Author

Hauk, Viktor

doi:10.1016/b978-044482476-9/50000-1

Cited by 124 publications

(199 citation statements)

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“…Peaks representing the lattice planes are observed depending on the distribution, crystallinity and alignment of the crystals. A number of mathematical functions can be used to fit the experimental diffracted intensity profile near the peaks, such as Gaussian, Lorentzian, Voigt, Pseudo-Voigt, Pearson, Rietveld refinement, etc [41,42,53,54]. These functions work well for the perfect and pure crystalline structures, where the diffraction peaks are sharp and distinct.…”

Section: X-ray Diffractionmentioning

confidence: 99%

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X-ray diffraction as a promising tool to characterize bone nanocomposites

Tadano

Giri

2011

Science and Technology of Advanced Materials

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To understand the characteristics of bone at the tissue level, the structure, organization and mechanical properties of the underlying levels down to the nanoscale as well as their mutual interactions need to be investigated. Such information would help understand changes in the bone properties including stiffness, strength and toughness and provide ways to assess the aged and diseased bones and the development of next generation of bio-inspired materials. X-ray diffraction techniques have gained increased interest in recent years as useful non-destructive tools for investigating the nanostructure of bone. This review provides an overview on the recent progress in this field and briefly introduces the related experimental approach. The application of x-ray diffraction to elucidating the structural and mechanical properties of mineral crystals in bone is reviewed in terms of characterization of in situ strain, residual stress-strain and crystal orientation.

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Section: X-ray Diffractionmentioning

confidence: 99%

“…In general, during the measurement of surface strains, plane stress conditions are assumed to exist, and only two principal stresses lying within the plane of the surface are used, neglecting the stress normal to the surface. Hence, from the theory of elasticity, the basic [53,54]:…”

Section: Residual Stress-strain Measurementmentioning

confidence: 99%

X-ray diffraction as a promising tool to characterize bone nanocomposites

Tadano

Giri

2011

Science and Technology of Advanced Materials

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“…2-5 However, these alloys can exhibit rolling and crystallization textures which, generally, make it difficult to use the technique. 6 In such a situation, the possible reflection directions are restricted to small angular ranges near the intensity poles of the texture and the influences of elastic anisotropy and grain interactions on the X-ray strain measurements may have to be taken into account.…”

Section: Doi: 101177/0014485105051007mentioning

confidence: 99%

Residual stress analysis near a cold expanded hole in a textured alclad sheet using X-ray diffraction

Pina

Dias

Matos

et al. 2005

Experimental Mechanics

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ABSTRACT--In this paper we present the methods of determination and the stress obtained at the periphery of a cold expanded hole in a 2024-T3 Alclad aluminum alloy sheet.The measurements in the aluminum clad were performed by the sin2~ method, taking experimental precautions to deal with the texture effects. In the core aluminum a special method had to be implemented to determine the stress values in a direction not accessible to the X-ray diffraction. The strains were measured in sample orientations selected according to the texture characteristics and stress factors Fij were used to calculate the stress tensor. The Fij values were determined assuming a quasi-isotropic material behavior, after concluding that the stress results were not significantly affected by factors calculated for textured material. The residual stress profile, both in the clad and in the sheet, shows a nearly axisymmetric stress state. Compressive stresses were observed near the periphery of the hole, with values that are higher on the exit than on the entrance face. Residual stresses were also higher in the hoop direction than in the radial direction. They decreased with the radial distance to the hole and affected the previous stress state over a distance of 6 ram. The plastic deformation induced by the cold expansion is well evidenced by the FWHM values, which in the affected zone decrease with increasing distance from the hole edge.

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“…If stress gradients are steep enough over the range of depth penetration of X-rays, the sin 2 plots exhibit curvature. Such curvature can be used to estimate the variation of the stress components with depth [3]. However, this method has difficulties with the lack of sensitivity to stress gradients and the fact that several combinations of gradients may cause the same curvature.…”

Section: Introductionmentioning

confidence: 99%

A methodology development for the study of near surface stress gradients

Marques

Dias

Gergaud

et al. 2000

Materials Science and Engineering: A

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A modification of the geometry used in the sin 2 technique of X-ray diffraction is described. A modified equation for residual stress determination, including geometric adapted F ij , is presented. This method allows near surface stress gradients determination and is called pseudo-grazing incidence method. The limits of the new technique were first tested on different powder materials with X-ray radiation produced by conventional tubes and by a synchrotron radiation source. The technique was finally applied for the determination of a residual stress profile in a polished molybdenum surface before and after the deposition of a PVD chromium film.

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Cited by 124 publications

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X-ray diffraction as a promising tool to characterize bone nanocomposites

X-ray diffraction as a promising tool to characterize bone nanocomposites

Residual stress analysis near a cold expanded hole in a textured alclad sheet using X-ray diffraction

A methodology development for the study of near surface stress gradients

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