Residual Stress Measurement by ESPI Hole-Drilling

Rickert, Theo J.

doi:10.1016/j.procir.2016.02.256

Cited by 18 publications

(10 citation statements)

References 6 publications

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“…RS can be defined as the stresses that remain in the body, in equilibrium, without external loads. The application of mechanical, thermal or thermochemical processes can generate RS, such as mechanical forming processes, machining processes, casting processes, welding and heat treatments (Ghasemi and Mohammadi, 2016;Rickert, 2016;Rossini et al, 2012;Seifi and Salimi-Majd, 2012).…”

Section: Introductionmentioning

confidence: 99%

Residual stress profile determination by the hole-drilling method with calibration coefficients obtained using FEM

Corrêa¹,

Jahnert²,

Tomás³

2021

Journal of Theoretical and Applied Mechanics

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Residual Stresses (RS) in mechanical components can be undesirable, and their accurate identification can prevent component damage. There are many semi-destructive methods for determination of RS. The hole-drilling method offers many advantages when compared to other methods due to its practicality, applicability to different materials, and low-cost execution. According to the American Society for Testing and Materials (ASTM) E837--13a Standard, the RS are assumed to be constant at each depth level when employing the hole-drilling method. Thus, calibration coefficients are necessary to calculate stress values at each level using the relaxed strains measured on the component surface, as incremental drillings are performed. However, the coefficients provided by the Standard were obtained using a coarsely-discretized 2D finite element model. This work aims to find new calibration coefficients based on the linear elasticity theory and using the Finite Element Method (FEM) with a refined mesh. A numerical model consisting of linear tetrahedral finite elements was constructed to simulate the resulting strains, as unitary stresses are applied at each depth level of the component inner surface. Using this method, two matrices of calibration coefficients are obtained, one related to normal stresses, and another related to shear stresses. The results show that the RS obtained using the new coefficients presented a 3.9% relative average error compared to analytical values in the four experiments conducted, while the ASTM Standard coefficients resulted in a 9.7% relative average error.

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Section: Introductionmentioning

confidence: 99%

Residual stress profile determination by the hole-drilling method with calibration coefficients obtained using FEM

Corrêa¹,

Jahnert²,

Tomás³

2021

Journal of Theoretical and Applied Mechanics

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“…Because of this, a novel measurement method based on the Electronic Speckle Pattern Interferometry (ESPI) combined with the hole drilling technique has been recently used [18][19][20]. ESPI is an optical measurement method that produces displacement data from the object surface before the object has been deformed (reference object) and after deformation has occurred.…”

Section: Introductionmentioning

confidence: 99%

Experimental and numerical analysis of the residual stress distribution in a three-point bending test of a TRIP sheet by using ESPI

Díaz-Mendoza

Capilla-González

Martínez-Ramírez

et al. 2020

J Braz. Soc. Mech. Sci. Eng.

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In sheet metal forming, residual stresses are related to springback and material failure after the deformation process or during service due to load history. Thus, being able to either calculate or measure such stresses is of great importance. This paper aims to evaluate the use of the Electronic Speckle Pattern Interferometry (ESPI) technique to measure residual stresses on TRIP steel. Residual stresses are measured after springback on specimens used in three-point bending tests; where three bending angles are considered. Experiments are compared with Finite Element calculations in terms of punch force, springback angle and residual stresses. Work-hardening and anisotropy parameters, used in simulations, are experimentally determined by the uniaxial tensile test. Results indicate that advanced hardening models are necessary to increase the accuracy of springback predictions. Nevertheless, residual stress calculations show a good correlation with experimental values. Also, it was proved that ESPI is a powerful technique to measure the residual stress on complex surfaces, as the ones typically encountered in sheet forming processes. Future work includes residual stress predictions for different forming processes.

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“…Optical interferometric techniques are widely used for residual stress analyses in conjunction with semi-destructive techniques such as the sectioning, hole drilling, and contour methods. [5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20]. In these methods, the material around a residually stressed area is removed step by step.…”

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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Residual Stress Measurement by ESPI Hole-Drilling

Cited by 18 publications

References 6 publications

Residual stress profile determination by the hole-drilling method with calibration coefficients obtained using FEM

Residual stress profile determination by the hole-drilling method with calibration coefficients obtained using FEM

Experimental and numerical analysis of the residual stress distribution in a three-point bending test of a TRIP sheet by using ESPI

Effect of Residual Stress on Thermal Deformation Behavior

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