文章基本信息

标题：Estimation of Stresses in Arterial Tissue: From Residual Stresses to Material Parameters
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作者：Gonzalo D. Ares ; Pablo J. Blanco ; Santiago A. Urquiza 等
期刊名称：Mecánica Computacional
印刷版ISSN：2591-3522
出版年度：2017
卷号：35
期号：9
页码：425-425
语种：English
出版社：CIMEC-INTEC-CONICET-UNL
摘要：In the past decades a considerable amount of literature has been published addressing the study of the mechanical behavior of arterial walls. In these works, researchers have developed constitutive models and characterized the typical ranges for the values of material parameters of vascular tissues. Moreover, the existence of residual stresses in conﬁgurations free of loads was revealed, and its impact in the general stress state of the tissue was quantiﬁed. Currently, ex-vivo experiments such as inﬂationextension tests and biaxial stress tests are extensively used for the estimation of the constitutive parameters in arterial wall probes. Also, destructive experiments involving radial cutting of specimens and the separation of arterial layers are used to identify layer-speciﬁc residual deformations (and stresses). For the latter scenario, material parameters are assumed to be known. In this context, a technique for the simultaneous characterization of residual deformations and material parameters in the arterial wall is proposed. This approach is based on data tipically obtained from inﬂation-extension tests, assuming that the material conﬁguration and the radial displacement of the vessel is known for different load conditions given by ﬁxed axial stretch and internal pressure values. The characterization problem is tackled through the minimization of a cost functional that measures the mechanical disequilibrium of the known material conﬁguration and the discrepancy between the predicted and observed displacement of the outer vessel boundary. To illustrate the feasibility of the proposed methodology a manufactured-solution example is presented.
其他摘要：In the past decades a considerable amount of literature has been published addressing the study of the mechanical behavior of arterial walls. In these works, researchers have developed constitutive models and characterized the typical ranges for the values of material parameters of vascular tissues. Moreover, the existence of residual stresses in conﬁgurations free of loads was revealed, and its impact in the general stress state of the tissue was quantiﬁed. Currently, ex-vivo experiments such as inﬂationextension tests and biaxial stress tests are extensively used for the estimation of the constitutive parameters in arterial wall probes. Also, destructive experiments involving radial cutting of specimens and the separation of arterial layers are used to identify layer-speciﬁc residual deformations (and stresses). For the latter scenario, material parameters are assumed to be known. In this context, a technique for the simultaneous characterization of residual deformations and material parameters in the arterial wall is proposed. This approach is based on data tipically obtained from inﬂation-extension tests, assuming that the material conﬁguration and the radial displacement of the vessel is known for different load conditions given by ﬁxed axial stretch and internal pressure values. The characterization problem is tackled through the minimization of a cost functional that measures the mechanical disequilibrium of the known material conﬁguration and the discrepancy between the predicted and observed displacement of the outer vessel boundary. To illustrate the feasibility of the proposed methodology a manufactured-solution example is presented.