Zioupos P, Barbenel J C
Bioengineering Unit, University of Strathclyde, Glasgow, UK.
Biomaterials. 1994 Apr;15(5):374-82. doi: 10.1016/0142-9612(94)90250-x.
A constitutive law to describe the mechanical behaviour of native bovine pericardial samples is proposed. The model is based upon an idealization of the tissue structure and in particular makes use of the preferential orientation of the collagen and elastin fibres in the plane of the tissue along a mechanically predominant direction. This non-axisymmetric layout of the tissue fibres has been shown in the past to cause a systematic variation of the tensile strength and the stiffness with the angle of orientation. The proposed constitutive relation provided a very good fit for results collected along two orthogonal principal directions in the past in uniaxial and biaxial tensile testing modes. It also allowed a better understanding of the interaction of the various load bearing elements and was able to describe some strange features of the tissue's anisotropic mechanical behaviour.
提出了一种描述天然牛心包样本力学行为的本构定律。该模型基于组织结构的理想化，尤其利用了组织平面内胶原纤维和弹性纤维沿机械主导方向的优先取向。过去已表明，组织纤维的这种非轴对称布局会导致拉伸强度和刚度随取向角度发生系统性变化。所提出的本构关系与过去在单轴和双轴拉伸试验模式下沿两个正交主方向收集的结果拟合得非常好。它还能更好地理解各种承载元件之间的相互作用，并能够描述该组织各向异性力学行为的一些奇特特征。
