Stability analysis of the two-phase torsional rigidity near a radial configuration

Stability analysis of the two-phase torsional rigidity near a radial configuration
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径向结构附近两相扭转刚度的稳定性分析

DOI:
10.1080/00036811.2018.1478082
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发表时间:
2018
影响因子:
1.1
通讯作者:
Cavallina Lorenzo
Cavallina Lorenzo
中科院分区:
数学4区
文献类型:
--
作者:
Cavallina Lorenzo

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记以原点为中心的单位球。我们假设它包含一个核心,由一个较小的同心球,由(可能)不同的材料制成。我们发现,根据两种材料的相对硬度,这种径向配置可以是局部最大化的扭转刚度functionalE或鞍形。在本文中,我们考虑同时作用于边界和的扰动。这引起了共振效应,而在孤立扰动时不存在共振效应。一个详细的分析的符号的二阶形状导数的Eis,然后通过采用球谐函数的使用成为可能。
Letdenote the unit ball of() centered at the origin. We suppose thatcontains a core, given by a smaller concentric ball, made of a (possibly) different material. We discover that, depending on the relative hardness of the two materials, this radial configuration can either be a local maximizer for the torsional rigidity functionalEor a saddle shape. In this paper, we consider perturbations that simultaneously act on the boundariesand. This gives rise to resonance effects that are not present whenorare perturbed in isolation. A detailed analysis of the sign of the second order shape derivative ofEis then made possible by employing the use of spherical harmonics.
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