Residual Stress Analysis of Ceramic Coating by Laser Ablation and Digital Holography

Pedrini, Giancarlo; Martínez-García, V.; Weidmann, P.; Wenzelburger, Martin; Killinger, Andreas; Weber, Ulrich; Schmauder, Siegfried; Gadow, R.; Osten, Wolfgang

doi:10.1007/s11340-015-0120-3

Cited by 30 publications

(13 citation statements)

References 28 publications

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“…Therefore, a convenient description of the material removal was achieved and the transfer into a FEM program could be eased. A more detailed description can be found in [7]. Despite the efforts, the resolution and deviation are not as good as the ones for classical IHD (Fig.…”

Section: Fig 2: Ablated Hole Shape For Spot Focused Laser Beam (Leftmentioning

confidence: 95%

Evaluation of Residual Stress Determinations Conducted with Laser Ablation and Optical Displacement Measurement

Schmauder

Killinger

Wenzelburger

et al. 2016

Residual Stresses 2016

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Abstract. The presented work is related to the determination of residual stresses in ceramic coatings, where the material removal is done by laser ablation and the occurring surface deformation is measured with digital holography. Insights into the underlying assumptions and calculations to determine the depth dependent stress values from extensive displacement measurements shall be given. Moreover, the inhomogeneous elastic material properties and deviations from idealized removal geometries (in this case holes and notches) have to be considered. To cover all involved fields, i.e. thermodynamics and continuum mechanics, numerical studies for conventional and laser hole drillings were conducted and the ablation process was simulated. As the laser cannot produce ideal cylindrical or rectangular geometries, appropriate mathematical approximations are applied to choose a representative profile of the removed material. Furthermore, the calculation of stresses based on full field displacement measurements is done with an own program in several depth increments. These calculations are based on numerical calibration data for the elastically inhomogeneous compound of coating and substrate. Especially notch-like forms of material removal, where case sensitive weighting functions are applied for evaluation, can lead to reliable results. The physical experiments were done on aluminium plates with applied alumina layers.

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Section: Fig 2: Ablated Hole Shape For Spot Focused Laser Beam (Leftmentioning

confidence: 95%

Evaluation of Residual Stress Determinations Conducted with Laser Ablation and Optical Displacement Measurement

Schmauder

Killinger

Wenzelburger

et al. 2016

Residual Stresses 2016

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“…An approach to avoid the mechanical drilling and the application of strain gauges, while a pulsed laser is used for the object machining leading to displacements produced by internal residual stresses is described in [16]. The displacements are measured by digital holography, and together with the hole shape and the material parameters are used for the calculation of the residual stress by finite element method (FEM).…”

Section: Residual Stress Evaluation In Ceramicmentioning

confidence: 99%

“…The displacements are measured by digital holography, and together with the hole shape and the material parameters are used for the calculation of the residual stress by finite element method (FEM). The implementation described in [16] was done under laboratory conditions. In this article, we describe the possibility of using digital holography and laser machining for determining residual stresses under industrial conditions.…”

Section: Residual Stress Evaluation In Ceramicmentioning

confidence: 99%

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Residual Stress Evaluation in Ceramic Coating Under Industrial Conditions by Digital Holography

Alekseenko

Pedrini

Martínez-García

et al. 2020

IEEE Trans. Ind. Inf.

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In this article, we describe a system suitable for the evaluation of residual stress in ceramic coating under industrial conditions. Laser ablation is used for material removal, and digital holography measures the displacements produced by the residual stress release around the processed area. The residual stresses at different depths below the surface of the coating are calculated by finite element method from the displacements, the shapes of the machined surface, and the material parameters. Experimental results are presented. Index Terms-Ceramic coating, digital holography residual stress. I. INTRODUCTION C ERAMIC coatings are commonly used to improve the wear or heat resistance of technical components or to provide electrically nonconductive surfaces [1]. The spraying techniques usually used for coating [2] induce unwanted residual

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“…The presented analysis of laser radiation conversion in the interferometer may improve phase unwrapping of interferometric fringes [13] or multistep phase-shift extraction [14,15]. The method can be applied to uncertainty precalculation before experimental implementation of digital methods as digital holographic interferometry [16,17] or digital speckle interferometry [11]. Thereby, the studied method is not limited to displacement measurements, and can be applied to optimize phase relationships in any interferometric schemes with diffractive or holographic elements.…”

Section: Introductionmentioning

confidence: 99%

Phase Imbalance Optimization in Interference Linear Displacement Sensor with Surface Gratings

Одиноков

Shishova

Kovalev

et al. 2020

Sensors

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In interferential linear displacement sensors, accurate information about the position of the reading head is calculated out of a pair of quadrature (sine and cosine) signals. In double grating interference schemes, diffraction gratings combine the function of beam splitters and phase retardation devices. Specifically, the reference diffraction grating is located in the reading head and regulates the phase shifts in diffraction orders. Measurement diffraction grating moves along with the object and provides correspondence to the displacement coordinate. To stabilize the phase imbalance in the output quadrature signals of the sensor, we propose to calculate and optimize the parameters of these gratings, based not only on the energetic analysis, but along with phase relationships in diffraction orders. The optimization method is based on rigorous coupled-wave analysis simulation of the phase shifts of light in diffraction orders in the optical system. The phase properties of the reference diffraction grating in the interferential sensor are studied. It is confirmed that the possibility of quadrature modulation depends on parameters of static reference scale. The implemented optimization criteria are formulated in accordance with the signal generation process in the optical branch. Phase imbalance and amplification coefficients are derived from Heydemann elliptic correction and expressed through the diffraction efficiencies and phase retardations of the reference scale. The phase imbalance of the obtained quadrature signals is estimated in ellipticity correction terms depending on the uncertainties of influencing parameters.

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Residual Stress Analysis of Ceramic Coating by Laser Ablation and Digital Holography

Cited by 30 publications

References 28 publications

Evaluation of Residual Stress Determinations Conducted with Laser Ablation and Optical Displacement Measurement

Evaluation of Residual Stress Determinations Conducted with Laser Ablation and Optical Displacement Measurement

Residual Stress Evaluation in Ceramic Coating Under Industrial Conditions by Digital Holography

Phase Imbalance Optimization in Interference Linear Displacement Sensor with Surface Gratings

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