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 Compare Results to Actual Snap Ring Groove Dimensions

Method Used to Accomplish Project Macro File Results 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 OD (1”- 4”) Ratio (1.02 – 1.1) Height (2”) Radius (0.005” – 0.015”) Gap (0.1”)

Model-Mesh Refined Original Elements (1,649-10,132) Elements (53-400) Nodes (5,140 – 31,005) Mapped and Free Mesh Original Elements (53-400) Nodes (200-1,517)

Model-Boundary Conditions Surface Load Axisymmetric Element Symmetry about X-Axis

Model Verification Original – (1 hr) Refined – (7 hrs) Two Models – (0.5% - 1%) Original vs. Refined – (2% - 11%)

FEA Results

Stress Concentration Factor  

DOE Outside Diameter Radius Ratio of Outside to Inside 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 Stress Increase as Radius Decreases Ratio Increase OD Increases

Stress Concentration Plot

Comparison to Actual Values Error Between Actual and Calculated Values (0.05% - 4.09%)

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