Mechanics of linear microcracking in trabecular bone
Mechanics of linear microcracking in trabecular bone
复制标题
骨小梁线性微裂纹的力学
DOI：
10.1016/j.jbiomech.2018.11.018
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发表时间：
2019
影响因子：
2.4
通讯作者：
Siegmund, Thomas
中科院分区：
文献类型：
--
作者：
Hammond, Max A.;Wallace, Joseph M.;Allen, Matthew R.;Siegmund, Thomas
骨小梁中的微裂纹是导致骨小梁组织机械降解和重塑的原因。骨小梁力学的最新研究结果表明，骨组织微结构，组织弹性异质性和组织水平的力学各向异性都应该被考虑，以获得详细的信息，机械应力状态。本研究探讨了组织微结构，组织的弹性和材料分离性能的异质性和组织水平的各向异性对微裂纹形成过程的影响。用扩展有限元法建立了微尺度骨模型。结果表明，骨组织的各向异性和异质性对骨组织的韧性和骨小梁对微裂纹形成的抵抗力有显著贡献。计算了从假定的均匀各向同性组织到假定的各向异性非均匀组织的微裂纹萌生的压缩应变增加四倍。
Microcracking in trabecular bone is responsible both for the mechanical degradation and remodeling of the trabecular bone tissue. Recent results on trabecular bone mechanics have demonstrated that bone tissue microarchitecture, tissue elastic heterogeneity and tissue-level mechanical anisotropy all should be considered to obtain detailed information on the mechanical stress state. The present study investigated the influence of tissue microarchitecture, tissue heterogeneity in elasticity and material separation properties and tissue-level anisotropy on the microcrack formation process. Microscale bone models were executed with the extended finite element method. It was demonstrated that anisotropy and heterogeneity of the bone tissue contribute significantly to bone tissue toughness and the resistance of trabecular bone to microcrack formation. The compressive strain to microcrack initiation was computed to increase by a factor of four from an assumed homogeneous isotropic tissue to an assumed anisotropic heterogenous tissue.