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The finite element model of the internal rolling connection process for Titanium alloy tubes was established. The distribution of the elastic strain and the contact force were analyzed to reveal the sealing mechanics of the flareless union. The residual compressive stress was generated between the tube and sleeve, which made the tube and sleeve contact closely. Through the microscopic view analysis of the connection interface between the tube and sleeve before and after vibration test, the vibration fatigue inactivation mechanism was disclosed. In the action of circulate vibration load, fretting wear generated between the tube and sleeve, which broke the original contact state. Then the tube and sleeve can’t connect closely and the joint became inactivate.

Study on the Sealing and Inactivation Mechanics of Titanium Alloy Tube Flareless Internal Rolling Connection