Viscoelastic response of the periodontal ligament: An experimental-numerical analysis
Viscoelastic response of the periodontal ligament: An experimental-numerical analysis
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DOI：
10.1080/03008200490885742
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发表时间：
2004-01-01
影响因子：
2.9
通讯作者：
Dorow, C
中科院分区：
文献类型：
--
作者：
Natali, AN;Pavan, PG;Dorow, C
建立了考虑大应变、各向异性和非弹性时变效应的牙周膜粘弹性本构模型。各向异性特征由组织的复合性质确定，尤其是由胶原纤维的分布确定。与时间相关的粘性现象是由于加载过程中的微观结构修改造成的，例如流体量通过固体基质、纤维的内部重排和本构适应。本文提出的粘弹性模型是用通用有限元程序实现的。对成年猪的PDL试件进行了体外实验，得到了应力松弛曲线和循环应力应变曲线。实验结果与数值计算结果的比较显示出良好的一致性，并证实了假定的公式能够正确地解释PDL的粘弹性行为。
A viscoelastic constitutive model for the periodontal ligament (PDL) capable of accounting for large strains, anisotropy, and inelastic time-dependent effects was developed. Anisotropy characteristics are determined by the composite nature of the tissue and, in particular, by the distribution of collagen fibres. Time-dependent viscous phenomena are due to microstructural modifications during loading, such as fluid fluxes moving through the solid matrix and the internal rearrangement of fibers and constitutive adaptation. The viscoelastic model presented here was implemented in a general purpose finite element code. In vitro experimental tests were carried out on the PDL specimens of adult pigs to obtain stress-relaxation and cyclic stress-strain curves. The comparison of experimental and numerical results revealed good correspondence and confirmed the capability of the formulation assumed to properly interpret the viscoelastic behavior of the PDL.