中国物理B ›› 2016, Vol. 25 ›› Issue (2): 24303-024303.doi: 10.1088/1674-1056/25/2/024303

所属专题： Virtual Special Topic — Acoustics

• ELECTROMAGNETISM, OPTICS, ACOUSTICS, HEAT TRANSFER, CLASSICAL MECHANICS, AND FLUID DYNAMICS • 上一篇    下一篇

Experimental and numerical studies of nonlinear ultrasonic responses on plastic deformation in weld joints

Yan-Xun Xiang(项延训), Wu-Jun Zhu(朱武军), Ming-Xi Deng(邓明晰), Fu-Zhen Xuan(轩福贞)   

  1. 1. Key Laboratory of Pressure Systems and Safety of Ministry of Education, School of Mechanical and Power Engineering, East China University of Science and Technology, Shanghai 200237, China;
    2. Department of Physics, Logistics Engineering University, Chongqing 400016, China
  • 收稿日期:2015-07-31 修回日期:2015-09-07 出版日期:2016-02-05 发布日期:2016-02-05
  • 通讯作者: Fu-Zhen Xuan E-mail:fzxuan@ecust.edu.cn
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant Nos. 51325504, 11474093, and 11474361) and the Shanghai Rising-Star Program, China (Grant No. 14QA1401200).

Experimental and numerical studies of nonlinear ultrasonic responses on plastic deformation in weld joints

Yan-Xun Xiang(项延训)1, Wu-Jun Zhu(朱武军)1, Ming-Xi Deng(邓明晰)2, Fu-Zhen Xuan(轩福贞)1   

  1. 1. Key Laboratory of Pressure Systems and Safety of Ministry of Education, School of Mechanical and Power Engineering, East China University of Science and Technology, Shanghai 200237, China;
    2. Department of Physics, Logistics Engineering University, Chongqing 400016, China
  • Received:2015-07-31 Revised:2015-09-07 Online:2016-02-05 Published:2016-02-05
  • Contact: Fu-Zhen Xuan E-mail:fzxuan@ecust.edu.cn
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant Nos. 51325504, 11474093, and 11474361) and the Shanghai Rising-Star Program, China (Grant No. 14QA1401200).

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摘要： The experimental measurements and numerical simulations are performed to study ultrasonic nonlinear responses from the plastic deformation in weld joints. The ultrasonic nonlinear signals are measured in the plastic deformed 30Cr2Ni4MoV specimens, and the results show that the nonlinear parameter monotonically increases with the plastic strain, and that the variation of nonlinear parameter in the weld region is maximal compared with those in the heat-affected zone and base regions. Microscopic images relating to the microstructure evolution of the weld region are studied to reveal that the change of nonlinear parameter is mainly attributed to dislocation evolutions in the process of plastic deformation loading. Meanwhile, the finite element model is developed to investigate nonlinear behaviors of ultrasonic waves propagating in a plastic deformed material based on the nonlinear stress-strain constitutive relationship in a medium. Moreover, a pinned string model is adopted to simulate dislocation evolution during plastic damages. The simulation and experimental results show that they are in good consistency with each other, and reveal a rising acoustic nonlinearity due to the variations of dislocation length and density and the resulting stress concentration.

关键词: ultrasonic nonlinearity, second harmonics, plastic deformation, finite element modeling

Abstract: The experimental measurements and numerical simulations are performed to study ultrasonic nonlinear responses from the plastic deformation in weld joints. The ultrasonic nonlinear signals are measured in the plastic deformed 30Cr2Ni4MoV specimens, and the results show that the nonlinear parameter monotonically increases with the plastic strain, and that the variation of nonlinear parameter in the weld region is maximal compared with those in the heat-affected zone and base regions. Microscopic images relating to the microstructure evolution of the weld region are studied to reveal that the change of nonlinear parameter is mainly attributed to dislocation evolutions in the process of plastic deformation loading. Meanwhile, the finite element model is developed to investigate nonlinear behaviors of ultrasonic waves propagating in a plastic deformed material based on the nonlinear stress-strain constitutive relationship in a medium. Moreover, a pinned string model is adopted to simulate dislocation evolution during plastic damages. The simulation and experimental results show that they are in good consistency with each other, and reveal a rising acoustic nonlinearity due to the variations of dislocation length and density and the resulting stress concentration.

Key words: ultrasonic nonlinearity, second harmonics, plastic deformation, finite element modeling

中图分类号:  (Nonlinear acoustics)

  • 43.25.+y
62.20.-x (Mechanical properties of solids) 81.70.Cv (Nondestructive testing: ultrasonic testing, photoacoustic testing)