Design Theory and Experimental Research of Ultrasonic Fatigue Test

Ning Feng; Xin Wang; Jiazheng Guo; Qun Li; Jiangtao Yu; Xuecheng Zhang

doi:10.3390/machines10080635

Machines (Jul 2022)

Design Theory and Experimental Research of Ultrasonic Fatigue Test

Ning Feng,
Xin Wang,
Jiazheng Guo,
Qun Li,
Jiangtao Yu,
Xuecheng Zhang

Affiliations

Ning Feng: School of Mechanical and Aerospace Engineering, Jilin University, Changchun 130025, China
Xin Wang: School of Mechanical and Aerospace Engineering, Jilin University, Changchun 130025, China
Jiazheng Guo: School of Mechanical and Aerospace Engineering, Jilin University, Changchun 130025, China
Qun Li: School of Mechanical and Aerospace Engineering, Jilin University, Changchun 130025, China
Jiangtao Yu: School of Mechanical and Aerospace Engineering, Jilin University, Changchun 130025, China
Xuecheng Zhang: School of Mechanical and Aerospace Engineering, Jilin University, Changchun 130025, China

DOI: https://doi.org/10.3390/machines10080635
Journal volume & issue: Vol. 10, no. 8
p. 635

Abstract

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Ultrasonic fatigue testing is a key technology that is more efficient and energy saving compared to conventional fatigue testing. In order to investigate the behavior of metallic materials at ultra-high frequencies and to verify the validity of ultrasonic fatigue test results, this paper builds a test apparatus that can be used to conduct ultrasonic fatigue tests, and this paper proposes a complete procedure from theoretical analysis to the investigation of test laws for 20 kHz tensile and the compression test. Firstly, the initial sizes of the sample are calculated with an analytical method, then the three-dimensional model is simulated and optimized with finite element software, and the optimum result for the sample size is then obtained according to the sensitivity of the sample size to the effect of frequency. The next step is to analyze the influenced trend of the sample size, including L1, L2, L3, R1 and R2, on the resonant frequency and maximum stress of the sample. According to the optimized results, the sample was processed, and an ultrasonic fatigue test was carried out to ensure the sample fatigue fracture finally occurred. Finally, the S-N curve of the material was plotted based on the data recorded in the test and compared with the conventional fatigue life curve to verify the feasibility of the ultrasonic fatigue test device and test method. The fracture of the sample was observed using an optical microscope, and its macroscopic fracture morphology was analyzed. The fracture morphology of the sample can be divided into three typical zones: the fatigue crack source zone, the extension zone and the transient zone, where the fatigue cracks all originate from on the surface of the sample. The results demonstrate the validity of the ultrasonic fatigue test results and provide new ideas for the design and optimization of ultrasonic fatigue samples and shorter processing times, providing a reference for subsequent ultrasonic fatigue tests on typical materials.

Published in Machines

ISSN: 2075-1702 (Online)
Publisher: MDPI AG
Country of publisher: Switzerland
LCC subjects: Technology: Mechanical engineering and machinery
Website: http://www.mdpi.com/journal/machines

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