Abstract: The virtual contact loading method is developed to simulate the elasto-plastic contact phenomenon between the screw flanks of a screwed - pipe joint. In the conditions of elasto-plastic small deformation, the load and stress concentration factor distributions along the threads and the stress distributions in the mating screw flanks are studied and the reasonal results are found out.

Key words: Drilling rod, Elasto-plastic deformation, Joint, Screwed - pipe