论文标题
来自三维非线性弹性的薄壁缸的屈曲
Buckling of thin-walled cylinders from three dimensional nonlinear elasticity
论文作者
论文摘要
Flügge对压缩的薄壁缸进行的著名分叉分析基于一系列简化的假设,这些假设允许获得分叉景观,以及针对极限行为的明确表达:表面不稳定性,皱纹,皱纹和Euler杆屈曲。 Flügge引入的最严重的假设是使用增量本构方程,该方程并非来自任何非线性超弹性本构定律。这是该理论的适用性的强大限制,当将其用于以不同的本构方程为特征的材料(例如mooney-rivlin材料)时,这将变得有问题。我们重新介绍了整个Flügge的配方,从而获得了任何构型方程式的框架。使用两个不同的非线性超弹性组成方程(称为可压缩材料)导致增量方程,这减少了Flügge在适当简化下衍生的方程。他的结果得到了确认,以及现在严格获得的所有极限方程,并扩展了他的理论。薄壳屈曲理论的这种扩展允许对非线性本构定律的分叉景观进行计算有效的确定,例如,该定律可用于模拟动脉的生物力学或软气动机器人臂。
The famous bifurcation analysis performed by Flügge on compressed thin-walled cylinders is based on a series of simplifying assumptions, which allow to obtain the bifurcation landscape, together with explicit expressions for limit behaviours: surface instability, wrinkling, and Euler rod buckling. The most severe assumption introduced by Flügge is the use of an incremental constitutive equation, which does not follow from any nonlinear hyperelastic constitutive law. This is a strong limitation for the applicability of the theory, which becomes questionable when is utilized for a material characterized by a different constitutive equation, such as for instance a Mooney-Rivlin material. We re-derive the entire Flügge's formulation, thus obtaining a framework where any constitutive equation fits. The use of two different nonlinear hyperelastic constitutive equations, referred to compressible materials, leads to incremental equations, which reduce to those derived by Flügge under suitable simplifications. His results are confirmed, together with all the limit equations, now rigorously obtained, and his theory is extended. This extension of the theory of buckling of thin shells allows for computationally efficient determination of bifurcation landscapes for nonlinear constitutive laws, which may for instance be used to model biomechanics of arteries, or soft pneumatic robot arms.