Yang Gongpeng, Zhou Zhenggan, Ma Tengfei, Teng Lichen, Wang Jun, Zhou Yuxuan, Li Yang, Zhou Wenbin
School of Mechanical Engineering and Automation, Beihang University, Beijing, 100191, China.
Ningbo Institute of Technology, Beihang University, Ningbo, 315800, China.
Sci Rep. 2023 Sep 21;13(1):15686. doi: 10.1038/s41598-023-42887-4.
Ultrasonic testing is an important non-destructive testing method, which is sensitive to the defects in the diffusion bonding interface. Ultrasonic testing of diffusion bonding interfaces in complex-surface components is a challenge due to the geometry and the weak echo signal of the diffusion bonding defects. This paper proposes an interfacial stiffness characterization method based on the spring model for the ultrasonic testing of the diffusion bonding interface of titanium alloy complex-surface component. Finite element models for ultrasonic field are established to analyze the diffusion bonding defects response, the effect of complex surface, and the inconsistency of the bonding interface depth in ultrasonic testing of the titanium alloy complex-surface component. 15 MHz is recommended as the testing frequency of the diffusion bonding interface. Ultrasonic C-scan experiments are conducted using specimens with embedded artificial defects and a titanium alloy complex-surface component. The simulation and experimental results show that the novel interfacial stiffness characterization method can be applied to ultrasonic testing of the diffusion bonding interface (inclination angle less than 14°) in complex-surface components, and the ability to test defects at the diffusion bonding interface can be improved.
超声检测是一种重要的无损检测方法，它对扩散连接界面中的缺陷很敏感。由于复杂表面部件中扩散连接界面的几何形状以及扩散连接缺陷的回波信号较弱，对其进行超声检测是一项挑战。本文针对钛合金复杂表面部件扩散连接界面的超声检测，提出了一种基于弹簧模型的界面刚度表征方法。建立了超声场有限元模型，以分析钛合金复杂表面部件超声检测中扩散连接缺陷响应、复杂表面的影响以及连接界面深度不一致的问题。建议将15MHz作为扩散连接界面的检测频率。使用带有嵌入式人工缺陷的试样和钛合金复杂表面部件进行了超声C扫描实验。模拟和实验结果表明，该新型界面刚度表征方法可应用于复杂表面部件中扩散连接界面（倾斜角小于14°）的超声检测，并且可以提高检测扩散连接界面缺陷的能力。
