Microstructural aspects of the fracture process in human cortical bone
Microstructural aspects of the fracture process in human cortical bone
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DOI：
10.1023/a:1026719531300
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发表时间：
2000-12-01
影响因子：
4.5
通讯作者：
Rimnac, CM
中科院分区：
文献类型：
--
作者：
Akkus, O;Jepsen, KJ;Rimnac, CM
对人股骨皮质骨组织进行了横向和纵向的断裂韧性测试，以研究其损伤模式及其与微观结构的相互作用。在试验过程中用声发射(AE)监测损伤累积的时间历史，并在试验后对其进行空间组织学观察。横向试件的断裂韧性几乎是纵向试件的两倍(分别为3.47MNM(-3/2)和1.71MNM(-3/2))。横向试件的声发射波形能量含量大于纵向试件，说明横向裂纹扩展方向的断裂阻力较大。结果表明，对于横向试件，主裂纹的扩展包括断裂面的超微结构(弥散)损伤和远离断裂面的线性微裂纹的形成，从而使组织变弱。对于纵向试件，主裂纹的扩展以片层界面分离的形式发生。层状分离一般止住在水泥线上。线状微裂纹主要发生在裂纹扩展方向的间质组织中。(C)2000家克鲁沃学术出版社。
Fracture toughness tests were conducted in the transverse and longitudinal directions to the osteonal orientation of human femoral cortical bone tissue to investigate the resulting damage patterns and their interaction with the microstructure. The time history of damage accumulation was monitored with acoustic emission (AE) during testing and was spatially observed histologically following testing. The fracture toughness of the transverse specimens was almost two times greater than the fracture toughness of the longitudinal specimens (3.47 MNm(-3/2) vs. 1.71 MNm(-3/2), respectively). The energy content of the AE waveforms of transverse specimens were greater than those of the longitudinal specimens implying higher fracture resistance in the transverse crack growth direction. The results showed that the propagation of the main crack involved weakening of the tissue by ultrastructural (diffuse) damage at the fracture plane and formation of linear microcracks away from the fracture plane for the transverse specimens. For the longitudinal specimens, the growth of the main crack occurred in the form of separations at lamellar interfaces. The lamellar separations generally arrested at the cement lines. Linear microcracks occurred primarily in the interstitial tissue for both crack growth directions. (C) 2000 Kluwer Academic Publishers.