scholarly journals Non destructive neutron diffraction measurements of cavities, inhomogeneities, and residual strain in bronzes of Ghiberti’s relief from the Gates of Paradise

2011 ◽  
Vol 109 (6) ◽  
pp. 064908 ◽  
Author(s):  
G. Festa ◽  
R. Senesi ◽  
M. Alessandroni ◽  
C. Andreani ◽  
G. Vitali ◽  
...  
Keyword(s):  
Neutron Diffraction ◽  
Residual Strain ◽  
Non Destructive

Neutron Diffraction as a Tool for Non-Destructive Evaluation of Ceramics

1988 ◽  
Vol 142 ◽  
Author(s):  
John H. Root ◽  
James D. Sullivan
Keyword(s):  
Grain Size ◽  
Neutron Diffraction ◽  
Residual Strain ◽  
Mechanical Characteristics ◽  
Condensed Matter ◽  
Ceramic Composites ◽  
Non Destructive Evaluation ◽  
Minority Phase ◽  
Position Dependence ◽  
Non Destructive

AbstractNeutron diffraction is a powerful probe of the properties of condensed matter. In recent years neutron diffraction has been applied to the non-destructive evaluation of mechanical characteristics of engineering components. This paper presents examples of applications to ceramic composites including the measurement of position dependence of residual strain, grain size and minority phase concentration. In addition, an example of volume-averaged crystallographic texture is presented.

Non-destructive compositional and microstructural characterization of Sardinian Bronze Age swords through Neutron Diffraction

2018 ◽  
Vol 144 ◽  
pp. 387-392 ◽  
Author(s):  
Francesco Grazzi ◽  
Antonio Brunetti ◽  
Antonella Scherillo ◽  
Marco E. Minoja ◽  
Gianfranca Salis ◽  
...  
Keyword(s):  
Neutron Diffraction ◽  
Bronze Age ◽  
Microstructural Characterization ◽  
Non Destructive

scholarly journals Non-Destructive Measurement of Residual Strain in Connecting Rods Using Neutrons

2018 ◽  
Author(s):  
Tomohiro Ikeda ◽  
Jeffrey Bunn ◽  
Chris Fancher ◽  
Alan Seid ◽  
Ryuta Motani ◽  
...  
Keyword(s):  
Residual Strain ◽  
Destructive Measurement ◽  
Non Destructive

scholarly journals Non-Destructive and Micro-Invasive Techniques for Characterizing the Ancient Roman Mosaic Fragments

2020 ◽  
Vol 10 (11) ◽  
pp. 3781 ◽  
Author(s):  
Rodica Mariana Ion ◽  
Bulat A. Bakirov ◽  
Sergey E. Kichanov ◽  
Denis P. Kozlenko ◽  
Alexander V. Belushkin ◽  
...  
Keyword(s):  
Neutron Diffraction ◽  
Spatial Arrangement ◽  
Diffraction Field ◽  
Neutron Tomography ◽  
Three Dimension ◽  
Iron Hydroxides ◽  
X Ray ◽  
Polluted Atmosphere ◽  
Invasive Techniques ◽  
Non Destructive

The color characteristics, vibration spectra, phase and mineral composition, internal structural organization of several fragments of the ancient Roman mosaics from the Roman Mosaic Museum, Constanta, Romania were studied by non-destructive (Chromatic analysis, Neutron Diffraction, Neutron Tomography) and micro-invasive techniques (Optical Microscopy, X-ray Diffraction, Field Emission Scanning Electron Microscopy–Energy Dispersive X-ray Spectroscopy, Raman Spectroscopy, Wavelength Dispersion X-ray Fluorescence). These investigations were performed in order to characterize the original Roman mosaic fragments. The major and minor phase components of the studied mosaic fragments were determined, the crystal structure of the main phases was analyzed, and their three-dimension spatial arrangement was reconstructed. The similar composition of the major phases of all mosaic fragments can indicate a generic recipe for making mosaic elements, but minor phases were presumably added for coloring of mosaic pieces. Some degradation areas inside the volume of the mosaic fragments were found by means of neutron diffraction and neutron tomography methods. These degradation areas are probably related to the formation of iron hydroxides during chemical interactions of mosaic fragments with the sea and urban polluted atmosphere.

