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Estimation and interpretation of the intra-granular stress and strain evolution in a uniaxially loaded silica sample using scanning x-ray diffraction

Vestin, Philip LU (2022) In TFHF-5000 FHLM01 20221
Solid Mechanics
Department of Construction Sciences
Abstract
The intra-granular stress and strain evolution of 12 quasi-spherical silica grains, subject to uniaxial loading, has been investigated by analysis of scanning x-ray diffraction data collected at the ID11 ESRF synchrotron beamline. By applying the methods described by Henningsson et al. [1], the intra-granular strains were reconstructed and converted into stresses using an anisotropic linear-elastic material model. Integration of the resulting stress field in planes perpendicular to the loading axis reveals force transfer to the cylinder that surrounds the sample, through frictional contacts. The reconstructed stress fields are compared to results from a simple finite-element
model, and an interpretation of the intra-granular principal... (More)
The intra-granular stress and strain evolution of 12 quasi-spherical silica grains, subject to uniaxial loading, has been investigated by analysis of scanning x-ray diffraction data collected at the ID11 ESRF synchrotron beamline. By applying the methods described by Henningsson et al. [1], the intra-granular strains were reconstructed and converted into stresses using an anisotropic linear-elastic material model. Integration of the resulting stress field in planes perpendicular to the loading axis reveals force transfer to the cylinder that surrounds the sample, through frictional contacts. The reconstructed stress fields are compared to results from a simple finite-element
model, and an interpretation of the intra-granular principal stress distribution is suggested. The role of the principal stresses and the strain energy density for predicting grain failure and force transfer is investigated. It is found that there exists regions inside the grains where the strain energy density is increased. It is suggested that these intra-granular regions of locally increased strain energy density are important for the formation of fractures. Furthermore, analysis of the principal stress distribution inside the loaded grains suggest that the largest principal stress aligns perpendicular to fracture surfaces at the onset of yielding. (Less)
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author
Vestin, Philip LU
supervisor
organization
course
FHLM01 20221
year
type
H3 - Professional qualifications (4 Years - )
subject
keywords
s3DXRD, quartz, intra-granular, strain energy, fracture
publication/series
TFHF-5000
report number
TFHF-5252
language
English
id
9094871
date added to LUP
2022-07-01 12:48:03
date last changed
2022-07-26 09:19:36
@misc{9094871,
  abstract     = {{The intra-granular stress and strain evolution of 12 quasi-spherical silica grains, subject to uniaxial loading, has been investigated by analysis of scanning x-ray diffraction data collected at the ID11 ESRF synchrotron beamline. By applying the methods described by Henningsson et al. [1], the intra-granular strains were reconstructed and converted into stresses using an anisotropic linear-elastic material model. Integration of the resulting stress field in planes perpendicular to the loading axis reveals force transfer to the cylinder that surrounds the sample, through frictional contacts. The reconstructed stress fields are compared to results from a simple finite-element
model, and an interpretation of the intra-granular principal stress distribution is suggested. The role of the principal stresses and the strain energy density for predicting grain failure and force transfer is investigated. It is found that there exists regions inside the grains where the strain energy density is increased. It is suggested that these intra-granular regions of locally increased strain energy density are important for the formation of fractures. Furthermore, analysis of the principal stress distribution inside the loaded grains suggest that the largest principal stress aligns perpendicular to fracture surfaces at the onset of yielding.}},
  author       = {{Vestin, Philip}},
  language     = {{eng}},
  note         = {{Student Paper}},
  series       = {{TFHF-5000}},
  title        = {{Estimation and interpretation of the intra-granular stress and strain evolution in a uniaxially loaded silica sample using scanning x-ray diffraction}},
  year         = {{2022}},
}