Forces and deformations of the abdominal wall-A mechanical and geometrical approach to the linea alba
Forces and deformations of the abdominal wall-A mechanical and geometrical approach to the linea alba
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DOI：
10.1016/j.jbiomech.2010.11.021
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发表时间：
2011-02-24
影响因子：
2.4
通讯作者：
Hartung, C.
中科院分区：
文献类型：
--
作者：
Foerstemann, T.;Trzewik, J.;Hartung, C.
人腹壁在白线区域的力-伸长响应是通过拉伸试验确定的，在拉伸试验中，白线表现出非线性弹性，各向异性行为，这在软生物组织中经常观察到。此外，根据MRI数据确定腹壁的几何形状。几何形状可以由曲率的主半径在纵向约470毫米和在横向约200毫米指定。确定的半径与其他研究中发现的值一致。机械应力，变形和腹部压力的负载情况下超过6%的延伸可以使用拉普拉斯公式和我们的本构和几何发现。因此，单轴和双轴拉伸试验的结果可以使用该模型进行比较。计算证实，大约20 kPa的腹压对应的相关双轴力在横向上约为3.4 N/mm，在纵向上约为1.5 N/mm。杨氏模量可以计算关于单轴和双轴载荷。在这些生理负荷下，纵向和横向之间的顺应比约为2:1。在横向应变和纵向应变下，杨氏模量在横向方向约为50 kPa，在纵向方向约为20 kPa，均为6%左右。这些发现与其他检查腹壁性质的研究结果一致。(C) 2010 Elsevier Ltd.版权所有。
Force-elongation responses of the human abdominal wall in the linea alba region were determined by tensile tests in which the linea alba was seen to exhibit a nonlinear elastic, anisotropic behavior as is frequently observed in soft biological tissues. In addition, the geometry of the abdominal wall was determined, based on MRI data. The geometry can be specified by principal radii of curvature in longitudinal of approximately 470 mm and in the transverse direction of about 200 mm. The determined radii agree with values found in other studies. Mechanical stresses, deformations and abdominal pressures for load cases above 6% elongation can be related using Laplace's formula and our constitutive and geometrical findings. Results from uni- and biaxial tensile tests can thus be compared using this model. Calculations confirm that abdominal pressures of approximately 20 kPa correspond to related biaxial forces of about 3.4 N/mm in the transverse and 1.5 N/mm in the longitudinal direction. Young's moduli can be calculated with respect to the uniaxial as well as the biaxial loading. At these physiological loadings, a compliance ratio of about 2:1 between the longitudinal and transversal directions is found. Young's moduli of about 50 kPa occur in transversal direction and of about 20 kPa in longitudinal direction at transverse and longitudinal strains both in the order of 6%. These findings coincide with results from other investigations in which the properties of the abdominal wall have been examined. (C) 2010 Elsevier Ltd. All rights reserved.