Finite element analysis of elasto-plasticity contact of tubing connections and fatigue tests

The finite element analysis of the elasto-plasticity connection of the tubular joints under the action of cycle tensile load has been made, the mechanical characteristics of the tubular joints shown under the action of cycle load, particularly the cycle laws and the amplitudes at the collection position (the root of the first joggle. tooth) of the stress and strain have been,given. The local stress and strain analysis method was used to predict the fatigue life of the tubular joints. The result shows that the fatigue life of the tubular joints of J55 with 1.5, 1.75, and 2 turns of normal coning was more than three years under the cycle tensile load of 60similar to120kN.