A New Residual Strain Mapping Program Using Energy Dispersive X-Ray Diffraction at the Advanced Photon Source

Park, Jun-Sang; Chuang, Andrew Chihpin; Okasinski, John; Chen, H.; Shade, Paul A.; Turner, Todd J.; Stock, Stuart R.; Almer, Jonathan

doi:10.1007/s11340-022-00859-1

Cited by 3 publications

(1 citation statement)

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“…modelling is a standard approach with bone [43][44][45]. Recently, a preliminary EDD strain mapping report appeared on in situ loading of an intact carcharhiniform centrum [46], and it appears that this approach will provide valuable insight. One expects comparison of actual three-dimensional strain maps with results of numerical modelling will advance understanding of shark centrum functionality.…”

Section: Endnotesmentioning

confidence: 99%

Bioapatite in shark centra studied by wide-angle and by small-angle X-ray scattering

Park

Almer

James

et al. 2022

J. R. Soc. Interface.

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Members of subclass Elasmobranchii possess cartilage skeletons; the centra of many species are mineralized with a bioapatite, but virtually nothing is known about the mineral's organization. This study employed high-energy, small-angle X-ray scattering (SAXS) and wide-angle X-ray scattering (WAXS, i.e. X-ray diffraction) to investigate the bioapatite crystallography within blocks cut from centra of four species (two carcharhiniform families, one lamniform family and 1-ID of the Advanced Photon Source). All species' crystallographic quantities closely matched and indicated a bioapatite closely related to that in bone. The centra's lattice parameters a and c were somewhat smaller and somewhat larger, respectively, than in bone. Nanocrystallite sizes (WAXS peak widths) in shark centra were larger than typical of bone, and little microstrain was observed. Compared with bone, shark centra exhibited SAXS D -period peaks with larger D magnitudes, and D -period arcs with narrower azimuthal widths. The shark mineral phase, therefore, is closely related to that in bone but does possess real differences which probably affect mechanical property and which are worth further study.

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