Predictions of aneurysm formation in distensible tubes: Part A-Theoretical background to alternative approaches
Predictions of aneurysm formation in distensible tubes: Part A-Theoretical background to alternative approaches
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DOI：
10.1016/j.ijmecsci.2013.02.005
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发表时间：
2013-06-01
影响因子：
7.3
通讯作者：
Hearn, Grant E.
中科院分区：
文献类型：
--
作者：
Bucchi, Andrea;Hearn, Grant E.
有压力的可膨胀管容易出现动脉瘤。当达到相对于该位置的管壁厚度的临界压力时，动脉瘤将发生在沿着管子的某个位置。家长们在努力给派对气球充气时，会意识到关键压力的存在。另一个动脉瘤的例子是胸主动脉瘤，对应于主动脉的永久性扩张，其比例可能危及生命。主动脉瘤的矫正程序包括引入坚硬的材料来预防动脉瘤。类似地，在建议的基于可膨胀管的波能装置中，通过使用不可扩展材料的替代纵向条和适当的橡胶条，部分控制了动脉瘤的形成。在这里，我们考虑由一种材料制成的可膨胀管。回顾了基于动脉瘤的文献后，在非线性有限元分析中使用的材料特性与用于提供实验测量以供比较的样品的材料特性之间存在一些不一致。为了认识到这种不一致，作者决定使用非线性有限元分析和不同的替代公式和解决方案技术来研究动脉瘤的发展。作者没有将应变能函数限制为Neo-Hookean、Mooney-Rivlin和Ogden形式的子集，而是并行实施了几个替代的应变能模型，还首次探索了使用不同的单轴、等双轴和纯剪切实验数据组合对不同橡胶的影响。本文解决了对现实方法的需求(必要的考虑，如Valanis-Landel假设、Maxwell等面积规则和数据选择标准)，以建立可膨胀管的模型，以提供临界压力的预测。与所有其他引用的参考文献一样，使用静态分析。(C)2013爱思唯尔有限公司。保留所有权利。
Pressurised distensible tubes are subject to aneurysms. Aneurysm inception will take place at a location along the tube when a critical pressure, relative to tube wall thickness at that location, is reached. Parents will recognise the existence of critical pressure when endeavouring to inflate a party balloon. Another example of aneurysm is the thoracic aortic aneurysm corresponding to permanent dilation of the aorta in such proportions that it can be life threatening. Corrective procedures for aortic aneurysms involve the introduction of stiff materials to prevent aneurysm. Similarly in a proposed distensible tube based wave energy device aneurysm inception is partially controlled through the use of alternative longitudinal strips of inextensible material and appropriate rubber strips. Here we consider distensible tubes made of one material.Having reviewed the aneurysm based literature some inconsistencies were observed between the material properties used in a non-linear finite element analysis and the material properties of the specimen used to provide experimental measurements for comparison. To appreciate the inconsistencies the authors decided to investigate aneurysm development using both non-linear finite element analyses and distinct alternative formulations and solution techniques. Rather than restrict strain-energy function to a subset of Neo-Hookean, Mooney-Rivlin and Ogden forms, the authors have implemented several alternative strain-energy models in parallel, also exploring for the first time the impact of using different combinations of uniaxial, equi-biaxial and pure shear experimental data for different rubbers.This paper addresses the needs (necessary considerations, such as the Valanis-Landel hypothesis, Maxwell equal area rule and data selection criteria) for a realistic approach to modelling a distensible tube to provide predictions of critical pressure. In common with all other cited references a static analysis is used. (C) 2013 Elsevier Ltd. All rights reserved.