Synchrotron Radiation and Neutron Diffraction Study of Hydroxyapatite in Bone at the Interface with Implant

2010 ◽  
Vol 638-642 ◽  
pp. 748-753
Author(s):  
Abdelilah Benmarouane ◽  
Helene Citterio-Bigot ◽  
Guillaume Geandier ◽  
T. Hansen ◽  
Pierre Millet ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Synchrotron Radiation ◽  
Neutron Diffraction ◽  
Neutron Diffraction Study ◽  
Good Prediction ◽  
Direct Connection ◽  
Implant Surface ◽  
Non Destructive ◽  
Non Destructive Techniques

The quantitative evaluation of the preferential orientation of crystallites by the synchrotron and neutron diffraction techniques during regeneration at the interface with implant gives a good prediction of the mechanical properties of the bone. During the process of bone healing after implantation, the speed and quality of regeneration is affected by the nature of the implant surface. Titanium alloy (Ti-Al-4V) is currently coating with the hydroxyapatite (HAp), Ca10(PO4)6 (OH)2, in order to obtain a stable and functional direct connection between bone and implant. At the interface implant-bone, the new bone reconstituted after implantation must have the same mechanical properties of bone in order to accept the implant. Therefore, it is necessary to study by means of two non destructive techniques: neutron diffraction and synchrotron radiation, the crystal growth and texture of this new bone crystals reconstituted at the interface.

Three-dimensional welding residual stresses evaluation based on the eigenstrain methodology via X-ray measurements at the surface

2014 ◽  
Vol 03 (04) ◽  
pp. 1450023
Author(s):  
Masaru Ogawa
Keyword(s):  
Neutron Diffraction ◽  
Residual Stresses ◽  
Three Dimensional ◽  
Strain Gauges ◽  
X Ray Diffraction ◽  
Stress Evaluation ◽  
X Ray ◽  
Residual Strains ◽  
Non Destructive ◽  
Evaluation Accuracy

In order to assure structural integrity for operating welded structures, it is necessary to evaluate crack growth rate and crack propagation direction for each observed crack non-destructively. Here, three dimensional (3D) welding residual stresses must be evaluated to predict crack propagation. Today, X-ray diffraction is used and the ultrasonic method has been proposed as non-destructive method to measure residual stresses. However, it is impossible to determine residual stress distributions in the thickness direction. Although residual stresses through a depth of several tens of millimeters can be evaluated non-destructively by neutron diffraction, it cannot be used as an on-site measurement technique. This is because neutron diffraction is only available in special irradiation facilities. Author pays attention to the bead flush method based on the eigenstrain methodology. In this method, 3D welding residual stresses are calculated by an elastic Finite Element Method (FEM) analysis from eigenstrains which are evaluated by an inverse analysis from released strains by strain gauges in the removal of the reinforcement of the weld. Here, the removal of the excess metal can be regarded as non-destructive treatment because toe of weld which may become crack starters can be eliminated. The effectiveness of the method has been proven for welded plates and pipes even with relatively lower bead height. In actual measurements, stress evaluation accuracy becomes poorer because measured values of strain gauges are affected by processing strains on the machined surface. In the previous studies, the author has developed the bead flush method that is free from the influence of the affecting strains by using residual strains on surface by X-ray diffraction. However, stress evaluation accuracy is not good enough because of relatively poor measurement accuracy of X-ray diffraction. In this study, a method to improve the estimation accuracy of residual stresses in this method is formulated, and it is shown numerically that inner welding residual stresses can be estimated accurately from the residual strains measured by X-ray diffraction.

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