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He Wen
Ma Zhenyu
Wang Xingli
College of Mechanical and
Energy Engineering,
Zhejiang University,
Hangzhou 310027, China |
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TECHNOLOGY OF
QUANTITATIVE
ANALYSIS ON
VIBRATORY STRESS
RELIEF BASED ON ULTRASONIC
TIME-OF-ARRIVAL METHOD*
Abstract:
The effect of vibratory stress relief (VSR) is usually evaluated with the indirect method of observing the change of amplitude frequency response characteristics of structures. A new kind of evaluating method of VSR based on the ultrasonic time-of-arrival method (UTM), which can obtain the residual stress directly through measuring the propagation time of ultrasonic wave in the material, is presented. At first, the principle of the measuring method of residual stress based on UTM is analyzed. Then the measuring system of the method is described, which is in virtue of ultrasonic flaw detector and high-sampling-rate digital oscillograph. And a set of calibration system that contains a piece of standard specimen is also introduced. Experimental results prove the relation between the residual stress and the propagation time of ultrasonic in workpieces. Finally, the measuring and calibration systems are applied in evaluating the effect of VSR. The final test results show that the method is effective.
Key words:
Ultrasonic time-of-arrival method Residual stress Measure Vibratory stress relief |