Mechanistic aspects of the fracture toughness of elk antler bone

被引:129
作者
Launey, M. E. [1 ]
Chen, P-Y. [2 ]
McKittrick, J. [2 ]
Ritchie, R. O. [1 ,3 ]
机构
[1] Univ Calif Berkeley, Lawrence Berkeley Lab, Div Mat Sci, Berkeley, CA 94720 USA
[2] Univ Calif San Diego, Mat Sci & Engn Program, Dept Mech & Aerosp Engn, La Jolla, CA 92093 USA
[3] Univ Calif Berkeley, Dept Mat Sci & Engn, Berkeley, CA 94720 USA
基金
美国国家科学基金会;
关键词
Biomaterials; Elk antler; Cortical bone; Fracture toughness; Resistance-curves; CRACK-GROWTH-RESISTANCE; HUMAN CORTICAL BONE; CEMENT LINE; DEFORMATION; FAILURE; PROPAGATION; BEHAVIOR; COLLAGEN; BRITTLE; TISSUES;
D O I
10.1016/j.actbio.2009.11.026
中图分类号
R318 [生物医学工程];
学科分类号
0831 ;
摘要
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.
引用
收藏
页码:1505 / 1514
页数:10
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