In situ measurement of lattice strain using synchrotron radiation and a conical slit system
Obstalecki, Mark
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https://hdl.handle.net/2142/26230
Description
Title
In situ measurement of lattice strain using synchrotron radiation and a conical slit system
Author(s)
Obstalecki, Mark
Issue Date
2011-08-25T22:19:39Z
Director of Research (if dissertation) or Advisor (if thesis)
Beaudoin, Armand J.
Department of Study
Mechanical Sci & Engineering
Discipline
Mechanical Engineering
Degree Granting Institution
University of Illinois at Urbana-Champaign
Degree Name
M.S.
Degree Level
Thesis
Keyword(s)
Conical Slit
In situ
Sychrotron
X-ray
Advanced Photon Source (APS)
Triaxiality
Lattice Strain
Error Sources
Al-Li alloy AA2195
Aluminum-lithium
Abstract
An experiment utilizing synchrotron radiation to measure lattice strain components from an aluminum-lithium sample during tensile loading is presented in detail. The conical slit system at Argonne National Laboratory’s Advanced Photon Source is utilized to isolate a single grain with an orientation of interest from the highly textured alloy. A total of 39 reflections contribute to the calculation of the strain tensor for each load step. Trends were realized in all six independent components of stain, and reveal an elevated initial triaxiality which approached the expected value for tensile loading of an isotropic material as the sample was loaded. Potential error sources are discussed in relation to strain measurements and considerations when using the conical slit system are presented.
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