Search

Research on Tracing the Cycle Force Value of Fatigue Testing Machine Based on Linear Vibration Mechanics Model

Author(s)

Yu Wu1, Jing Yuan1,*, Rui Xue2, Yanfei Ren2, Ping Wu2

Affiliation(s)

1Chongqing Academy of Metrology and Quality Inspection, Chongqing, China 2Chongqing Airport Group CO., LTD.,Chongqing, China *Corresponding Author

Abstract

This study proposes a novel correction method that differs from the JJG556-2011 standard. By establishing an undamped three-degree-of-freedom (3-DOF) linear vibration mechanics model, the proposed method eliminates the need for measuring dynamic inertial displacement. Instead, the correction factor is derived analytically based on the measured inertial mass, the stiffness of the fatigue testing machine’s force sensor (i.e., the stiffness between the lower fixture and the base), and the operating frequency, thereby improving correction accuracy. Furthermore, by examining a locally equivalent damped single-degree-of-freedom (SDOF) linear vibration model, it was found that the difference between the correction factors obtained with and without damping consideration is merely 0.08%. Consequently, calibration results can be effectively corrected using the correction factor derived under undamped conditions without significant loss of precision.

Keywords

Cyclic Force Calibration; Correction Factor; Fatigue Testing Machine

References

[1] Hessling J. P. Dynamic calibration of uni-axial material testing machines[J]. Mechanical systems and signal processing, 2008, 22:451-466. [2] Dahlberg G. Dynamic calibration of fatigue testing machines[J]. In EUROLAB Proceedings of the International Workshop on Investigation and Verification of Materials Testing Machines, 2001, 89-99. [3] Hessling JP. Models of dynamic measurement error variations of material testing machines[J]. Mechanical Systems and Signal Processing, 2009, 23(8):2510-2518. [4] Siver C, Andrea E. 3D Printing with Flexible Materials-Mechanical Properties and Material Fatigue[J]. Macromolecular Symposia, 2021,395(1). [5] Norouzzadeh T E, Zheng F, Todd T, et. Stuctural monitoring and remaining fatigue life estimation of typical welded crack details in the Manhattan Bridge[J]. Engineering Structures, 2021,231. [6] Zhao Yemei. Performance Study and Structure Improvement of Electromagnetic Resonance type High Frequency Fatigue Testing Machine[D]. JILIN University , 2023. [7] Ni Jiaao. High frequency load electromagnetic excitation technology and application[D]. JILIN University , 2021. [8] General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China. JJG 556-2011. Axial Force Fatigue Testing Machines[S].Beijing, China, 2011.