Viscoelastic properties of pig kidney in shear, experimental results and modelling
Viscoelastic properties of pig kidney in shear, experimental results and modelling
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DOI：
10.1007/s003970200017
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发表时间：
2002-01-01
期刊：
影响因子：
2.3
通讯作者：
Phan-Thien, N
中科院分区：
文献类型：
--
作者：
Nasseri, S;Bilston, LE;Phan-Thien, N
本文报道了一系列新鲜猪肾流变学测试的结果。使用标准应变控制流变仪，振荡应变扫描实验显示出 0.2% 应变量级的线性粘弹性应变极限。为了确定动态模量的频率分量，使用应力控制流变仪在 0.2% 应变下进行剪切振荡测试。剪切应力松弛测试以 0.2% 的固定应变和 0.02 秒的上升时间进行。我们开发的模型使用具有可变粘度和时间常数的多模上对流麦克斯韦 (UCM) 模型，我们在其中添加了门尼超弹性响应，两者均乘以阻尼函数。已经测试了控制应变应力曲线非线性的不同形式的阻尼函数。该模型适合我们的实验数据，并将整个测试数据与一组参数相当匹配。
In this paper, the results from a series of rheological tests of fresh pig kidney have been reported. Using a standard strain-controlled rheometer, the oscillation strain sweep experiment showed a linear viscoelastic strain limit of the order of 0.2% strain. To determine the components of dynamic moduli in terms of frequency, shear oscillation tests were done at strain 0.2% using a stress-controlled rheometer. Shear stress relaxation tests were carried out with a fixed strain of 0.2% and 0.02 s rise time. The model we have developed uses a multi-mode upper convected Maxwell (UCM) model with variable viscosities and time constants, to which we have added a Mooney hyper-elastic response, both multiplied by a damping function. Different forms of damping functions that control the non-linearity of strain-stress profile have been tested. The model was fitted to our experimental data, and matched the entire test data reasonably well with a single set of parameters.