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首页> 外文期刊>Journal of Biomechanics >The effect of holding time on nanoindentation measurements of creep in bone.
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The effect of holding time on nanoindentation measurements of creep in bone.

机译：保持时间对蠕变蠕变纳米狭窄测量的影响。

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摘要

Viscoelasticity may affect both the elastic and fracture characteristics of bone. Nanoindentation can be used to measure the creep behavior of bone by fitting the depth vs. time data at constant load to rheological models. However, the creep data may be influenced by latent effects arising during the loading phase of indentation. As such, the loading protocol, particularly the holding time, may affect the measured creep time constants. To characterize the effect of holding time on the measures, four cortical bone samples were prepared from four bovine femora and subjected to nanoindentation to measure the creep behavior. The creep time constants were found by fitting the indentation depth vs. time curve to three different rheological models: the standard linear solid, Burgers model, and a two-dashpot Kelvin model. All three models provided good fits to the data, which were relatively insensitive to the initial parameter estimates. The calculated creep time constants increased monotonically with increasing holding time for all three models. However, the relative differences between measurements within a single osteon, within a single sample, and between samples were maintained for creep holding times over 16s. Hence, while the creep time constants measured by nanoindentation with hold times up to 30s may not provide accurate property measurements, comparisons between samples are valid if all are assessed at the same holding time. Considering the long-term viscosity of bone tissue, Burgers model provided the best performance in terms of stability and goodness of fit, and is recommended for future studies.
机译：粘弹性可能会影响骨骼的弹性和骨折特征。纳米intentation可用于通过在恒定负荷与流变模型中拟合深度与时间数据来测量骨的蠕变行为。然而，蠕变数据可能受到压痕期间产生的潜在效应的影响。这样，加载协议，特别是保持时间，可以影响测量的蠕变时间常数。为了表征持有时间对措施的影响，从四个牛股骨中制备了四种皮质骨样品，并进行纳米狭窄以测量蠕变行为。通过拟合压痕深度与时间曲线到三种不同流变模型来找到蠕变时间常数：标准线性固体，汉堡模型和双划线kelvin模型。所有三种模型都提供了对数据的良好拟合，对初始参数估计相对不敏感。计算出的蠕变时间常数单调，随着所有三种模型的持量时间增加。然而，在单个样本内，在单个样本内和样品之间进行测量之间的测量之间的相对差异被维持超过16s的蠕变保持时间。因此，虽然通过纳米温度测量的蠕变时间常数以最多30s的保持时间可能无法提供准确的性能测量，但是，如果在相同的保持时间评估全部，样本之间的比较是有效的。考虑到骨组织的长期粘度，Burgers模型在适合的稳定性和良好方面提供了最佳性能，并建议未来的研究。

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