Shear properties of human brain tissue
Shear properties of human brain tissue
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DOI：
10.1115/1.2798289
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发表时间：
1997-11-01
影响因子：
1.7
通讯作者：
Medige, J
中科院分区：
文献类型：
--
作者：
Donnelly, BR;Medige, J
本研究的目的是通过进行瞬时、单脉冲、高速率的剪切位移测试来确定人脑组织的剪切应力和应变之间的关系。设计并制作了一种等速平行板剪切试验装置。该设备在安装在剪切板之间的圆柱形组织样本中产生恒定速率剪切应变。在事件过程中，用灵敏的石英压电力传感器测量了样品上端的横向反作用力，从而获得了与位移随时间变化有关的力。对12例新鲜脑组织标本的125个组织标本进行了剪切试验。计算了平均真剪应力和有限应变。采用非线性、粘弹性、标准固体模型对恒速试验数据进行了拟合，确定了材料常数。
The objective of this study was to determine a relationship between shear stress and strain for human brain tissue by performing transient, single-pulse, high-rate, shear displacement tests. A constant velocity, parallel plate shear test device was designed and fabricated. This equipment generated constant rate shear strains in cylindrical tissue samples mounted between the shear plates. The transverse reaction force at the upper end of the sample was measured during the event with a sensitive quartz piezoelectric force transducer, thus obtaining the force associated with the displacement versus time ramp. Shear tests were performed on 125 tissue-samples taken from twelve fresh cadaver brain specimens. The average true shear stress and finite strain were calculated. A nonlinear, viscoelastic, standard solid model was fit to the constant rate test data and the material constants were determined.