Analysis of the effects of process parameters in residual stress measurements on Titanium plates by HDM/ESPI

Barile, Claudia; Casavola, Caterina; Pappalettera, Giovanni; Pappalettere, Carmine

doi:10.1016/j.measurement.2013.11.014

Cited by 32 publications

(18 citation statements)

References 12 publications

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“…Some of these works use HDM as validation of nondestructive techniques such as ultrasonic [41][42][43][44][45][46], XRD [30] and neutron diffraction [31]. Pappalettere et al [47][48][49][50][51][52] applied an electronic speckle pattern interferometry (ESPI) method to avoid the use of conventional rosette strain gauges. The ESPI is based on the correlation between two speckle patterns, each one created by the interference between a reference beam and the image of an object illuminated by a laser.…”

Section: Orthogonality and Zeroingmentioning

confidence: 99%

“…Once the initial and the final phases are determined, it is possible to calculate the amount of displacement of each point into the analysis area. Figure 3 shows the experimental ESPI set-up [47]. In fact, rosette strain gauges introduce a not negligible cost particularly in the case where a relevant number of measurements are required.…”

Section: Orthogonality and Zeroingmentioning

confidence: 99%

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Experimental Techniques to Investigate Residual Stress in Joints

Montanari¹,

Fava²,

Barbieri³

2018

Residual Stress Analysis on Welded Joints by Means of Numerical Simulation and Experiments

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Residual stress arising from welding processes is matter of great concern in industrial practice since it can affect geometry, mechanical behavior and corrosion resistance of components. In order to evaluate residual stress in welded joints and optimize postwelding heat treatments, a lot of work has been devoted to the improvement of measurement methods with increasing sensitivity and accuracy. The chapter presents and discusses some of the experimental techniques commonly used today to determine residual stress in welds and describes recent results and advancements. Destructive (sectioning, contour, hole-drilling, instrumented indentation) and nondestructive (Barkhausen noise, ultrasonic, X-ray and neutron diffraction) methods are illustrated to highlight the specific characteristics, advantages and drawbacks.

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Section: Orthogonality and Zeroingmentioning

confidence: 99%

Section: Orthogonality and Zeroingmentioning

confidence: 99%

Experimental Techniques to Investigate Residual Stress in Joints

Montanari¹,

Fava²,

Barbieri³

2018

Residual Stress Analysis on Welded Joints by Means of Numerical Simulation and Experiments

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“…As indicated in the previous section, experimental determinations of an unknown state of stress (residual or internal stresses) are usually performed with these curves and XECs S 2 (hkl) and S 1 (hkl) values of the specimen, using Eq. 14, instead of the stress factors [18][19][20][21][22]. Due to the influence of the morphologic texture on the e uw -versussin 2 w diagrams, their interpretation in terms of macroscopic stresses will, therefore, lead to a state of stress more or less far from the real stress in the material.…”

Section: Influence Of Morphologic Texture On Stress Analysis By Diffrmentioning

confidence: 99%

“…Strictly speaking, in the case of elastically macroscopically anisotropic materials, XECs cannot be used; diffraction stress factors must be applied. Because the stress factors are much more difficult to determine than the XECs, experimentally as by modelling, XECs are often used instead of the stress factor [18][19][20][21][22]. Thus, significant deviations between the real stress state and the one determined experimentally by diffraction methods may occur.…”

Section: Introductionmentioning

confidence: 99%

Influence of morphologic texture on stress analysis by X-ray and neutron diffraction in single-phase metallic materials

et al. 2014

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International audienceIn this work, a study on the influence of morphologic texture on the residual stress determination by diffraction in metallic materials with cubic and hexagonal symmetry is proposed. To this end, elastic self-consistent model has been developed to properly take into account the morphologic texture. Extreme crystallites morphologies (sphere, disc and fiber) were studied, and coupled with the crystallographic texture to reflect the combined effect of morphologic and crystallographic texture in elasticity. In the case of morphologic texture, a stronger influence than the crystallographic texture on the estimated residual stresses (several tens of MPa difference) was observed. We propose a methodology through a scale transition model to take into account the influence of these different morphologies in the stress analysis by diffraction methods. The main purpose of this work is to make the best choice for lattice planes (hkl) used for residual or internal stress analysis, in elasticity, depending on the morphologic (and crystallographic) texture of the polycrystal, especially when the usual X-ray Elasticity Constants (XECs) are used instead of the stress factors

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“…Optical methods like projection moiré (PM), electronic speckle pattern interferometry (ESPI) and digital holography interferometry (DHI) appear to be good candidates to perform this task. All of these methods have been widely and successfully used in experimental mechanics to get full field information about in-plane and out-of plane displacements [1][2][3][4][5][6][7][8][9] with high accuracy and resolution. However preliminary comparative studies [10] show that digital holography appears to be too much sensitive to vibration to be implemented in an hand-held device while problems can arise in ESPI connected with the presence of saliva in the endoral environment.…”

Section: Introductionmentioning

confidence: 99%

Design of a fiber optics fringe projector for 3D reconstruction of dental elements

Casavola

Pappalettera

Pappalettere

2014

2014 Third Mediterranean Photonics Conference

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In this paper the design of a miniaturized fringe-projector is presented. The projector is intended to be inserted in a triangulation scheme in order to allow implementation of projection moiré technique. The system is specifically designed to be part of a device for contouring complex shapes like those of dental elements. The proposed fringe projection system is based upon the projection of the pattern obtained as a result of the interference between the two points-like sources constituted by the wavefronts emerging by two fiber tips put next together. Results obtained on calibrated specimens confirms the feasibility of the proposed approach. In fact, shape errors observed for the calibrated specimens are below the level of precision required in tooth reconstruction (100 μm).

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Analysis of the effects of process parameters in residual stress measurements on Titanium plates by HDM/ESPI

Cited by 32 publications

References 12 publications

Experimental Techniques to Investigate Residual Stress in Joints

Experimental Techniques to Investigate Residual Stress in Joints

Influence of morphologic texture on stress analysis by X-ray and neutron diffraction in single-phase metallic materials

Design of a fiber optics fringe projector for 3D reconstruction of dental elements

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