Optical Methods of Engineering Analysis

Cloud, Gary

doi:10.1017/cbo9780511575013

Cited by 278 publications

(206 citation statements)

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“…where δ 0 is the retardation at the reference wavelength λ 0 and the term C λ /C 0 takes into account the birefringence dispersion of the photoelastic material [11,15,16]. In RGB photoelasticity, the isochromatic fringes are acquired in white light by a RGB camera that decomposes the image into three primary colors, red (R), green (G) and blue (B), by means of three wide band filters.…”

Section: Theoretical Analysismentioning

confidence: 99%

“…Specifically, the determination of the retardation has been carried out through the analysis of the colors by means of the tint plate (fullwave plate) [7,8] and also by means of standard strain discs [1,2,9,10]. The mere observation of the colors and the use of a chart of colors [1,11], such as the one used in the technique of birefringent coatings, produce results that often have only a qualitative value. In this paper, the automation of photoelasticity in white light applied to the analysis of membrane residual stresses in glass plates by the use of RGB photoelasticity [12][13][14] is proposed.…”

Section: Introductionmentioning

confidence: 99%

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RGB photoelasticity applied to the analysis of membrane residual stress in glass

Ajovalasit¹,

Petrucci²,

Scafidi³

2011

Meas. Sci. Technol.

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The measurement of residual stresses is of great relevance in the glass industry. The analysis of residual stress in glass is usually made by photoelastic methods because glass is a photoelastic material. This paper considers the determination of membrane residual stresses in glass plates by automatic digital photoelasticity in white light (RGB photoelasticity). The proposed method is applied to the analysis of membrane residual stresses in some tempered glass. The proposed method can effectively replace manual methods based on the use of white light, which are currently provided by some technical standards.

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Section: Theoretical Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

RGB photoelasticity applied to the analysis of membrane residual stress in glass

Ajovalasit¹,

Petrucci²,

Scafidi³

2011

Meas. Sci. Technol.

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“…The temporal phase shifting method was used (Ref 10,15,16). The beam phase of the interferometry set-up (see Fig.…”

Section: Residual Stress Analysismentioning

confidence: 99%

Residual Stress Analysis of Laser-Drilled Thermal Barrier Coatings Involving Various Bond Coats

et al. 2014

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International audienceThe gas turbine combustion chamber of aero-engines requires a thermal barrier coating (TBC) by thermal spraying. Further heat protection is achieved by laser drilling of cooling holes. The residual stresses play an important role in the mechanical behaviour of TBC. It could also affect the TBC response to delamination during laser drilling. In this work, studies of the cracking behaviour after laser drilling and residual stress distribution have been achieved for different bond coats by plasma spray or cold spray. From interface crack length measured pulse-by-pulse after laser percussion drilling at 20° angle, the role of the various bond coats on crack initiation and propagation are investigated. It is shown that the bond coat drastically influences the cracking behaviour. The residual stresses profiles were also determined by the incremental hole-drilling method involving speckle interferometry. An original method was also developed to measure the residual stress profiles around a pre-drilled zone with a laser beam at 90°. The results are discussed to highlight the influence of TBCs interfaces on the resulting residual stresses distribution before laser drilling, and also to investigate the modification around the hole after laser drilling. It is shown that laser drilling could affect the residual stress state

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“…ESPI (Electronic Speckle Pattern Interferometry) was consequently chosen during tensile test experiments. Complete theoretical and experimental description of ESPI can be found in [12,13]. This technique was widely used to study deformation localization in metals.…”

Section: Introductionmentioning

confidence: 99%

Localization phenomenon investigation on Smated stainless samples by speckle interferometry

Petit

Montay

François

2010

EPJ Web of Conferences

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Abstract. In-plane Electronic Speckle Pattern Interferometry (ESPI) has been successfully used during tensile tests on SMA-treated (Surface Mechanical Attrition Treatment) and as received 316L stainless steel in order to measure the strain rate field. The heterogeneity in the strain rate field can be observed from a stage of deformation which doesn't coincide with the classic Considère's criterion (dF=0) for the diffuse neck initiation (or plastic instability). The initiation of this heterogeneity strongly depends on treatments undergone by the material. In this paper, a comparison was performed about the heterogeneity initiation of specimens SMATed during 30 minutes with 2 mm shot, 3 mm shot and a non-treated sample. The formation of the two slip band system until fracture of the tensile specimen was also studied.

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Optical Methods of Engineering Analysis

Cited by 278 publications

References 0 publications

RGB photoelasticity applied to the analysis of membrane residual stress in glass

RGB photoelasticity applied to the analysis of membrane residual stress in glass

Residual Stress Analysis of Laser-Drilled Thermal Barrier Coatings Involving Various Bond Coats

Localization phenomenon investigation on Smated stainless samples by speckle interferometry

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