Research on an Ultrasonic Longitudinal Critically Refracted Wave Detection Method for the Depth Distribution of Stress

Lu, Yuren; Xu, Caixia; Pan, Qinxue; Li, Dezhi

doi:10.3390/met12101602

Cited by 6 publications

(2 citation statements)

References 34 publications

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“…For regular ultrasonic defect inspection, surface roughness led to strong signal noise [35,36], making it difficult to identify the signal of cracks [37]. Therefore, in the research on LCR versus residual stress, the tested specimens were mechanically ground or machined to eliminate the effect of surface roughness [38,39]. However, the surface of a workpiece may not be flat or polished.…”

Section: Surface Roughnessmentioning

confidence: 99%

Effects of factors from practical workpieces on ultrasonic LCR method stress measurement

Lai,

Yan,

Chang

et al. 2024

Discov Appl Sci

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The non-destructive stress measurement method is the main trend in residual stress analysis. The ultrasonic method, which utilizes the acoustoelastic effect of the longitudinal critically refracted (LCR) wave, is one of the time-saving measurement techniques. During the practical stress measurement on a workpiece, various external factors may impact the transmission of acoustic waves and the resulting stress value. This study revealed and discussed the effects of four factors on the LCR wave: surface roughness of the examined material, temperature of the material, external mechanical vibration, and surface paint. The stress coefficient was determined by comparing the offset time of the acoustic wave with the stress measured by X-ray analyzer in the zero-stress specimens, which had undergone annealing and deep cryogenic treatment. The test results indicated that the surface roughness did not affect the transition time of the acoustic wave, but it did decrease the intensity of the signal. The increase in temperature and the transition time of the acoustic wave were in a linear relationship. Mechanical vibrations from the environment would not affect the transition time or signal intensity of the acoustic wave, whereas the application of surface paint increased the transition time. Although the effect of paint on the actual workpiece could not be easily modified during stress measurement, the ultrasonic method was still suitable for monitoring the stress of a specific position of the workpiece throughout its operational lifetime. The experiment data in this study were applied to measuring the residual stress of an aluminum ship component, and the result showed a good correspondence with X-ray stress analyzer results.

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Section: Surface Roughnessmentioning

confidence: 99%

Effects of factors from practical workpieces on ultrasonic LCR method stress measurement

Lai,

Yan,

Chang

et al. 2024

Discov Appl Sci

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show abstract

“…1 Schematic diagram of ultrasonic stress detectionWhen the distance L, width W and frequency f of the excitation and receiver transducers are fixed, the average stress can be solved. With reference to the simplified model derived by Lu[41], the stress detection values can be expressed as follows:…”

mentioning

confidence: 99%

Ultrasonic stress detection and regulation in the whole machining process of thin-walled part

Jia,

Lu,

Song

et al. 2024

Preprint

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Thin-walled aerospace parts have the characteristics of large size, thin wall thickness and complex shape, etc. In the process of machining, poor rigidity and high material removal rate are easy to cause machining deformation due to uneven distribution of residual stress, and conventional detection methods and regulation means can not meet the needs of on-site production. In order to solve these problems, an effective method of ultrasonic nondestructive in-situ stress detection and ultrasonic stress regulation is proposed in this paper. Firstly, the ultrasonic residual stress detection and ultrasonic stress regulation are analyzed theoretically, and their working principles are explained, which provides a theoretical basis for the subsequent use of the equipment. Then, according to the deformable sections of large thin-walled parts in the production site, the typical characteristics are extracted to complete the design of the experimental part, and the residual stress detection and regulation of the whole machining process are studied. Finally, through two groups of comparison experiments, the changes of residual stress values in different depth ranges of parts and the changes of the flatness of the final parts are analyzed. The results show that the ultrasonic critical refraction longitudinal wave (LCR wave) method can be used to detect the residual stress of thin-walled parts in different depth ranges, and the ultrasonic stress regulation method can reduce and homogenize the stress of thin-walled parts, and the machining deformation and conformal ability of the parts are significantly improved after the stress regulation.

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Ultrasonic stress detection and regulation in the whole machining process of thin-walled part

Jia,

Lu,

Song

et al. 2024

Int J Adv Manuf Technol

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Research on an Ultrasonic Longitudinal Critically Refracted Wave Detection Method for the Depth Distribution of Stress

Cited by 6 publications

References 34 publications

Effects of factors from practical workpieces on ultrasonic LCR method stress measurement

Effects of factors from practical workpieces on ultrasonic LCR method stress measurement

Ultrasonic stress detection and regulation in the whole machining process of thin-walled part

Ultrasonic stress detection and regulation in the whole machining process of thin-walled part

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