Finite element modeling for the harderning drill pipe thread

Abstract

In this paper, showing the relationship between the constructive and technological process of hardening threaded conical surface drill pipe, 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 of threaded connection are presented.Performed computer simulations of the hardening of the hollow carving deep roll. The conceptual and mathematical formulation of the problem is determined. As a result of a series of numerical experiments using ABAQUS package evaluation of residual stresses distributions are obtained depending on the degree mounting of the roll.From the point of view of the mechanics of a deformable solid, the problem of modeling the process of thread rollingto three-dimentional non-stationary contact problems of elastic-plastic deformation.The complex geometry of the simulated bodies excludes the possibility of using analytical methods to solve sucha problem, so a system of hypotheses for constructing a mathematical model is introduced.The area of the pin thread material for the modeling object is selected.Set the relationship between the constructive and technological process parameters folding 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.