Neutron Diffraction Techniques in Granular Mechanics

Chris M. Wensrich; Erich H. Kisi; Vladimir Luzin; Oliver Kirstein; Alexander L. Smith; Jian Feng Zhang

doi:10.4028/www.scientific.net/MSF.905.190

Paper Titles

Experimental Comparison of In-Depth Residual Stresses Measured with Neutron and X-Ray Diffraction with a Numerical Stress Relaxation Correction Method
p.131

In Situ Stress Measurements during Welding Process
p.137

Minimizing and Characterizing Uncertainties in Neutron Strain Measurements with Special Attention to Grain Size Effects
p.143

New Developments of the Materials Science Diffractometer STRESS-SPEC
p.151

Scanning Three-Dimensional X-Ray Diffraction Microscopy with a High-Energy Microbeam at SPring-8
p.157

Neutron Through-Thickness Stress Measurements in Coatings with High Spatial Resolution
p.165

Residual Stress Depth Distributions for Atmospheric Plasma Sprayed MnCo_1.9Fe_0.1O₄ Spinel Layers on Crofer Steel Substrate
p.174

The X-Ray Micro-Tomography Backed by Molecular Dynamics Simulations in the Analysis of Shock-Induced Damage in Ductile Materials
p.182

Neutron Diffraction Techniques in Granular Mechanics
p.190

HomeMaterials Science ForumMaterials Science Forum Vol. 905Neutron Diffraction Techniques in Granular...

Neutron Diffraction Techniques in Granular Mechanics

Abstract:

Granular materials demonstrate unique mechanical properties stemming from their discrete nature. At large length scales granular assemblies are often viewed from the perspective of continuum theory where they show complex behaviour such as elastic and plastic anisotropy related to the load and deformation history. This complex behaviour is inextricably linked to the micromechanics of load sharing and force transmission at the particle level. At these scales, bulk stress is not shared homogeneously between particles, but rather by a network of `force chains' that form a skeleton supporting the vast majority of the applied load. The formation and failure of these structures govern much of the bulk behaviour of these materials. Neutron diffraction techniques are now providing a window into the mechanics of granular materials at both bulk and particle scales. Through a combination of tomographic neutron imaging and diffraction based strain measurement it is now possible to directly examine the stress within individual particles in granular assemblies. Results of these experiments in two and three dimensions are presented and the outlook for this approach to studying the mechanics of granular materials is discussed.

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Periodical:

Materials Science Forum (Volume 905)

Pages:

190-195

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https://doi.org/10.4028/www.scientific.net/MSF.905.190

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Online since:

August 2017

Authors:

Chris M. Wensrich*, Erich H. Kisi, Vladimir Luzin, Oliver Kirstein, Alexander L. Smith, Jian Feng Zhang

Keywords:

Force Chains, Granular Mechanics, Neutron Diffraction

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