Material properties of the axillary pouch of the glenohumeral capsule: is isotropic material symmetry appropriate?
Material properties of the axillary pouch of the glenohumeral capsule: is isotropic material symmetry appropriate?
复制标题
盂肱关节囊腋囊的材料特性：各向同性材料对称性是否合适？
DOI：
10.1115/1.3005169
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发表时间：
2009
期刊：
影响因子：
--
通讯作者：
Debski,RichardE
中科院分区：
文献类型：
--
作者：
Rainis,EricJ;Maas,SteveA;Henninger,HeathB;McMahon,PatrickJ;Weiss,JeffreyA;Debski,RichardE
关于肱骨盂囊的胶原纤维结构和材料特性的不确定性发现使得人们不清楚肱骨盂囊的材料对称性是各向同性还是各向异性。这项工作的总体目标是使用结合实验和计算的方案来表征肩胛囊腋窝袋的力学特性，并确定适当的材料对称性。两个垂直拉伸和有限简单剪切变形应用于一系列组织样本从肩关节囊腋窝袋。通过模拟实验条件，采用有限元逆优化程序确定各向同性超弹性本构模型的材料系数。从两种垂直拉伸变形或有限简单剪切变形中获得的材料系数之间没有显著差异。此外，利用材料系数从一个方向预测的应力-拉伸关系能够预测垂直方向上相同组织样品的响应。组织的纵向和横向材料行为之间的这些相似性意味着胶囊可以被认为是一种各向同性材料。然而，从拉伸和剪切加载条件下得到的材料系数之间确实存在差异。因此，需要一个更先进的本构模型来预测材料的拉伸和剪切响应。
Inconclusive findings regarding the collagen fiber architecture and the material properties of the glenohumeral capsule make it unclear whether the material symmetry of the glenohumeral capsule is isotropic or anisotropic. The overall objective of this work was to use a combined experimental and computational protocol to characterize the mechanical properties of the axillary pouch of the glenohumeral capsule and to determine the appropriate material symmetry. Two perpendicular tensile and finite simple shear deformations were applied to a series of tissue samples from the axillary pouch of the glenohumeral capsule. An inverse finite element optimization routine was then used to determine the material coefficients for an isotropic hyperelastic constitutive model by simulating the experimental conditions. There were no significant differences between the material coefficients obtained from the two perpendicular tensile deformations or finite simple shear deformations. Furthermore, stress-stretch relationships predicted by utilizing the material coefficients from one direction were able to predict the responses of the same tissue sample in the perpendicular direction. These similarities between the longitudinal and transverse material behaviors of the tissue imply that the capsule may be considered an isotropic material. However, differences did exist between the material coefficients obtained from the tensile and shear loading conditions. Therefore, a more advanced constitutive model is needed to predict both the tensile and shear responses of the material.