期刊
ACTA BIOMATERIALIA
卷 6, 期 4, 页码 1505-1514出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.actbio.2009.11.026
关键词
Biomaterials; Elk antler; Cortical bone; Fracture toughness; Resistance-curves
资金
- Office of Science, Office of Basic Energy Sciences, Division of Materials Sciences and Engineering, of the US Department of Energy [DE-AC02-05CH11231]
- National Science Foundation [DMR 0510138]
- Army Research Office [W911-08-1-0461]
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. Published by Elsevier Ltd. on behalf of Acta Materialia Inc.
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