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首页> 外文期刊>Journal of Biomechanics >Influences of spherical tip radius, contact depth, and contact area on nanoindentation properties of bone.
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Influences of spherical tip radius, contact depth, and contact area on nanoindentation properties of bone.

机译：球形尖端半径，接触深度和接触面积对骨骼纳米压痕特性的影响。

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摘要

Nanoindentation has been widely used as a means to measure the micro-mechanical properties of bone and to predict the macroscopic properties. The role of indent depth and indenter tip geometry in measuring the hierarchical properties of bone tissue was explored experimentally using a range of spherical indenter tips of R=5, 25, 65, and 200 mum. Nanoindentation arrays, not targeted to fall on specific structures or locations, enabled statistical sampling of osteons within PMMA-embedded, bovine, cortical bone on a single sample to a range of maximum displacements (minimum of 100 nm and maximum of 2000 nm). Elastic finite element models were then utilized to isolate the contributions of indenter tip radius, contact area, and position within the lamellar structure in comparison to the experimental results. For a small, R=5 mum indenter tip, indentation modulus consistently increased with contact depth and increased plastic deformation, resulting in an artificial increase in elastic properties. While larger radius tips (R=25, 65, and 200 mum) did not enable evaluation of a high spatial resolution on the surface, they produced data that was representative of the lower load and contact depth measurements with the smaller tip. However the sensitivity to mechanical property variations across the 2-D surface of the material was lost with increase in indenter tip size. Correspondingly, measurement variance was also decreased as the volume contributing to the indent response represented an average of surface roughness, varying mineral content, defects, and underlying tissue type and structure.
机译：纳米压痕已被广泛用作测量骨骼的微机械性能和预测宏观性能的手段。压痕深度和压头尖端几何形状在测量骨组织的分级特性中的作用已通过使用一系列R = 5、25、65和200毫米的球形压头尖端进行了实验研究。纳米压痕阵列不旨在落在特定的结构或位置上，可以对单个样品中PMMA嵌入的牛，皮质骨中的骨质进行统计采样，达到最大位移范围（最小100 nm，最大2000 nm）。与实验结果相比，然后利用弹性有限元模型来分离压头尖端半径，接触面积和层状结构内位置的影响。对于较小的R = 5毫米压头，压痕模量随接触深度和塑性变形的增加而持续增加，从而导致人为地增加了弹性。虽然较大半径的尖端（R = 25、65和200毫米）无法评估表面上的高空间分辨率，但它们产生的数据代表较小尖端的较低负载和接触深度测量。然而，随着压头尖端尺寸的增加，在材料的二维表面上对机械性能变化的敏感性丧失了。相应地，由于方差响应的体积表示表面粗糙度，变化的矿物质含量，缺陷以及下层组织类型和结构的平均值，因此测量方差也减小了。

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