Numerical and experimental studies on needle impact characteristics in ultrasonic shot peening

Qinglong Zhang; Su Zhao; Aziz Ul Hassan Mohsan; Lei Yu; Menggang Zhai; Xiaowen Qi

doi:10.1016/j.ultras.2021.106634

Numerical and experimental studies on needle impact characteristics in ultrasonic shot peening

Ultrasonics. 2022 Feb:119:106634. doi: 10.1016/j.ultras.2021.106634. Epub 2021 Oct 31.

Authors

Qinglong Zhang¹, Su Zhao², Aziz Ul Hassan Mohsan³, Lei Yu³, Menggang Zhai³, Xiaowen Qi⁴

Affiliations

¹ Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo, Zhejiang 315201, China; Zhejiang Key Laboratory of Aero Engine Extreme Manufacturing Technology, Ningbo 315201, China. Electronic address: zhangqinglong@nimte.ac.cn.
² Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo, Zhejiang 315201, China; Zhejiang Key Laboratory of Aero Engine Extreme Manufacturing Technology, Ningbo 315201, China. Electronic address: zhaosu@nimte.ac.cn.
³ Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo, Zhejiang 315201, China; Zhejiang Key Laboratory of Aero Engine Extreme Manufacturing Technology, Ningbo 315201, China.
⁴ School of Mechanical Engineering, Yanshan University, Qinhuangdao 066004, China.

PMID: 34781117
DOI: 10.1016/j.ultras.2021.106634

Abstract

Ultrasonic shot peening(USP) is an advanced surface treatment technology for obtaining excellent surface properties or manufacturing a three-dimensional curved surface of the metal sheets. The impact of the medium driven by ultrasonic vibration is significant to parameter optimization and excellent performance of the USP technology. However, the impact characteristics of the medium lack careful study, which is a complex dynamic analysis involving many factors, such as collision, plastic deformation, air pressure, etc. In this paper, a detection system is successfully developed to investigate the needle impact force and frequency against the material surface, consisting of a piezoelectric load sensor, oscilloscope, and a single needle USP device. Moreover, the FE model of the needle impact is developed simultaneously to study the characteristics of residual stress implantation induced by needle impact. Based on the experiment and FE simulation results, it is discovered that the impacts with high speed primarily determine the thickness of the modified layer implanted with residual stress during multiple impacts at different rates. According to residual stress implantation characteristics, the low-speed impact whose speed does not reach 50% of the maximum impact speed was defined as the ineffective impact. Besides, increasing the amplitude of ultrasonic vibration results in a significant increase in the maximum impact force and the effective impact frequency. The travel distance of needle impact has a considerable effect on the effective impact frequency, but it has little effect on the maximum impact force. Finally, it was concluded that the low air pressure plays a positive role in the needle impact. Furthermore, excessive air pressure hinders the needle impact and results in a decline in the effective impact frequency and the maximum impact force.

Keywords: Impact force; Needle impact; Residual stress; Ultrasonic shot peening.