Abstract
The current research based on vibratory stress relief (VSR) is focused on low frequency excitation, but it is seldom mentioned for complex thin-walled workpiece with higher natural frequency. In this paper, the mechanism of high frequency VSR is studied by microdynamic theory. Aiming at the rotating frame of complex thin-walled workpiece in aerospace equipment, the high frequency VSR numerical simulation is carried out by finite element software Abaqus, the modal analysis technology and harmonic response analysis technology are proposed, and the exciting force, excitation frequency and other important parameters are determined. The simulation results are analyzed to verify the superiority of high frequency VSR to eliminate residual stresses of complex thin-walled workpieces, and provide a theoretical basis for optimal selection of excitation parameters for high frequency VSR.
Highlights
Complex thin-wall workpiece has the characteristics of light weight, high strength and so on, and is widely used in aerospace and military industry
These researches are mainly focused on the traditional low frequency vibratory stress relief (VSR), whose excitation frequency is less than 200Hz, which is seldom involved in high frequency VSR of complex thin-walled workpieces with high natural frequencies
The analysis shows that the bending vibration mode of the seventh order is selected as the initial vibration mode of the high frequency VSR, the natural frequency value is 1151.7Hz, three-point support is adopted, the supporting point of the VSR excitation is arranged in three directions of zero displacement near the circular hole
Summary
Complex thin-wall workpiece has the characteristics of light weight, high strength and so on, and is widely used in aerospace and military industry. The domestic professor Song Tianmin explained the mechanism of VSR by experiment from the angle of energy transformation in dislocation motion [5]. These researches are mainly focused on the traditional low frequency VSR, whose excitation frequency is less than 200Hz, which is seldom involved in high frequency VSR of complex thin-walled workpieces with high natural frequencies. Based on the theoretical study of the mechanism of high frequency VSR, aiming at the key parts of aerospace equipment, a modeling and simulation technology of high frequency VSR for complex thin-walled workpiece is proposed, through modal analysis and harmonic response analysis of finite element model of workpiece, the maximum dynamic stress of structure is calculated, the relationship curve between the maximum dynamic stress of structure and excitation frequency and amplitude of excitation force is established, and the high frequency VSR parameters are determined, which can be used to guide the practical engineering application
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