Determination of residual stresses using laser-generated surface skimming longitudinal waves

Bescond, C.; Monchalin, Jean‐Pierre; Lévesque, Daniel; Gilbert, A.; Talbot, Richard; Ochiai, Makoto

doi:10.1117/12.620374

Cited by 16 publications

(5 citation statements)

References 12 publications

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“…For residual stress, the method is based on monitoring the small velocity change produced by the stress of the laser generated surface skimming longitudinal wave (LSSLW or P-wave). This wave propagates just below the surface and is found much more sensitive to stress than Rayleigh wave (SAW) [16]. The residual stress profile measured across the weld line is compared to results from numerical simulations and strain gauge measurements.…”

Section: Figure 1 Near Herementioning

confidence: 99%

Laser ultrasonics for defect detection and residual stress measurement of friction stir welds

Lévesque

Dubourg

Blouin

2011

Nondestructive Testing and Evaluation

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Section: Figure 1 Near Herementioning

confidence: 99%

Laser ultrasonics for defect detection and residual stress measurement of friction stir welds

Lévesque

Dubourg

Blouin

2011

Nondestructive Testing and Evaluation

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“…Bescond et al measured residual stress of metal shot peening using laser generated surface skimming longitudinal wave. The influence of surface roughness can be reduced and the stress measurement accuracy can be improved [18]. Levesque et al investigated laser ultrasound technique for residual stress measurement in friction stir welding.…”

Section: Introductionmentioning

confidence: 99%

Study on the Effect of Scanning Strategy on Residual Stress in Laser Additive Manufacturing with the Laser Ultrasound Technique

et al. 2021

Exp Mech

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Background During the laser additive manufacturing (LAM) process large temperature gradients can form, generating a mismatch in deformation that can lead to high level of residual stress. The stress can have irreversible effects such as warping and cracking of parts during and post manufacturing. Objective One of the most important LAM parameters that should be controlled carefully in order to effectively manage residual stress is the scanning strategy. This study presents an evaluation of six different scanning strategies, namely reciprocating, 90° reciprocating, line, screwing, reciprocating overlapping and island scanning strategies with respect to their effect on residual stress. Methods Laser ultrasound technology, as an advanced nondestructive testing method, is applied to measure the residual stress distribution under different scanning strategies for the first time. The surface wave generated by laser is used to evaluate the plane stress state within the surface layer of the specimen. ResultsThe results show that the island scanning strategy is found to contribute to the least average residual stress, and lowered residual stress by up to 45% relative to the line scanning strategy. The overall stress level is island < reciprocation overlapping < screwing < 90° reciprocating < reciprocating < line. Further to this, the effect of inspection path on the results of residual stress measurement is discussed and the concept of optimal inspection path is proposed for the first time. Conclusions Laser ultrasound method can effectively measure the residual stress in laser additive manufacturing, and the research can serve as useful guidelines for engineers and designers to restrain and evaluate residual stress in LAM.

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“…For residual stress, the method is based on monitoring the small velocity change produced by the stress of the laser generated surface skimming longitudinal wave (LSSLW). This wave propagates just below the surface and is found much more sensitive to stress than Rayleigh wave (SAW) [3]. The residual stress profile measured across the weld line is compared with results from numerical simulations and strain gauge measurements.…”

Section: Introductionmentioning

confidence: 99%

Residual Stress Measurement in Friction Stir Welds Using Laser Ultrasonics

Lévesque¹,

Dubourg²,

Lord³

et al. 2009

AIP Conference Proceedings

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The laser-ultrasonic technique is proposed for defect detection and residual stress measurement in friction stir welds (FSW). When combined with the synthetic aperture focusing technique (F-SAFT), very good performances are achieved for detecting lack of penetration in butt joints, the detection limit coinciding with the conditions of reduced mechanical properties. Also, the detection of kissing bonds seems to be possible in lap joints with frequencies up to 200 MHz. Another application is the measurement of residual stresses induced by the FSW process. The method is based on monitoring the velocity change of the laser generated surface skimming longitudinal wave, propagating just below the surface and being found much more sensitive to stress. The residual stress profile measured across the weld line is in good agreement with results from a finite element model and from strain gauge measurements.

show abstract

Determination of residual stresses using laser-generated surface skimming longitudinal waves

Cited by 16 publications

References 12 publications

Laser ultrasonics for defect detection and residual stress measurement of friction stir welds

Laser ultrasonics for defect detection and residual stress measurement of friction stir welds

Study on the Effect of Scanning Strategy on Residual Stress in Laser Additive Manufacturing with the Laser Ultrasound Technique

Residual Stress Measurement in Friction Stir Welds Using Laser Ultrasonics

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