I am investigating a field failure due to wear of a SAE52100 ball bearing over Titanim. I have the failed part so I can determine the total wear volume in mm^3. However, I don't have the time it took wear the part out. The part is experiencing random vibrations and there is an undesirable additional pressure on the ball that would have lead to ball pressing against the Ti component. How would I go about determining a. Force caused due to random vibrations. b. Additional side load thats's acting upon the ball given that I know the rate of wear assuming certain time period?
These are not straight forward tasks, especially when the time of service is not known. You have to have so many assumptions and a lot of data sets. Force due to vibrational component could be guestimated from the dislocation density of the part provided if you have a calibrated data of stress versus dislocation density data for that material. For example, these data (stress vs. dislocation density) are available for nuclear grade stainless steel to estimate the amount of cold working. The load can be estimated or extrapolated from the wear volume if you have the wear rate data at different loads and degraded microstructure-load-time correlation.
Thank you Mr. Krishnan. With your above guidance I am trying to look for research material on a. How to determine the dislocation densities in Ti-6al-4v and b. What's a good source of calibrated dislocation density plots for Ti-6al-4v.
Once this data is generated I understand your approach to guestimating the load due to vibration.
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