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Team 43
Team Members |
Faculty Advisor |
Colin Hersom |
Prof. Kyungjin Kim Sponsor Pratt & Whitney |
sponsored by
High Cycle Fatigue Notch and Volume Effects
This senior design project explores the effects of notch plasticity and stressed volume on fatigue life, specifically high cycle fatigue. Pratt & Whitney is interested in understanding how stress gradients arising from surface damage influence the fatigue life of parts with small stressed volumes. The team handled the design, fabrication, and fatigue testing processes for two specimens of differing geometries. The objective was to design and fabricate two specimens, one smooth and one notched, with the same stressed volume below 10^-3 in^3, that could be reasonably fabricated and tested in high cycle fatigue conditions. A smoothed specimen was created using a tube design and a notched specimen was created in a round specimen with multiple u-shaped notches. Multiple of each specimen were successfully fabricated using a lathe. This includes a total of 4 smooth and 3 notched specimens. A testing setup was designed for a tensile test stand utilizing a vise grip clamp and a hex thread adapter. Fatigue testing was successfully initiated first by manual cycling tests and then by way of cycling software. The team recorded and exported data from several low and high cycle fatigue tests on both specimens.