Korn inequalities for shells with zero Gaussian curvature
Korn inequalities for shells with zero Gaussian curvature
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高斯曲率为零的壳的 Korn 不等式
DOI:
10.1016/j.anihpc.2017.04.004
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发表时间:
2018
期刊:
影响因子:
--
通讯作者:
Harutyunyan, Davit
中科院分区:
文献类型:
--
作者:
Grabovsky, Yury;Harutyunyan, Davit
We consider shells with zero Gaussian curvature, namely shells with one principal curvature zero and the other one having a constant sign. Our particular interests are shells that are diffeomorphic to a circular cylindrical shell with zero principal longitudinal curvature and positive circumferential curvature, including, for example, cylindrical and conical shells with arbitrary convex cross sections. We prove that the best constant in the first Korn inequality scales like thickness to the power 3/2 for a wide range of boundary conditions at the thin edges of the shell. Our methodology is to prove, for each of the three mutually orthogonal two-dimensional cross-sections of the shell, a “first-and-a-half Korn inequality”—a hybrid between the classical first and second Korn inequalities. These three two-dimensional inequalities assemble into a three-dimensional one, which, in turn, implies the asymptotically sharp first Korn inequality for the shell. This work is a part of mathematically rigorous analysis of extreme sensitivity of the buckling load of axially compressed cylindrical shells to shape imperfections.
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