Abstract:
:Bone is an adaptive material that is designed for different functional requirements; indeed, bones have a variety of properties depending on their role in the body. To understand the mechanical response of bone requires the elucidation of its structure-function relationships. Here, we examine the fracture toughness of compact bone of elk antler, which is an extremely fast-growing primary bone designed for a totally different function than human (secondary) bone. We find that antler in the transverse (breaking) orientation is one of the toughest biological materials known. Its resistance to fracture is achieved during crack growth (extrinsically) by a combination of gross crack deflection/twisting and crack bridging via uncracked "ligaments" in the crack wake, both mechanisms activated by microcracking primarily at lamellar boundaries. We present an assessment of the toughening mechanisms acting in antler as compared to human cortical bone, and identify an enhanced role of inelastic deformation in antler which further contributes to its (intrinsic) toughness.
journal_name
Acta Biomaterjournal_title
Acta biomaterialiaauthors
Launey ME,Chen PY,McKittrick J,Ritchie ROdoi
10.1016/j.actbio.2009.11.026subject
Has Abstractpub_date
2010-04-01 00:00:00pages
1505-14issue
4eissn
1742-7061issn
1878-7568pii
S1742-7061(09)00522-4journal_volume
6pub_type
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