Stress-controlled viscoelastic tensile response of bovine cornea
Stress-controlled viscoelastic tensile response of bovine cornea
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DOI：
10.1016/j.jbiomech.2006.12.001
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发表时间：
2007-01-01
影响因子：
2.4
通讯作者：
Grazier, J. M.
中科院分区：
文献类型：
--
作者：
Boyce, B. L.;Jones, R. E.;Grazier, J. M.
采用绒毛载荷控制的单轴拉伸实验，对牛角膜的粘弹性响应进行了表征。具体来说，采用了两种类型的试验：在加载速率范围内的循环斜坡试验和在保持应力范围内的蠕变试验。每个实验采用多个重复来量化自然变异性和平均趋势。为了在测试前获得唯一的参考状态，并克服非生理负荷的影响，采用了一种预处理方案。一个准线性粘弹性模型结合表征的微结构的角膜与实验结果进行了比较。对于低应力和中等持续时间，该模型比较有利，但总体而言，材料显示出在准线性框架内无法表示的非线性。Elsevier Ltd.出版。
The viscoelastic response of bovine corneas was characterized using in vilro load-controlled uniaxial tension experiments. Specifically, two types of tests were employed: cycled ramp tests over a range of loading rates and creep tests over a range of hold stresses. Multiple replicates of each were used to quantify natural variability as well as mean trends. A preconditioning protocol was used to obtain a unique reference state before testing and to overcome the effects of non-physiological loading. A quasi-linear viscoelastic model incorporating a representation of the microstructure of the cornea was compared to the experimental results. For low stresses and moderate durations this model compares favorably, but overall the material displays non-linearities that cannot be represented within the quasi-linear framework. Published by Elsevier Ltd.