page_title: D-DIA
section_title: Strain
hierarchical_section_title: D-DIA / X-ray diffraction abilities / Strain
caption_attribution_description: English: X-ray radiograph used to determine sample strain in-situ.
context_page_description: The D-DIA or deformation-DIA is an apparatus used for high pressure and high temperature deformation experiments. The advantage of this apparatus is the ability to apply pressures up to approximately 15 GPa while independently creating uniaxial strains up to 50%.
context_section_description: In-situ [strain] measurements can be made by collecting and analyzing x-ray radiographs. Typically this is achieved by utilizing a fluorescent yttrium aluminum garnet (YAG) crystal in combination with a charge coupled device (CCD) camera. By placing metal foils (typically platinum or nickel) on the top and bottom of the sample, the total sample length can be easily observed in the x-ray radiographs during the deformation experiment. Using the initial length measurement and subsequent length measurements during deformation, the following relation can be used to calculate strain.
  ε = (L₀ – L)/L₀
  Where strain is equal to the difference of the initial and final length, divided by the initial length.
caption: Example X-ray radiograph of a sample in the D-DIA
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