Gradient scattered light method for non-destructive stress profile determination in chemically strengthened glass

2016 ◽  
Vol 51 (12) ◽  
pp. 5962-5978 ◽  
Author(s):  
Siim Hödemann ◽  
Andreas Valdmann ◽  
Johan Anton ◽  
Takashi Murata
Keyword(s):  
Scattered Light ◽  
Stress Profile ◽  
Strengthened Glass ◽  
Non Destructive

Numerical and Experimental Investigations on the Residual Stresses at the Centre of Flat Glass Disks After Thermal Tempering

2008 ◽  
Vol 39-40 ◽  
pp. 553-558 ◽  
Author(s):  
Frédéric Soulié ◽  
Norbert Siedow ◽  
John Anton ◽  
Dominique Lochegnies
Keyword(s):  
Residual Stresses ◽  
Scattered Light ◽  
Flat Glass ◽  
Experimental Investigations ◽  
Stress Profile ◽  
Air Cooling ◽  
Conductive Heat ◽  
Air Jets ◽  
Complete Procedure ◽  
Disk Centre

Flat glass disks are thermally tempered by air-cooling with two air jets at the centre of their surfaces. Numerical modelling and photoelasticity measurements are proposed to analyze the distribution of the residual stresses through the glass thickness at the centre of the tempered disks. For the modelling, glass properties dependent of the temperature are used for the conductive heat transfer. Radiation is modelled by an improved approximation method. By taking both structural and stress relaxations into account, the transient and residual stresses are computed along the disk thickness. For experimentation, a complete procedure is proposed to access to the stress state in the centre of the disks using a scattered light polariscope. The average distribution of the residual stresses is deduced from stress profile measurements taking four radial orientations at the disk centre into consideration. Comparison between numerical and experimental values is finally discussed for the residual surface and half-thickness stresses at the disk centre.

The photoelastic determination of thermal stress concentrations in grooved cylinders with a radial temperature gradient

1979 ◽  
Vol 14 (3) ◽  
pp. 95-102 ◽  
Author(s):  
F A Khayyat ◽  
P Stanley
Keyword(s):  
Thermal Stress ◽  
Steady State ◽  
Temperature Gradient ◽  
Scattered Light ◽  
Radial Temperature Gradient ◽  
Stress Concentrations ◽  
Radial Temperature ◽  
Hollow Cylinders ◽  
Non Destructive

A non-destructive photoelastic technique, requiring integrated retardation and scattered-light measurements, is used for the determination of thermal stress concentrations in hollow cylinders with (i) an internal and (ii) an external curcumferential groove, subjected to a steady-state radial temperature gradient.

In-Depth Distribution of Stresses Measured by Multireflection Grazing Incidence Diffraction

2013 ◽  
Vol 772 ◽  
pp. 143-147
Author(s):  
Marianna Marciszko ◽  
Andrzej Stanisławczyk ◽  
Andrzej Baczmanski ◽  
Krzysztof Wierzbanowski ◽  
Wilfrid Seiler ◽  
...  
Keyword(s):  
Depth Distribution ◽  
Grazing Incidence ◽  
Inverse Laplace Transform ◽  
Stress Profile ◽  
X Ray Diffraction ◽  
X Ray ◽  
Grazing Incidence Diffraction ◽  
Destructive Analysis ◽  
Sample Range ◽  
Non Destructive

The geometry based on the multireflection grazing incidence X-ray diffraction (called the MGIXD method) can be applied to measure residual stresses. Using this method, it is possible to perform a non-destructive analysis of the heterogeneous stresses for different and well defined volumes below the surface of the sample (range of several mm). As the result the average values of stresses weighted by absorption of X-ray radiation are measured. In this work the stress profile as a function of depth for mechanically polished Ti and Al samples were calculated from MGIXD data using inverse Laplace transform.

An integrated retardation technique for the determination of thermal stresses in rotationally symmetrical bodies

1979 ◽  
Vol 14 (3) ◽  
pp. 89-94 ◽  
Author(s):  
F A Khayyat ◽  
P Stanley
Keyword(s):  
Thermal Stress ◽  
Quantitative Determination ◽  
Thermal Stresses ◽  
Scattered Light ◽  
Transverse Plane ◽  
Stress Concentrations ◽  
Photoelastic Method ◽  
Non Destructive ◽  
Relative Retardation

The theory of a non-destructive photoelastic method for the quantitative determination of thermal stress concentrations in rotationally symmetrical bodies with a transverse plane of symmetry is presented. This is a development of Fox's work, in which integrated relative retardation and scattered-light observations are required.

Shearography for non-destructive testing of specular reflecting objects using scattered light illumination

2019 ◽  
Vol 112 ◽  
pp. 452-457 ◽  
Author(s):  
Peizheng Yan ◽  
Yonghong Wang ◽  
Fangyuan Sun ◽  
Yu Lu ◽  
Lu Liu ◽  
...  
Keyword(s):  
Scattered Light ◽  
Light Illumination ◽  
Non Destructive Testing ◽  
Destructive Testing ◽  
Non Destructive

scholarly journals Non-destructive stress measurement in double ion-exchanged glass using optical guided-waves and scattered light

2017 ◽  
Vol 125 (11) ◽  
pp. 814-820 ◽  
Author(s):  
Seiji INABA ◽  
Satoshi OGAMI ◽  
Shuji ORIHARA ◽  
Yoshio ORIHARA
Keyword(s):  
Guided Waves ◽  
Stress Measurement ◽  
Scattered Light ◽  
Non Destructive

scholarly journals Numerical Simulations of Light Scattering in Soft Anisotropic Fibrous Structures and Validation of a Novel Optical Setup from Fibrous Media Characterization

Electronics ◽  
2021 ◽  
Vol 10 (5) ◽  
pp. 579
Author(s):  
Francesco di Bartolo ◽  
Emanuele Vignali ◽  
Emanuele Gasparotti ◽  
Antonio Malacarne ◽  
Luigi Landini ◽  
...  
Keyword(s):  
Light Scattering ◽  
Numerical Study ◽  
Scattered Light ◽  
Quantitative Information ◽  
Numerical Results ◽  
Fibrous Media ◽  
Optical Setup ◽  
3D Printed ◽  
Non Destructive ◽  
Fibrous Tissues

The insight of biological microstructures is at the basis of understanding the mechanical features and the potential pathologies of tissues, like the blood vessels. Different techniques are available for this purpose, like the Small Angle Light Scattering (SALS) approach. The SALS method has the advantage of being fast and non-destructive, however investigation of its physical principles is still required. Within this work, a numerical study for SALS irradiation of soft biological fibrous tissues was carried out through in-silico simulations based on a Monte Carlo approach to evaluate the effect of the thickness of the specimen. Additionally, the numerical results were validated with an optical setup based on SALS technique for the characterization of fibrous samples with dedicated tests on four 3D-printed specimens with different fibers architectures. The simulations revealed two main regions of interest according to the thickness (thk) of the analyzed media: a Fraunhofer region (thk < 0.6 mm) and a Multiple Scattering region (thk > 1 mm). Semi-quantitative information about the tissue anisotropy was successfully gathered by analyzing the scattered light spot. Moreover, the numerical results revealed a remarkable coherence with the experimental data, both in terms of mean orientation and dispersion of fibers.

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