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MAE 323: Lab 4 Meshing Exercise

Instructions

© 2011 Alex Grishin MAE 323 Lab Instructions 1


Background and Context


MAE 323: Lab 4

Part Description

Meshing Exercise

4 x Anchor bolts

Tent-pole The part we will analyze is a footer (anchor flange) used to secure tent-poles for fairgrounds and outdoor conferences


MAE 323: Lab 4 • We will want to analyze

the anchor flange part for transverse wind loads imposed on the tent poles

Meshing Exercise

Force due to wind loading

Anchor flange must withstand stress imposed by the pole (under wind loading)



• At this stage, we are still getting our feet wet in terms of building, interpreting, and validating finite element models. In this lab, we will use a simplified version of the footer part. We will get rid of the bolts, bolt-holes, set screw, and tent-pole. We will focus on a simplified (defeatured) version of the footer in order to learn something about the meshing process. In particular, we want to get a feel for how different meshes may affect the results

Simplified footer part



Problem Definition and Objectives


MAE 323: Lab 4

• Problem Definition:

Meshing Exercise

Part 1: Create four different meshes corresponding to four different scenarios in order to gain a fundamental understanding of meshing and the meshing tools available in part 2: Place a consistent load and boundary condition on the four meshes and compare results.

ANSYS 13.0 • Lab Objectives:

– Create a standard tetrahedral mesh – Create a tetrahedral mesh with an edge refinement – Create a tetrahedral mesh with a square of influence refinement – Create a hexahedral mesh – Learn more basics of the Workbench Project page – Learn the differences between different mesh refinement strategies and

types of meshes

• Learning objective – To realize that meshing is a bottleneck (requires the most manual

intervention) within the FEA process, but a necessary one – To begin to understand what a “proper” mesh is


MAE 323 : Lab 4 Boundary Conditions


Force

100 lb

Fixed to ground

MAE 323 : LAB 4 SiZiNG instructions 1. Use Body Sizing of 0.125

2. Use Edge Sizing of 1 division(For Hexahedral Mesh) 3. Drop Midside Nodes 4. For Sphere of Influence use Sphere Rad.= 0.7 in 5. Use Element Size = 3.125e-002 6. Refer to the lab template to complete this exercise.



Part 1:

Import

the:

© 2011 Alex Grishin

"Geometry"

MAE 323 Lab Instructions

10

MAE 323: Lab 4 PART 1

Meshing Exercise

• Double-Click (DC) on the Geometry icon to bring up the DesignModeler interface

DC



1. Set the units to Inches

2. Import external geometry: File>Import External Geometry File…

3. Browse to the folder where you downloaded the uncut geometry file



4. Click Generate

5. Close DesignModeler



6. Back on your project page, Right-Mouse-Click on the Geometry system>Rename>uncut geometry



7. Drag a Static Structural analysis system to your project page making sure to share (drag and drop geometry from “uncut” to “static structural”) the geometry with the geometry component system you have already created



8. Open Mechanical by DC-ing on the Model icon

– You should see the geometry

9. Change the Units from mm to in 11

10. Click on Mesh in the Project tree

11. Add a Body Sizing of 0.125 in

11



12. Drop the mid-side nodes

12

With the mesh highlighted, select “Dropped” next to “Element Midside Nodes in the Details View




Accordingly insert

multiple static structural

modules and rename

them according to the

mesh type they analyze.

The Nomenclature for the

Static Structural Modules


Part 2:

Solve and Compare Models


MAE 323: Lab 4 PART 2

Meshing Exercise

• You should now have the following four different meshes of the same geometry: • A course tetrahedral mesh of geometry • A tetrahedral mesh with edge-refinement • A tetrahedral mesh with regional refinement (sphere of

influence) • A course hexahedral mesh

• In part two, we want to apply a consistent load and boundary condition to the four meshes we have constructed and note any differences in the results (see template for details)



“Fix” the entire bottom surface of the part as below:

Apply a 100

pound force in the y-direction to the surfaces shown below:


mae323 lab instructions lab3 - padtinc.com

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