Distributional analysis of residual stresses with the Ti-6Al-4V internal trapezoidal thread torsional vibration extrusion

  • Yuan-Jun Hou
  • Dun-Wen ZuoEmail author
  • Yu-Li Sun
  • Le Wang
  • Lan Li


The aim of this study is to actively explore the quantitative measurement of residual stress of trapezoidal internal threads after extrusion processing. In this paper, innovative stress test specimens of the Ti-6Al-4V alloy disc with a diameter of 86 mm and a thickness of 20 mm were designed, and vibration extrusion tapping was carried out with a Tr14*2 extrusion tap in the center of the disc. Then, based on the elastic principle and the linear superposition principle, the incremental slicing method or crack flexibility method was applied to retrieve the residual stress distribution from the strain measurement. The stress distributions along the axial direction of the threaded hole and along the tangential and normal directions of the threaded hole were measured. The redistribution law of internal residual stress of extruded internal threaded parts was explored and studied, which provides a basis for studying the fatigue resistance of materials. In addition, the three-dimensional finite element method was used innovatively to calculate the stress flexibility factor of circular pie specimens with finite boundary constraints as not used the previous two-dimensional plane strain approximation.


Residual stress Slitting measurement Ti-6Al-4V Cold extrusion 


Funding information

Foundation item: Project was supported by (KYLX16_0321) Postgraduate Research & Practice Innovation Program of Jiangsu Province.


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Copyright information

© Springer-Verlag London Ltd., part of Springer Nature 2019

Authors and Affiliations

  • Yuan-Jun Hou
    • 1
  • Dun-Wen Zuo
    • 1
    Email author
  • Yu-Li Sun
    • 1
  • Le Wang
    • 2
  • Lan Li
    • 1
  1. 1.College of Mechanical and Electrical EngineeringNanjing University of Aeronautics and AstronauticsNanjingChina
  2. 2.State Key Lab of Mechanics and Control of Mechanical StructuresNanjing University of Aeronautics and AstronauticsNanjingChina

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