On the CSys drop down menu, select tube_coordinate. CSys: 3..tube_coordinate Now input the radii of the cylinder. Radii/Bottom Outer: Use Autoscale and Rotate to better view model. View/Autoscale View/Rotate... Isometric 7. Now define the mesh size on the tube. Mesh/Mesh Control/Mapped Divisions on Surface... Select All s t Number of Element: 5 5 Bias: Finally, create the finite element entities. 8-6 MSC/NASTRAN for Windows 101 Exercise Workbook
7 WORKSHOP 8 Rigid Element Analysis with RBE2 and CONM2 Mesh/Geometry/Surface... Select All The Messages and Lists window should confirm with 2 Surface(s) Selected. Property: Node Param... Output Coordinate System: 1..tube 3..tube_coordinate The Messages and Lists window should confirm with Merging, which signals auto-merging of the coincident nodes. Below that, there is a line that reads Ready - Nodes: 60, Elements: Now define the concentrated mass and the node point where the concentrated mass will be applied. Model/Node... R: 0 T: 0 Z: 90 ID: 999 Model/Property... Title: Elem/Property Type... Other Elements concentrated_mass Mass MSC/NASTRAN for Windows 101 Exercise Workbook 8-7
8 In the Property Values box, specify the mass. Mass, M or Mx: 500 Now apply the concentrated mass to the model at Node 999. Model/Element... ID: 999 Property: 2..concentrated mass Node: Now, idealize a rigid end using RBE2 elements. Model/Element... Type... Other Elements: Rigid Under the Independent box, select the degrees of freedom. Node: 999 DOF (click to select): TX TY TZ (click to deselect): RX RY RZ Under the Dependent box, select all the nodes along the free edge. Nodes... ID: 11 to: 15 by: 1 More 8-8 MSC/NASTRAN for Windows 101 Exercise Workbook
9 WORKSHOP 8 Rigid Element Analysis with RBE2 and CONM2 ID: 52 to: 56 by: 1 More Check the messages box that Element 1000 was created. 12. Create the nodal constraint. Before creating the appropriate constraints, a constraint set needs to be created. Do so by performing the following. Model/Constraint/Set... Title: constraint Now define the relevant constraint for the right free edge. Model/Constraint/Nodal... ID: 1 to: 6 by: 1 More ID: 43 to: 46 by: 1 More Fixed MSC/NASTRAN for Windows 101 Exercise Workbook 8-9
10 Check the messages box that 10 Nodes were selected. 13. Create the loading condition. Model/Load/Set... Title: inertia Now define the inertia load. Model/Load/Body... To input Translation/Gravity, check on Active next to Acceleration box. Create the nodal constraint. It is the first Active box from the top. Translation/Gravity: (length/time/time) Active X: Y: Z: Now create and submit the analysis file. File/Export/Analysis Model... Analysis Format/Type: 1..Static Change the directory to C:\Temp. File Name: rigid Write Additional Info: Run Analysis 8-10 MSC/NASTRAN for Windows 101 Exercise Workbook
11 WORKSHOP 8 Rigid Element Analysis with RBE2 and CONM2 Advanced... Problem ID: Rigid Element Analysis Under PARAM, enter the following: WTMASS When asked if you wish to save the model, respond Yes. Yes File Name: Save rigid When the MSC/NASTRAN manager is through running, MSC/ NASTRAN will be restored on your screen, and the Message Review form will appear. To read the messages, you could select Show Details. Since the analysis ran smoothly, we will not bother with the details this time. Continue 15. List the results of the analysis. To list the results, select the following: List/Output/Unformatted... Select All Unselect All Vectors and instead select T3 Translation in the pull down menu. All Vectors, or MSC/NASTRAN for Windows 101 Exercise Workbook 8-11
12 4..T3 Translation NOTE: You may want to expand the message box in order to view the results. Answer the following questions using the results. The answer is listed at the end of the exercise. What is the displacement for Point ID s 11 to 15 and 52 to 56? T3 = This concludes the exercise MSC/NASTRAN for Windows 101 Exercise Workbook
13 WORKSHOP 8 Rigid Element Analysis with RBE2 and CONM2 T3: MSC/NASTRAN for Windows 101 Exercise Workbook 8-13
14 8-14 MSC/NASTRAN for Windows 101 Exercise Workbook
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