The geometrically nonlinear Cosserat micropolar shear–stretch energy. Part I: A general parameter reduction formula and energy‐minimizing microrotations in 2D
The geometrically nonlinear Cosserat micropolar shear–stretch energy. Part I: A general parameter reduction formula and energy‐minimizing microrotations in 2D
复制标题
几何非线性 Cosserat 微极性剪切拉伸能第 I 部分:通用参数缩减公式和能量最小化二维微旋转
DOI:
10.1002/zamm.201500194
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发表时间:
2017
期刊:
影响因子:
--
通讯作者:
P. Nefff
中科院分区:
文献类型:
--
作者:
A. Fischle;P. Nefff
In any geometrically nonlinear quadratic Cosserat‐micropolar extended continuum model formulated in the deformation gradient field and the microrotation field , the shear–stretch energy is necessarily of the form where is the Lamé shear modulus and is the Cosserat couple modulus. In the present contribution, we work towards explicit characterizations of the set of optimal Cosserat microrotations as a function of and weights and . For , we prove a parameter reduction lemma which reduces the optimality problem to two limit cases: and . In contrast to Grioli's theorem, we derive non‐classical minimizers for the parameter range in dimension . Currently, optimality results for are out of reach for us, but we contribute explicit representations for which we name and which arise for by fixing the rotation axis a priori. Further, we compute the associated reduced energy levels and study the non‐classical optimal Cosserat rotations for simple planar shear.
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