Mr. Ji Hoon Jeon Profile

Ji Hoon Jeon

at Purdue Univ

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Proceedings Article | 19 February 2009 Paper

Raman analysis of yield in cortical bone

Ji Hoon Jeon, Vinay Korlepara, John Blendell, Ozan Akkus

Proceedings Volume 7166, 716606 (2009) https://doi.org/10.1117/12.810020

KEYWORDS: Raman spectroscopy, Bone, Digital image correlation, Minerals, Statistical analysis, Tissues, Collagen, Biological research, Anisotropy, Tissue optics

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There is a relatively deep understanding of macro and meso scale failure processes taking place in bone. Bone has multiple orders of structural hierarchy and damage has to evolve through molecular, supramolecular and micron scales before giving forth to fractures. Raman spectroscopy is known to be an efficient technique to provide information on the failure processes at these scales. We used Raman microspectroscopy to assess the deformation of bone at the supramolecular level and Digital Image Correlation (DIC) was applied to relate local strains to observed shifts in the wavenumber of phosphate symmetric stretch band. DIC analysis of notched samples loaded in tension showed the presence of compressive as well as tensile residual strains. Tensile strain however, was more predominant near the notch. Raman analysis corroborated DIC observations such that the majority of the samples displayed negative shifts in mineral band indicating tensile deformations. The results support Raman based observation of deformations in bone and indicate that heterogeneity and anisotropy of bone complicate the expected stress patterns.

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