Local zone wise elastic and plastic properties of electron beam welded Ti–6Al–4V alloy using digital image correlation technique: A comparative study between uniform stress and virtual fields method

Saranath, K.M.; Ramji, M.

doi:10.1016/j.optlaseng.2015.01.005

Cited by 38 publications

(14 citation statements)

References 34 publications

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“…With the calculated strain field, the F-VFM introduced in Section 3.3 is applied to identify the modulus distribution of the repaired structure. Because the order of Fourier series function (N) defined in Equation 9 should be determined according to the loading configuration, identification results for different values of N (5,10,15,20,25) are provided in Figure 7.…”

Section: Simulated Experimentsmentioning

confidence: 99%

“…From the available reports, the VFM has been successfully applied in the mechanical characterisation of heterogeneous structures combining with optical measurement techniques. [14][15][16] Furthermore, based on the VFM, a Fourier-series-based VFM (F-VFM) [17][18][19] has been developed, which is able to identify the mechanical properties of heterogeneous structures when the material distribution of the structure is unknown. For the laser repaired materials, because the elastic modulus of the repaired zone is different from that of the base material, F-VFM is promising to identify the modulus distribution of laser repaired structures.…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Simulated Experimentsmentioning

confidence: 99%

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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“…Recently investigators have incorporated DIC obtained full‐field strains into a new method known as the Virtual Field Method (VFM), initially developed by Pierron et al [ 10 ] to obtain the distributions of mechanical properties in a heterogeneous weldment. [ 11–15 ] The main advantage of the VFM method is that the stress distribution along the cross‐section of a specimen does not need to be uniform. Therefore, while the VFM method is found to produce comparable results to relatively simpler unified stress method (USM) in case of simple tensile loading, the VFM method yields more accurate results in case of bending where the stress distribution along a cross‐section is non‐uniform.…”

Section: Introductionmentioning

confidence: 99%

“…Therefore, while the VFM method is found to produce comparable results to relatively simpler unified stress method (USM) in case of simple tensile loading, the VFM method yields more accurate results in case of bending where the stress distribution along a cross‐section is non‐uniform. [ 14,15 ]…”

Section: Introductionmentioning

confidence: 99%

Tensile deformation behaviour of a dissimilar metal weldment of P91 and 347H steels

Akanda

Wheeler

Rozman

et al. 2020

Strain

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Deformation of a weldment is governed by the mechanical properties of its base metals and fusion zone. In a weldment, the base metals and fusion zone exhibit changing microstructural features with various phases present along the weldment. Specifically, the heat affected zone of a base metal exhibits a heterogeneous microstructure generated during weld thermal cycles and by post‐weld heat treatment. As a result, the mechanical properties in a weldment are often non‐uniformly distributed. In this study, tensile tests combined with digital image correlation were performed to obtain the non‐uniform distributions of the mechanical properties of a weldment composed of P91 and 347H steels. From the experimental tensile tests, it was found that the 347H base metal had significantly distinct mechanical properties compared to the other zones of the weldment. Furthermore, the 347H base metal had the lowest yield stress but the highest strain hardening exponent. Because of its lowest yield stress, the 347H base metal had the highest plastic strain accumulation at any stage of global deformation. However, the strain hardening rate of the P91 base metal enabled it to accumulate the necessary plastic strain to activate its necking first. Therefore, the failure location of the P91‐347H weldment was expected to occur at the P91 base metal. A 3D finite element simulation of the tensile deformation of P91‐347H weldment also suggested the same. However, from the present experimental observations, one weldment out of three was found to fail unexpectedly at the heat affected zone of the P91 base metal. The reason for this unexpected failure was determined by microscopic analysis to be the presence of a large defect.

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“…The three-dimensional Digital Image Correlation (3D DIC) technique can be used to detection of local deformations and displacements in areas of geometric discontinuity and heterogeneity of material, among others allows for the detection of cracks on the surfaces of objects studied. This method also allows for measuring surface deformation and analyzing the mechanical properties of various materials such as steel [12], aluminum [1, 13÷14], titanium [15] and composites [16]. Obvious advantages of this method are non-contact measurements, high sensitivity measurements can determine the displacements and strains in any area of the measurement zone, the measurement range starting from nanoscale and give the possibility of measurements on the real constructions in exploitation time [17].…”

Section: Introductionmentioning

confidence: 99%

Application of the 3D Digital Image Correlation to the Analysis of Deformation of Joints Welded With the FSW Method After Shot Peening

Trzepieciński

Bucior

Kluz

et al. 2019

Advances in Materials Science

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The three dimensional Digital Image Correlation (3D DIC) method is used for measurements of deformations and displacement in plane elements exposed to loading. The paper presents the experimental tests of an application of the ARAMIS system to the analysis of deformation of joints welded with the FSW method after shot peening treatment. The butt joints were made of 2024-T3 aluminum alloy sheets with the thickness of 1 mm, which next were peened with glass beads about granulation in range 500 ÷ 900 µm. Tests of residual stresses by X-ray diffraction were also carried out. The aim of the study was to analyze the impact of shot peening on the value of stresses and the location of deformations in butt joints.

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Local zone wise elastic and plastic properties of electron beam welded Ti–6Al–4V alloy using digital image correlation technique: A comparative study between uniform stress and virtual fields method

Cited by 38 publications

References 34 publications

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

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

Tensile deformation behaviour of a dissimilar metal weldment of P91 and 347H steels

Application of the 3D Digital Image Correlation to the Analysis of Deformation of Joints Welded With the FSW Method After Shot Peening

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