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Experimental Research on High Frequency Vibratory Stress Relief Technology and Vibratory Stress Relief Set

Author: WangJianWu
Tutor: JiaShuShi；HeWen
School: Zhejiang University
Course: Mechanical Manufacturing and Automation
Keywords: VSR(vibratory stress relief) High frequency dislocation mechanism GMM(Giant Magnetostrictive material) ultrasonic residual stress
CLC: TG156.92
Type: Master's thesis
Year: 2005
Downloads: 193
Quote: 3
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Abstract

Vibration stress relief technology has such advantages as followed: fast disposing, saving in energy, clean and environmental protecting. Yet the mechanism of VSR was not fully identified, the criterion of distinguish is hard to determine. So this technology isn’t used widely in our country. The study on VSR is high valuable in scientific research and for industry purpose.This dissertation is combined with the project of National Natural Science Foundation of China—"Research on mechanism of three-dimensional, high frequency, microscopic viewed VSR and the related technology" (No.50305036). The mechanism of high frequency VSR and the R&D on VSR devices have been studied systematically both in theoretical analysis and experimental study. The dissertation consists of six chapters:In chapter 1, the background and significance of the research are introduced, the current research situations in and out of our country on VSR, are summarized, the limitation of studying on VSR is also introduced. Then the contents of this dissertation are proposed.In chapter 2, the mechanism of VSR is analyzed in this paper. The essential method of relieving residual stress is introduced on the basis of analyzing the mechanism of residual stress producing and relieving. From the view of stress-strain principle of the metal and micro-mechanics, the mechanism of VSR is analyzed and the process of stress relieving and evendistribution. The expression of VSR’s demand of micro-mechanics is given also.In chapter 3, the characteristic and mechanism of GMM are introduced. The driving principle of GMM Vibrator is analyzed, and then a kind of GMM vibrator is manufactured utilizing the effect of GMM. Operating principle, structural design and radiating method of GMM vibrator are also introduced. At last based on software ANSYS, distribution of magnetic field and request of work current are given. The result shows that the strength of magnetic field is homogeneous in the area of GMM, and the GMM works in linear range.In chapter 4, the characteristics of GMM vibrator’s power supply are introduced; The overall design method of the power supply is put forward, constant-current source circuit and AC source circuit are developed separately; experimental testing on power supply system is also carried out, including SNR and distortion factor measurement. The result shows the system performance coincides with the design criterion.In chapter 5, a series of experiments on the welded specimens were carried out. The measurement techniques of stress test by ultrasonic surface wave are introduced and the internal remanent stress of welded specimens is measured quantificationally before and after vibration. We analyze the test process and results systematically and then make a responding conclusion.In chapter 6, all achievements of the dissertation are summarized and the further research work, which will be done from now on, is put forward.

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