| Mikhail V. Pesin | Sc.D., professor, deputy director | Department “Innovative manufacturing engineering” Perm national research polytechnic university, Perm, Russian Federation M.Pesin@mail.ru |
| Vladimir F. Makarov | Sc.D., professor, deputy head | Department “Innovative manufacturing engineering” Perm national research polytechnic university, Perm, Russian Federation |
Showing the relationship between the constructive and technological process of hardening threaded conical surface drill pipe (geometry of a strengthening of the movie, the size of the load, radius of hollow), magnitude and distribution of residual stresses in a threaded surface based on complex mathematical models developed and a series of pilot studies stress-strain state threads and fatigue tests.
