Recent Applications of Moiré Interferometry

Ifju, Peter; Han, Bongtae

doi:10.1007/s11340-010-9404-9

Cited by 49 publications

(22 citation statements)

References 142 publications

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“…For monitoring and inspecting these critical structures, a variety of approaches are available [1][2][3][4][5], among which the most widespread concerns the application of ultrasound. Besides the classical ultrasonic C-scan, which has already proven its usefulness in detecting defects, delaminations as well as material heterogeneities, several more advanced techniques can quantitatively monitor the mechanical performance in order to ensure the designed functionality of a composite structure.…”

Section: Introductionmentioning

confidence: 99%

Identification of the Elastic Properties of Isotropic and Orthotropic Thin-Plate Materials with the Pulsed Ultrasonic Polar Scan

et al. 2014

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Already in the early 1980's, it has been conjectured that the pulsed ultrasonic polar scan (P-UPS) provides a unique fingerprint of the underlying mechanical elasticity tensor at the insonified material spot. Until now, that premise has not been thoroughly investigated, nor validated, despite the opportunities this would create for NDT and materials science in general. In this paper, we report on the first-ever implementation of an inverse modeling technique on the basis of a genetic optimization scheme in order to extract quantitative information from a P-UPS. We validate the optimization approach for synthetic data, and apply it to experimentally obtained polar scans for annealed aluminum, cold rolled DC-06 steel as well as for carbon fiber reinforced plastics. The investigated samples are plate-like and do not require specific preparation. The inverted material characteristics show good agreement with literature, micro-mechanical models as well as with results obtained through conventional testing procedures.

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Section: Introductionmentioning

confidence: 99%

Identification of the Elastic Properties of Isotropic and Orthotropic Thin-Plate Materials with the Pulsed Ultrasonic Polar Scan

et al. 2014

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“…With the development of the full‐field optical technique and image processing method, various two‐step identification approaches in which the optical technique is combined with an inverse method have been developed to enable the identification of multiple constitutive model parameters using a single heterogeneous deformation field . Under the two‐step approach, a heterogeneous deformation field is obtained using one of a number of different optical methods, including the grid method, digital image correlation (DIC), moiré interferometry (MI), electronic speckle pattern interferometry (ESPI), and coherent gradient sensing (CGS) . The resulting displacement or corresponding strain field is then input into an inversion program to identify the constitutive model parameters.…”

Section: Introductionmentioning

confidence: 99%

An identification method of mechanical properties of materials based on the full‐field measurement method based on the fringe pattern

Zhou

Xie

2019

Strain

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With the development of image processing technology, optical methods based on fringe patterns, for example, the grid method, electronic speckle pattern interferometry, moiré techniques (including moiré interferometry and digital moiré), and coherent gradient sensing, have become useful techniques for measuring the full-field deformation of materials and structures. An important application of these techniques is to offer deformation fields for extracting constitutive parameters in the inverse methods. In this paper, we proposed a novel inversion method based on fringe patterns (IMFP), which can be used to identify constitutive model parameters by comparing simulated fringe patterns obtained using the finite element method with experimentally measured fringe patterns. The feasibility and identification accuracy of IMFP were evaluated through numerical experiments, and an additional series of numerical tests were conducted to analyse the noise immunity of IMFP and its sensitivity to the number of constitutive model parameters. Finally, IMFP was applied in the identification of the mechanical parameters of selective laser melting three-dimensional printed stainless steel. KEYWORDS fringe patterns, identification method based on the fringe patterns, inverse method, optical methods

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“…Moiré interferometry has the advantages of full-field measurement and high accuracy. Also, it has been successfully applied in many fields, [21] including the welding. [22] Besides, the feasibility of combining moiré interferometry with the VFM has been verified in the existing work.…”

Section: Introductionmentioning

confidence: 99%

Fourier‐series‐based virtual fields method combining with moiré interferometry for characterising elastic modulus distribution of laser repaired GH4169

Cao

Xie

Wang

2018

Strain

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Laser cladding is an effective technology for repairing damaged components with high efficiency and low cost. Characterisation for the mechanical properties of the repaired structure is of great importance to evaluate its reliability. In this study, the mechanical properties of laser repaired GH4169 are investigated by Fourier‐series‐based virtual fields method and moiré interferometry. The elastic modulus distribution of the whole structure is identified to understand the mechanical performance of the repaired zone and base material. A uniaxial tensile test is performed and the full‐field deformation is measured by moiré interferometry. With the measured strain field, the distribution of modulus in repaired structures can be calculated. In addition, simulation experiments of moiré interferometry are conducted to optimise the parameters of Fourier‐series‐based virtual fields method to improve the accuracy of the proposed method. On the basis of these results, experiments on the repaired GH4169 material are performed and the variation of modulus in the whole structure is identified. The results verify that the proposed method is effective for characterising modulus distribution of the laser repaired structures, and will have a good prospect for further application.

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Recent Applications of Moiré Interferometry

Cited by 49 publications

References 142 publications

Identification of the Elastic Properties of Isotropic and Orthotropic Thin-Plate Materials with the Pulsed Ultrasonic Polar Scan

Identification of the Elastic Properties of Isotropic and Orthotropic Thin-Plate Materials with the Pulsed Ultrasonic Polar Scan

An identification method of mechanical properties of materials based on the full‐field measurement method based on the fringe pattern

Fourier‐series‐based virtual fields method combining with moiré interferometry for characterising elastic modulus distribution of laser repaired GH4169

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