際際滷

際際滷Share a Scribd company logo

Linear-Eigenvalue-Buckling.pdf Mech_BSN_17.0_WS05.1_

jntuhcej
jntuhcej

Linear-Eigenvalue-Buckling

1 of 12
Download to read offline
1 息 2016 ANSYS, Inc. May 31, 2016 Workshop 05.1: Linear (Eigenvalue) Buckling 17.0 Release ANSYS Mechanical Basic Structural Nonlinearities
2 息 2016 ANSYS, Inc. May 31, 2016 Goal Use Eigenvalue Procedure to predict force necessary to produce buckling in a thin column. Introduction
3 息 2016 ANSYS, Inc. May 31, 2016 Model Description L shaped frame represented with 3D Line Bodies Meshed with 3D Beam elements Linear Elastic Material Model Description
4 息 2016 ANSYS, Inc. May 31, 2016 Model Description (contd) Horizontal beam fixed at far end. Vertical column simply supported at bottom. All nodes are constrained from movement in Z direction. Compressive unit load (1 lb) applied 10 inches off center of vertical column. Model Description
5 息 2016 ANSYS, Inc. May 31, 2016 Steps to Follow: Restore Archive browse for file SNLWS05.1-buckling.wbpz Save as File name: WS05.1-buckling Save as type: Workbench Project Files (*.wbpj) Project Startup
6 息 2016 ANSYS, Inc. May 31, 2016 The project Schematic should look like the picture to the right. From this Schematic, you can see that the Engineering (material) Data and Geometry have already been defined (green check marks). It remains to set up and run the FE model in Mechanical. Open the Engineering Data Cell (highlight and double click OR Right Mouse Button (RMB)>Edit). To see relevant dialog boxes, it might be necessary to go to Utility Menu > View.. Click on Properties and Outline. Verify that the units are in US Eng units (lb, in,) system. If not, fix this by clicking on: Utility Menu > Units > US Engineering(lb, in,). Project Schematic
7 息 2016 ANSYS, Inc. May 31, 2016 Return to Project Schematic From the Analysis Systems Folder of the Toolbox, drag and drop an Eigenvalue Buckling Template onto the Solution Cell of the existing Static Structural Template and Refresh the Project. Open Mechanical (Double click on the Setup). Project Schematic
8 息 2016 ANSYS, Inc. May 31, 2016 The frame model is already set up with the displacement boundary conditions and a unit force load. Highlight the BCs and Load to confirm that the model is properly supported and loaded. Model Description
9 息 2016 ANSYS, Inc. May 31, 2016 Note the Static Structural Analysis Settings Specifications: This is a linear analysis Auto Time Stepping = Program Controlled Large Deflection = Off For the Eigenvalue Buckling, we will take the default Analysis Settings to calculate the 1st eigenvalue load required to induce buckling. Analysis Settings
10 息 2016 ANSYS, Inc. May 31, 2016 Run the prestressed Eigenvalue buckling solution: Highlight the Solution Branch of the Eigenvalue Buckling Analysis to find the Load Multiplier. Since a unit force load was applied, this load multiplier value (296) represents the magnitude of load necessary to begin a perturbation that leads to buckling. Solve the Model
11 息 2016 ANSYS, Inc. May 31, 2016 RMB on the buckling solution to Create Mode Shape Results Postprocessing
12 息 2016 ANSYS, Inc. May 31, 2016 Evaluate Total Deformation results (Use results scaling to exaggerate the displacement). Keep this Project open for the next workshop. Postprocessing

More Related Content

Linear-Eigenvalue-Buckling.pdf Mech_BSN_17.0_WS05.1_

  • 1. 1 息 2016 ANSYS, Inc. May 31, 2016 Workshop 05.1: Linear (Eigenvalue) Buckling 17.0 Release ANSYS Mechanical Basic Structural Nonlinearities
  • 2. 2 息 2016 ANSYS, Inc. May 31, 2016 Goal Use Eigenvalue Procedure to predict force necessary to produce buckling in a thin column. Introduction
  • 3. 3 息 2016 ANSYS, Inc. May 31, 2016 Model Description L shaped frame represented with 3D Line Bodies Meshed with 3D Beam elements Linear Elastic Material Model Description
  • 4. 4 息 2016 ANSYS, Inc. May 31, 2016 Model Description (contd) Horizontal beam fixed at far end. Vertical column simply supported at bottom. All nodes are constrained from movement in Z direction. Compressive unit load (1 lb) applied 10 inches off center of vertical column. Model Description
  • 5. 5 息 2016 ANSYS, Inc. May 31, 2016 Steps to Follow: Restore Archive browse for file SNLWS05.1-buckling.wbpz Save as File name: WS05.1-buckling Save as type: Workbench Project Files (*.wbpj) Project Startup
  • 6. 6 息 2016 ANSYS, Inc. May 31, 2016 The project Schematic should look like the picture to the right. From this Schematic, you can see that the Engineering (material) Data and Geometry have already been defined (green check marks). It remains to set up and run the FE model in Mechanical. Open the Engineering Data Cell (highlight and double click OR Right Mouse Button (RMB)>Edit). To see relevant dialog boxes, it might be necessary to go to Utility Menu > View.. Click on Properties and Outline. Verify that the units are in US Eng units (lb, in,) system. If not, fix this by clicking on: Utility Menu > Units > US Engineering(lb, in,). Project Schematic
  • 7. 7 息 2016 ANSYS, Inc. May 31, 2016 Return to Project Schematic From the Analysis Systems Folder of the Toolbox, drag and drop an Eigenvalue Buckling Template onto the Solution Cell of the existing Static Structural Template and Refresh the Project. Open Mechanical (Double click on the Setup). Project Schematic
  • 8. 8 息 2016 ANSYS, Inc. May 31, 2016 The frame model is already set up with the displacement boundary conditions and a unit force load. Highlight the BCs and Load to confirm that the model is properly supported and loaded. Model Description
  • 9. 9 息 2016 ANSYS, Inc. May 31, 2016 Note the Static Structural Analysis Settings Specifications: This is a linear analysis Auto Time Stepping = Program Controlled Large Deflection = Off For the Eigenvalue Buckling, we will take the default Analysis Settings to calculate the 1st eigenvalue load required to induce buckling. Analysis Settings
  • 10. 10 息 2016 ANSYS, Inc. May 31, 2016 Run the prestressed Eigenvalue buckling solution: Highlight the Solution Branch of the Eigenvalue Buckling Analysis to find the Load Multiplier. Since a unit force load was applied, this load multiplier value (296) represents the magnitude of load necessary to begin a perturbation that leads to buckling. Solve the Model
  • 11. 11 息 2016 ANSYS, Inc. May 31, 2016 RMB on the buckling solution to Create Mode Shape Results Postprocessing
  • 12. 12 息 2016 ANSYS, Inc. May 31, 2016 Evaluate Total Deformation results (Use results scaling to exaggerate the displacement). Keep this Project open for the next workshop. Postprocessing