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Stress Concentration in Snap Ring Grooves. Jon Shelley Doug Hogge. Description of Project. Description of Project. Create a Model to Determine Stress in a Snap Ring Groove Calculate Stress Concentration Factor Create Graph Showing Stress Concentration

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description of project3
Description of Project
  • Create a Model to Determine Stress in a Snap Ring Groove
  • Calculate Stress Concentration Factor
  • Create Graph Showing Stress Concentration
  • Compare Results to Actual Snap Ring Groove Dimensions
model macro file
Model – Macro File

!IMPORT PARAMETERS

PARRES, CHANGE,ring,exp,

!Keypoints

k,1,0,0

k,2,0,l

k,3,OD/2,l

k,4,OD/2,t/2+r

!Material Properties

MP, EX, 1, 30.00000E+06

MP, NUXY, 1,0.27

!Mesh Constraints

LESIZE,8, , ,12,0, , , ,1

ames,2

!Boundary Conditions and Loads

SFL,8,PRES,-FYload,

  • !Solve Model
  • /SOLU
  • SOLVE
  • !Retrieve Output
  • nsort,s,y
  • *get,syMax,sort,0,max
  • !Save Output to a File
  • /output,ring,post,,
  • !Exit Macro File
  • /EXIT,NOSAVE,,,
model geometry
Model-Geometry
  • Radius (0.005” – 0.015”)
  • Gap (0.1”)
  • OD (1”- 4”)
  • Ratio (1.02 – 1.1)
  • Height (2”)
model mesh
Model-Mesh
  • Refined
    • Elements (1,649-10,132)
    • Nodes (5,140 – 31,005)
  • Mapped and Free Mesh
  • Original
    • Elements (53-400)
    • Nodes (200-1,517)
model boundary conditions
Model-Boundary Conditions
  • Surface Load
  • Axisymmetric Element
  • Symmetry about X-Axis
model verification
Model Verification
  • Original – (1 hr)
  • Refined – (7 hrs)
  • Two Models – (0.5% - 1%)
  • Original vs. Refined – (2% - 11%)
slide12
DOE
  • Outside Diameter
    • 13 Values (1” – 4”)
  • Radius
    • 4 Values (0.005” 0.007” 0.01” 0.015”)
  • Ratio of Outside to Inside Diameter
    • 9 Values (1.02 – 1.1)
  • Total of 468 Runs
doe results
DOE Results
  • Stress Increase as
    • Radius Decreases
    • Ratio Increase
    • OD Increases
comparison to actual values
Comparison to Actual Values
  • Error Between Actual and Calculated Values (0.05% - 4.09%)
conclusion
Conclusion
  • Refined model produced less variation but increased processor time
  • Ansys can be used as a powerful tool for design studies
  • Model should be compared with actual data
  • From our results equations could be found to calculate stress concentration in snap ring grooves