Abstract
This article presents the results of a numerical study of the stress concentration around two equal and unequal holes in an orthotropic spherical shell made of composite materials under the action of internal pressure. The influence of geometric (hole radii, shell thickness, distance between holes) characteristics, as well as material orthotropy and shear stiffness, on the stress state of spherical shells made of composite materials is studied. A numerical algorithm based on the finite element method has been developed and a software package has been implemented on a computer that allows solving the problem of stress concentration near two unequal holes in spherical shells made of composite materials.
Highlights
A fairly large number of works are devoted to the methods of calculating shell structures made of composite materials and the study of stress concentration near holes
The distribution of stresses around two equal circular holes in an orthotropic spherical shell made of a composite material was investigated taking into account shear stiffness [5, 6]
We studied the stress distribution around two unequal circular holes in an orthotropic spherical shell made of a composite material
Summary
A fairly large number of works are devoted to the methods of calculating shell structures made of composite materials and the study of stress concentration near holes. Within the framework of the improved theory of the Timoshenko type, the application of the finite element method is proposed for solving problems of orthotropic shells made of composite materials, weakened by several holes [3, 4]. The distribution of stresses around two equal circular holes in an orthotropic spherical shell made of a composite material was investigated taking into account shear stiffness [5, 6]. As follows from the above review of works, at present, the study of the stress-strain state of shells made of composite materials with two unequal holes is insufficient
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