Methods for quasi-linear viscoelastic modeling of soft tissue: application to incremental stress-relaxation experiments.
Methods for quasi-linear viscoelastic modeling of soft tissue: application to incremental stress-relaxation experiments.
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DOI：
10.1115/1.1615247
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发表时间：
2003-10
期刊：
影响因子：
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通讯作者：
J. Sarver;P. S. Robinson;D. Elliott
中科院分区：
文献类型：
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作者：
J. Sarver;P. S. Robinson;D. Elliott
将拟线性粘弹性(QLV)模型应用于增量应力松弛试验，并推导出每一步的应力表达式。该表达式用于在估计QLV参数之前比较两种归一化应力数据的方法。第一种也是常用的归一化方法被证明是依赖于应变的。因此，第二种归一化方法被提出，并被证明是应变无关的，并且对QLV时间常数更敏感。这些分析结果与有代表性的肌腱数据相吻合。因此，这种应力数据的归一化方法被提出用于未来增量应力松弛的研究，或者当比较不同应变下的应力松弛时。
The quasi-linear viscoelastic (QLV) model was applied to incremental stress-relaxation tests and an expression for the stress was derived for each step. This expression was used to compare two methods for normalizing stress data prior to estimating QLV parameters. The first and commonly used normalization method was shown to be strain-dependent. Thus, a second normalization method was proposed and shown to be strain-independent and more sensitive to QLV time constants. These analytical results agreed with representative tendon data. Therefore, this method for normalizing stress data was proposed for future studies of incremental stress-relaxation, or whenever comparing stress-relaxation at different strains.