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In situ loading and x-ray diffraction quantification of strains in hydroxyapatite particles within a 3D printed scaffold

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  • S. R. Stock, Northwestern University
  • ,
  • J. S. Park, Argonne National Laboratory
  • ,
  • A. Jakus, Northwestern University
  • ,
  • M. Birkbak
  • ,
  • S. Frølich
  • ,
  • H. Birkedal
  • R. Shah, Northwestern University
  • ,
  • J. D. Almer, Northwestern University

A 3D printed scaffold consisting of a composite with very high volume fraction of particulate hydroxyapatite (hAp, 74 vol.%) and small volume fraction of poly-lactic-co-glycolic acid (26 vol.%) was loaded in compression, and the internal strains in the hAp phase were measured by high-energy x-ray diffraction. Diffraction patterns were recorded at multiple positions in the scaffold at cross-head displacements of 0, -0.52 and -0.62 mm (2.0 mm total scaffold height). The 00.2 and 21.0 hAp strains never exceeded 2 × 10−4, and most positions showed strains ≤ 1 × 10−4, which was the magnitude of the experimental uncertainty.

Original languageEnglish
Article number101174
Publication statusPublished - Aug 2021

Bibliographical note

Publisher Copyright:
© 2021

    Research areas

  • Hydroxyapatite (hAp), Internal stresses, Synchrotron radiation, Tissue engineering, X-ray diffraction

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