I am designing a drive line that must be threaded. I have a size constraint (maximum)on the diameter that must be used. I have tried to use V-Threads but when I add the stress concentration factor of 2.8 to the calculation my stress is well above allowable. I am looking for stress concentration factors for round form threads. I thought about using the concentration factor for a radius grooved shaft. If any one has any ideas I would appreciate the help.
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