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王耀勉,杨换平,庄唯,剡文斌.单球撞击纯钛中的宏观和微观残余应力[J].稀有金属材料与工程(英文),2020,49(10):3369~3376.[Wang Yaomian,Yang Huanping,Zhuang Wei and Yan Wenbin.Macroscopic and microscopic residual stress in single shot impacted pure titanium[J].Rare Metal Materials and Engineering,2020,49(10):3369~3376.]
Macroscopic and microscopic residual stress in single shot impacted pure titanium
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Received:September 09, 2019  Revised:November 15, 2019
DOI:
Key words: residual stress  finite element  impacting  plastic deformation  titanium
Foundation item:陕西省重点研发计划(2017GY-115);陕西省教育厅科研项目(16JK1466)
Author NameAffiliation
Wang Yaomian,Yang Huanping,Zhuang Wei and Yan Wenbin  
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Abstract:
      The finite element method (FEM) and elasto-plastic self-consistent (EPSC) method were used to simulate the mechanical response of pure titanium subjected to single steel shot impacting at different shot sizes and velocities. The macroscopic and microscopic residual stresses were calculated. The results indicate that the observed macroscopic residual compressive stress increases with an increase in the shot size and impacting velocity. In addition, the macroscopic residual stress calculations correlate well with the residual elastic strain. The microscopic residual stresses lie within a range that varies with depth. Furthermore, the statistical distribution of the microscopic residual stress agrees well with the Gaussian distribution. Additionally, the dispersion of microscopic residual stresses, determined by the effective plastic deformation, is influenced by the shot size and impacting velocity. With an increase in the impacting velocity and decrease in the shot size, the standard deviation of the microscopic residual stresses at a certain depth increases.