Surface Roughness Variation with Surface Finish on Trunnion-Taper Interface
Type of Submission
Poster
Keywords
Surface roughness, topography, taper, trunnion, metal-on-metal, hip implant
Abstract
The trunnion-taper interface of a hip implant is known to undergo fretting corrosion, which can lead to many issues in the body including metal toxicity. Manufacturing parameters such as surface roughness could be a factor in fretting corrosion, as larger asperities in the surface could cause more fretting corrosion. Polishing, turning, and grinding each produce different surface roughnesses. A white light interferometric microscope is an effective way to measure surface roughness. It provides a close up look at surface topography and a better understanding of the roughness parameters. The overall goal of this research is to find a relationship between fretting corrosion and surface roughness. To do this, we needed to control our manufacturing process for surface roughness. We chose to machine all of our trunnion coupons by turning them on the lathe. We were able to alter the depth and width of the asperities in the surface by changing machine settings. This allowed us to produce specimens with an acceptable range of arithmetic mean roughness values that were within manufacturing tolerances of commercially available trunnions. Our results provide a correlation of machine and surface roughness parameters that will be used in subsequent experiments.
Faculty Sponsor or Advisor’s Name
Dr. Norman
Campus Venue
Stevens Student Center
Location
Cedarville, OH
Start Date
4-1-2015 11:00 AM
End Date
4-1-2015 2:00 PM
Creative Commons License
This work is licensed under a Creative Commons Attribution-Noncommercial-No Derivative Works 4.0 License.
Surface Roughness Variation with Surface Finish on Trunnion-Taper Interface
Cedarville, OH
The trunnion-taper interface of a hip implant is known to undergo fretting corrosion, which can lead to many issues in the body including metal toxicity. Manufacturing parameters such as surface roughness could be a factor in fretting corrosion, as larger asperities in the surface could cause more fretting corrosion. Polishing, turning, and grinding each produce different surface roughnesses. A white light interferometric microscope is an effective way to measure surface roughness. It provides a close up look at surface topography and a better understanding of the roughness parameters. The overall goal of this research is to find a relationship between fretting corrosion and surface roughness. To do this, we needed to control our manufacturing process for surface roughness. We chose to machine all of our trunnion coupons by turning them on the lathe. We were able to alter the depth and width of the asperities in the surface by changing machine settings. This allowed us to produce specimens with an acceptable range of arithmetic mean roughness values that were within manufacturing tolerances of commercially available trunnions. Our results provide a correlation of machine and surface roughness parameters that will be used in subsequent experiments.
