Optical Analysis of Residual Stress with Minimum Invasion

Yoshida, S.; Miura, Fumiya; Sasaki, Tomohiro; Didie, Daniel; Rouhi, Shahab

doi:10.1007/978-3-319-62899-8_11

Cited by 3 publications

(3 citation statements)

References 5 publications

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“…A similar analysis was made for an aluminum alloy specimen [29]. The specimen used in this experiment was a bead-on-plate aluminum alloy 5083 [30] processed by gas tungsten arc (TIG) welding.…”

Section: Bead-on-plate Welding On Al 5083mentioning

confidence: 99%

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Opto-Acoustic Technique for Residual Stress Analysis

Yoshida¹,

Sasaki²

2020

New Challenges in Residual Stress Measurements and Evaluation

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Residual stress analysis based on co-application of acoustic and optical techniques is discussed. Residual stress analysis is a long-standing and challenging problem in many fields of engineering. The fundamental complexity of the problem lies in the fact that a residual stress is locked into the material and therefore hidden inside the specimen. Thus, direct measurement of residual stress in a completely nondestructive fashion is especially difficult. One possible solution is to estimate residual stress from the change in the elastic constant of the material. Residual stress alters the interatomic distance significantly large that the elastic constant is considerably different from the nominal value. From the change in the elastic constant and knowledge of the interatomic potential, it is possible to estimate the residual stress. This acoustic technique (acoustoelasticity) evaluates the elastic modulus of the specimen via acoustic velocity measurement. It is capable of determining the elastic modulus absolutely, but it is a single-point measurement. The optical technique (electronic speckle pattern interferometry, ESPI) yields full-field, two-dimensional strain maps, but it requires an external load to the specimen. Co-application of the two techniques compensates each other's shortfalls.Keywords: acoustoelasticity, electronic speckle pattern interferometry, scanning acoustic microscopy, finite element modeling of residual stress, nondestructive residual stress analysis, heat-induced residual stress

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Section: Bead-on-plate Welding On Al 5083mentioning

confidence: 99%

“…The deformation was made permanent when the strain exceeded a preset yield strain. More about this modeling can be found in [29]. Figure 13 compares the results from the above four types of analyses.…”

Section: Acoustic Optical and Xrd Measurementsmentioning

confidence: 99%

Opto-Acoustic Technique for Residual Stress Analysis

Yoshida¹,

Sasaki²

2020

New Challenges in Residual Stress Measurements and Evaluation

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“…In our case, ESPI measures the in-plane displacement that object points undergo in response to an external load. Since the stress due to the external load is uniform over the specimen (because the load is static), the resultant strain (differential displacement) is greater than the nominal value if the elastic modulus is lowered by a tensile residual stress [23][24][25]. Conversely, the resultant strain is less if the elastic constant is elevated by compressive residual stress.…”

Section: Introductionmentioning

confidence: 99%

Effect of Residual Stress on Thermal Deformation Behavior

et al. 2019

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This paper discusses a non-destructive measurement technique of residual stress through optical visualization. The least amount of deformation possible is applied to steel plates by heating the specimens +10 °C from room temperature for initial calibration, and the thermal expansion behavior is visualized with an electronic speckle pattern interferometer sensitive to two dimensional in-plane displacement. Displacement distribution with the thermal deformation and coefficient of thermal expansion are obtained through interferometric fringe analysis. The results suggest the change in the thermal deformation behavior is affected by the external stress initially applied to the steel specimen. Additionally, dissimilar joints of steel and cemented carbide plates are prepared by butt-brazing. The residual stress is estimated based on the stress dependence of thermal expansion coefficient.

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