MEMBRANE VISCOPLASTIC FLOW
MEMBRANE VISCOPLASTIC FLOW
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DOI：
10.1016/s0006-3495(76)85659-7
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发表时间：
1976-01-01
影响因子：
3.4
通讯作者：
HOCHMUTH, RM
中科院分区：
文献类型：
--
作者：
EVANS, EA;HOCHMUTH, RM
在本文中，由Prager和Hohenemser制定的粘塑性理论被用于二维膜表面，并应用于分析从附着在玻璃基板上的红细胞中提取的“微系绳”的流动。粘塑性流动涉及两个固有的材料常数：屈服剪切和表面粘度。由微系绳流动实验计算出膜的塑性流动特性粘度为1 × 10(-2) dyn-s/cm，比脂质膜组分的表面粘度大3个数量级。流体的耗散主要是由超过其屈服剪切的结构基质的流动所控制。屈服剪切是膜在开始不可逆变形之前所能承受的最大剪切结果。发现屈服剪切在2-8 X 10(-2) dyn/cm范围内，比裂解红细胞所需的各向同性张力小两到三个数量级。
In this paper, a theory of viscoplasticity formulated by Prager and Hohenemser is developed for a two-dimensional membrane surface and applied to the analysis of the flow of "microtethers" pulled from red blood cells attached to glass substrates. The viscoplastic flow involves two intrinsic material constants: yield shear and surface viscosity. The intrinsic viscosity for plastic flow of membrane is calculated to be 1 X 10(-2) dyn-s/cm from microtether flow experiments, three orders of magnitude greater than surface viscosities of lipid membrane components. The fluid dissipation is dominated by the flow of a structural matrix which has exceeded its yield shear. The yield shear is the maximum shear resultant that the membrane can sustain before it begins to deform irreversibly. The yield shear is found to be in the range 2–8 X 10(-2) dyn/cm, two or three orders of magnitude smaller than the isotropic tension required to lyse red cells.