Structural Stability

1
Structural Stability

• Imran Ahmed
• Tony Martinelli
• Rob Ramer
• Pete Rogers

2
Overview

• Project Goal
• Method of Analysis
• Theoretical Background
• Current Structure
• Structure without supports
• Comparative Analysis of 2 Structures
• Conclusions

3
Project Goal

• Exploring installation of second block icing
  stand.
• Analyze the current stand under normal loading
  conditions.
• Analyze stand without angled support beams under
  normal loading conditions.
• Compare results.

4
Method of Analysis

• Structures were originally drawn in ProE and
  saved as .IGES files. Structures were then
  imported into ANSYS Workbench for analysis.
• Once geometry was imported, fixed supports and
  loading conditions were added.
• Structural Analysis was completed.
• Von-Mises stresses.
• Total Deformation.
• Comparative analysis of two structures.

5
Theoretical Background

• Von Mises Stress1
• The Von Mises criteria is a formula for combining
  these 3 stresses into an equivalent stress, which
  is then compared to the yield stress of the
  material.
• If the Von Mises Stress exceeds the yield stress
  divided by a safety factor, then the material is
  considered to be at the failure condition.

6
Current Structure

• Structure has angled support beams.
• Area 1 Loading
• 250 lbs - platform pallet jack
• 50 lbs pallet
• 1100 lbs ingredients used
• 1400 lbs total
• Area 2 Loading
• 100 lbs flooring weight
• 200 lbs operator
• 300 lbs total
• Area 3 Loading
• 250 lbs - platform pallet jack
• 50 lbs pallet
• 1850 lbs ingredients used
• 2050 lbs total

1
2
3
7
Current Structure Equivalent Stress Analysis

• Maximum stress was on the platform in area 3.

• Very little stresses on the legs.

1
3
2
2
1
3
8
Current Structure Total Deformation

• Maximum deformation located in red.
• .013487 in.

9
Structure w/o Angular Supports

• Area 1 Loading
• 250 lbs - platform pallet jack
• 50 lbs pallet
• 1100 lbs ingredients used
• 1400 lbs total
• Area 2 Loading
• 100 lbs flooring weight
• 200 lbs operator
• 300 lbs total
• Area 3 Loading
• 250 lbs - platform pallet jack
• 50 lbs pallet
• 1850 lbs ingredients used
• 2050 lbs total

1
2
3
10
Structure w/o Angular SupportsEquivalent Stress
Analysis

• Most stress in area 3.

1
2
3
11
Structure w/o Angular SupportsTotal Deformation

• Most deformation occurs on outside legs of area 3.

1
2
3
12
Structural ComparisonEquivalent Stress

• Red area represents 500.54 psi.
• Less area of maximum stress.

Red area represents 534.53 psi.
13
Structural ComparisonTotal Deformation

• Max. deformation .013487 in
• Less total area in max deformation.

• Max. deformation .014094 in

14
Conclusions

• Benefits of angular supports
• Equivalent Stress
• Area exhibiting maximum stress was reduced.
• Maximum stress reduced by approximately 35 psi.
• Total Deformation
• Area exhibiting maximum deformation was reduced.
• Detriments of angular supports
• Slightly more deformation across total area of
  the platform.

15
Acknowledgements

• Prof. Nema for his expertise on ANSYS.
• KB Specialty Foods for allowing the use of their
  block icing structure.

16
Bibliography

• 1 Moaveni, S. (2008). Finite Element Analysis
  Theory and Applications w/ ANSYS. Upper Saddle
  River, NJ Pearson Prentice Hall.
• 2 various. (2007, December). Elastic Properties
  and Youngs Modulus for some materials. Retrieved
  December 9, 2007, from The Engineering Toolbox
  http//www.engineeringtoolbox.com