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If you don't have Kimmo's level of qualifications and experience, you can always use an instrument to measure strain, which can then be converted into stress using Hooke's law
https://pieng.com/testing-overview/ultrasonic-torque-tension-testing/
https://ibt-usa.com/wp-content/uploads/2019/09/Ultrasonic-Measurement-of-Fasteners-Rev-6.pdf
gbj_tester
Kimmo
Stop teasing with that sexy chat..