Three-dimensional finite element analysis of the effects of anisotropy on bone mechanical properties measured by nanoindentation

Z. Fan; J.Y. Rho; J.G. Swadener

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Three-dimensional finite element analysis of the effects of anisotropy on bone mechanical properties measured by nanoindentation

机译：纳米压痕法测量各向异性对骨力学性能影响的三维有限元分析

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A three-dimensional finite element analysis (FEA) model with elastic-plastic anisotropy was built to investigate the effects of anisotropy on nanoindentation measurements for cortical bone. The FEA model has demonstrated a capability to capture the cortical bone material response under the indentation process. By comparison with the contact area obtained from monitoring the contact profile in FEA simulations, the Oliver-Pharr method was found to underpredict or overpredict the contact area due to the effects of anisotropy. The amount of error (less than 10 percent for cortical bone) depended on the indentation orientation. The indentation modulus results obtained from FEA simulations at different surface orientations showed a trend similar to experimental results and were also similar to moduli calculated from a mathematical model. The Oliver-Pharr method has been shown to be useful for providing first-order approximations in the analysis of anisotropic mechanical properties of cortical bone, although the indentation modulus is influenced by anisotropy.

机译：建立了具有弹塑性各向异性的三维有限元分析（FEA）模型，以研究各向异性对皮质骨纳米压痕测量的影响。 FEA模型已展示了在压痕过程中捕获皮质骨材料反应的能力。通过与在FEA模拟中监视接触轮廓而获得的接触面积进行比较，发现Oliver-Pharr方法由于各向异性的影响而低估或高估了接触面积。错误量（皮质骨的错误率小于10％）取决于压痕方向。从有限元分析在不同的表面方向获得的压痕模量结果显示出与实验结果相似的趋势，并且与由数学模型计算出的模量相似。尽管压痕模量受各向异性影响，但已证明Oliver-Pharr方法可用于在分析皮质骨各向异性力学性能时提供一阶近似值。

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《Journal of Materials Research》 |2004年第1期|p.114-123|共10页
作者
Z. Fan; J.Y. Rho; J.G. Swadener;
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作者单位

Department of Biomedical Engineering, University of Memphis, Memphis, Tennessee 38152;

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收录信息美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
原文格式 PDF
正文语种 eng
中图分类工程材料学;
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Three-dimensional finite element analysis of the effects of anisotropy on bone mechanical properties measured by nanoindentation

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