Numerical Simulation of Tensile Process of Linear Friction Welded Joint of Heterogeneous Titanium Alloys
The joint zoning modeling method was explored based on the microstructure characteristics and material properties of linear friction welding(LFW)joint,and the numerical simulation of tensile process of TC11/TC17 heterogeneous titanium alloy LFW joint was realized by using finite element technology.Meanwhile,the evolution law of stress and strain in different welding areas during tensile process was revealed,and the mechanical properties and fracture location of the joint were predicted.The results show that under the tensile loading condition of 2000 N uniformly distributed load,it is predicted by numerical calculation that the yield strength of TC11/TC17 heterogeneous titanium alloy LFW joint is 1045MPa and the tensile strength is 1082MPa,with an error of less than 2.5%compared with the actual measured value.The peak stress is located at the edge of the nugget zone of the joint,and there is stress and strain concentration in TC11 base metal at the position 24.2 mm away from the weld center,in which the stress value is more than 1057 MPa and the maximum strain can reach 18.52%.The necking phenomenon also occurs at this position,indicating that the TC11/TC17 heterogeneous titanium alloy LFW joint breaks at the position.
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