MAE 323: Lab 9 Instructions - padtinc.com · MAE 323: Lab 9 Problem Definition/Outline Hydraulic...

MAE 323: Lab 9

Hydraulic Valve Assembly Engineering

Instructions

© 2011 Alex Grishin MAE 323 Lab Instructions 1

and Susanna Young

MAE 323: Lab 9


Lab Information and Objectives

• The lab objectives are: – Teaching the importance of qualifying a part based up strict design

criteria

• This lab will require that students synthesize the tools they have learned thus far in the course to conduct an initial analysis on a part which will require – Geometry modification – A mesh convergence study – Boundary condition application – Reporting results


and Susanna Young

MAE 323: Lab 9

• In Lab 9, focuses on the entire FEA process

Lab 9 focus


FEA Process

Geometry

Meshing

Loads and Boundary Conditions

Solving

Post-processing


MAE 323: Lab 9

Problem Definition/Outline


• A hydraulic valve assembly (Figures 1 and 2 on following slides) is subjected to three load environments.

• The unit is mounted flush to a flat surface at the

four mount locations shown. • Determine (and report) the maximum von Mises

stress response to the four loading environments.


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MAE 323: Lab 9

Figure 1


Figure 1 Isometric view of valve assembly showing coordinate reference (for loading)


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MAE 323: Lab 9

Figure 2


Figure 2 Cutaway view showing O-ring detail and threaded filter/manifold interface

© 2011 Alex Grishin

MAE 323 Lab Instructions 6 and Susanna Young

MAE 323: Lab 9


Geometry and Mechanical Setup

• The geometry is provided • Import and generate • Use Inches as your units • You should have two separate solid bodies (FILTER_BOWL,

MANIFOLD) • This is a 3D model • Add the washer faces based upon the demonstration during lab • Define your material properties per table 1 of the report

template • Drag a Static Structural to onto your geometry on your Project

Page and rename it ‘operational_pressure’

• Add the washer faces based upon the washer dims given


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MAE 323: Lab 9

Material Properties


• Define your materials per table 1 of the report template:

Detail Young’s

Density Poisson's

Material Description Modulus

Nomenclature

Ratio

(psi) (lb/in3)

Valve Manifold 7050-T73511 1.03E+07 0.102 0.33

Filter Bowl 7075_T7351 1.04E+07 0.101 0.33


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MAE 323: Lab 9

Loading Environment


• The following load case is to be evaluated for the valve assembly model. Note that the operational valve pressure should be applied to all internal surfaces up to the O-ring groove, as shown in Figure 3.

Description Load

Valve Operational Pressure 3400 psi

Table 3 Loading environment summary


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MAE 323: Lab 9

Pressure Application



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MAE 323: Lab 9

Pressure Loading


• Apply the pressure loads on the two different bodies separately

51 Faces Total 10 Faces Total


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MAE 323: Lab 9

Applying the pressure


• You may find it difficult to apply the pressure load to all the manifold surfaces (because they’re hard to select) • One thing that may make this easier is to create a slice plane to access the inside of the model.

… to do this, first

select the view

normal to the cross-

section (slice) you

want to create. In

this example, I’m

selecting the Z

coordinate axis +Z


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MAE 323: Lab 9


•So now you’re looking down the axis you want.

Now click on the “view section plane button”



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MAE 323: Lab 9


•Now draw a line for your slice by LMB and drag the mouse…

•This is what you’ll end up

with. Click on either side of the section control slider to click on the side you want to look at (or into). You can also slide the controller to move the section plane



and Susanna Young

MAE 323: Lab 9



•Now, hide the part you don’t want to see. You

should now be able to look (and select) the interior surfaces on which you want to apply pressures

© 2011 Alex Grishin

MAE 323 Lab Instructions 16 and Susanna Young

MAE 323: Lab 9

Fixity (Boundary Conditions)


• The valve manifold is bolted to a flat mounting surface. It is bolted with 3/8” diameter steel bolts with ¾” OD washers.

• After creating the washer faces think what

boundary conditions should be applied on the top and bottom of the part on which you have created washer face.


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MAE 323: Lab 9

Finite Element Model


• You are to determine what element types and mesh settings would be best to model the response of the valve assembly to the loading environment summarized in table 3.

• A model such as this usually requires some iterative

adjustment of the mesh or mesh settings in order to obtain an answer within reasonable accuracy. It is recommended that you start with a global mesh size of 0.15”. Refer to the mesh metric slide to assist you in this process


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MAE 323: Lab 9

Finite Element Model Cont.


• For the pressure analysis, insert an area size control to refine the elements on the area surrounding the highest stress location after you get your first solution (you may also use a sphere of influence, or any other mesh settings you see fit).

• Make sure your Advanced Sizing Functions is turned to ‘Off’

(expand Mesh>Sizing>Off)


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MAE 323: Lab 9

Results: Mesh Metric


• Use the Mesh Metric to help you determine the quality of elements • Under Mesh, expand Statistics and choose a mesh metric of Element Quality


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MAE 323: Lab 9

Results: Mesh Metric


• When your mesh is generated click on the Mesh Metric bar that will appear at the bottom of your screen

• Use this to determine the areas of low quality elements and refine in

these areas


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MAE 323: Lab 9

Results: Force Reaction Probe


• Add a force reaction probe at the washer’s fixed supports


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MAE 323: Lab 9

Further Results


• Refer to the template for results and figures required


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