基于拉伸压破试验的人体升主动脉内膜力学特性

发布时间：2018-05-08 12:19

本文选题：升主动脉 + 压破试验　；参考：《北京工业大学学报》2017年07期

【摘要】：为获取人体升主动脉内膜力学性质,利用单轴拉伸系统,设计升主动脉内膜压破及拉伸试验方案,获取人体升主动脉内膜力学性质.研究结果表明:人体升主动脉内膜最大压破力与厚度正相关;内膜的周向与纵向的应力-应变均呈非线性曲线关系,并存在各向异性,升主动脉内膜的纵向最大拉伸断裂应力大于周向,初始弹性模量分别为1 104、787 k Pa.因此,在对主动脉内膜破裂风险评估及建立主动脉壁本构方程时应考虑厚度;在夹层、动脉瘤扩张初期,原发破口易沿纵向继续撕裂.
[Abstract]:In order to obtain the mechanical properties of human ascending aorta intima, the uniaxial tension system was used to design the test scheme of ascending aortic intima pressure breaking and stretching, and the mechanical properties of human ascending aorta intima were obtained. The results show that the maximum pressure breaking force of human ascending aorta is positively correlated with the thickness of the intima, and the circumferential and longitudinal stress-strain curves of the intima are both nonlinear and anisotropic. The maximum longitudinal tensile fracture stress of ascending aortic intima is larger than that of circumferential direction, and the initial elastic modulus is 1 104787 KPA, respectively. Therefore, the thickness should be taken into account in assessing the risk of aortic intima rupture and establishing the aortic wall constitutive equation, and in the early stage of dissection and aneurysm dilatation, the primary rupture is prone to continue to tear along the longitudinal direction.
【作者单位】：北京工业大学生命科学与生物工程学院;有研医疗器械(北京)有限公司;
【基金】：国家自然科学基金资助项目(11572014) 北京工业大学“智能制造领域大科研推进计划”资助项目
【分类号】：R318.01;R54

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