Institut für Werkstofftechnik, University of Siegen, 57076 Siegen, Germany.
J Mech Behav Biomed Mater. 2011 Oct;4(7):1452-61. doi: 10.1016/j.jmbbm.2011.05.015. Epub 2011 May 13.
Compressive behaviour of bovine cancellous bone and three open-cell metallic foams (AlSi7Mg (30 ppi and 45 ppi); CuSn12Ni2 (30 ppi)) has been studied using mechanical testing, micro-focus computed tomography and finite element modelling. Whilst the morphological parameters of the foams and the bone appear to be similar, the mechanical properties vary significantly between the foams and the bone. Finite element models were built from the CT images of the samples and multi-linear constitutive relations were used for modelling of the bone and the foams. The global responses of the bone and foam samples were reasonably well captured by the FE models, whilst the percentage of yielded elements as a measure of damage evolution during compression seems to be indicative of the micro-mechanical behaviour of the samples. The damage evolution and distribution patterns across the bone and the foams are broadly similar for the strain range studied, suggesting possible substitution of trabecular bones with appropriate foams for biomechanical studies.
采用力学试验、微焦点计算机断层扫描和有限元建模研究了牛松质骨和三种开孔金属泡沫（AlSi7Mg（30ppi 和 45ppi）；CuSn12Ni2（30ppi））的压缩性能。尽管泡沫和骨的形态参数似乎相似，但泡沫和骨之间的力学性能差异很大。有限元模型是根据样品的 CT 图像建立的，多线性本构关系用于模拟骨和泡沫。FE 模型较好地捕捉了骨和泡沫样品的整体响应，而作为压缩过程中损伤演化的衡量标准的屈服元素的百分比似乎表明了样品的微机械行为。在研究的应变范围内，泡沫和骨的损伤演化和分布模式大致相似，这表明在生物力学研究中，用合适的泡沫替代小梁骨是可能的。
