Konstantin Georgievich Koifman

Konstantin Georgievich Koifman
Bauman Moscow State Technical University · The head educational, research and methodological center for vocational rehabilitation of persons with disabilities

About

23
Publications
1,331
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43
Citations
Introduction
My interests are on geometric description of incompatible local deformations, surface growth, theory of defects, oriented media, accretion.
Skills and Expertise
Education
September 2009 - July 2015

Publications

Publications (23)
Book
This book is intended to provide a systematic treatment of those parts of modern differential geometry that are essential for modeling of incompatible finite deformations in solids. Included are discussions of generalized deformation and stress measures on smooth manifolds, geometrical formalization for structurally inhomogeneous bodies, various de...
Article
Full-text available
In the present paper, the finite deformations of a laminated inhomogeneous spherical shell are studied. A laminated shell can be considered as a limit case for multilayered shells when the thickness of each layer tends to zero while their quantity tends to infinity. Such a limit might be useful in modeling of multilayered structures with large amou...
Article
Full-text available
In the paper the relationship between pure geometrical concepts of the theory of affine connections, physical concepts related with non-linear theory of distributed defects and concepts of non-linear continuum mechanics for bodies with variable material composition is discussed. Distinguishing feature of the bodies with variable material compositio...
Article
The subject of the present paper is a material connection that describes the sources of incompatibility in growing solids. There are several possibilities to introduce such a connection on the body manifold, which provides formal description of a body as a continuous collection of material particles. Two of them are discussed in detail. The first s...
Article
Full-text available
The present paper is intended to show the close interrelationship between non-linear models of solids, produced with additive manufacturing, and models of solids with distributed defects. The common feature of these models is the incompatibility of local deformations. Meanwhile, in contrast with the conventional statement of the problems for solids...
Conference Paper
Full-text available
In present paper the generalized kinematics for oriented media is discussed. The approach suggested is based on the geometrical formalism, developed in the theory of connection on principle bundles. This makes it possible to take into account a range of orientations, associated with an elementary volume of underlying body, while classical Cosserat...
Article
The present paper aims to develop geometrical approach for finite incompatible deformations arising in growing solids. The phenomena of incompatibility is modeled by specific affine connection on material manifold, referred to as material connection. It provides complete description of local incompatible deformations for simple materials. Meanwhile...
Conference Paper
Full-text available
In the present paper the model for growing oriented solid is developed. Such solids have no global stress-free shape in Euclidean physical space due to the distributed defects, "recorded" into the solid during growing process. Nonetheless, in the framework of geometric approach in continuum mechanics the desired stress-free reference shape can be f...
Article
Control and optimization of manufacturing processes play essential role in LbL (layer-by-layer) technologies. Optimal control allows one, in particular, to reduce the residual stresses in produced details. The present paper provides an example of such optimization. The LbL-structure under study is represented as a hyperelastic hollow cylinder with...
Article
Full-text available
In the present paper a differential-geometric approach is developed to modeling of residual stresses in layered (LbL) structures obtained as a result of successive curing of thin layers of material. The objects of modeling are the structures obtained by sequential adsorption of a large number of thin layers. During this assembling, the internal (re...
Article
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Настоящая статья посвящена формализации мер деформаций в неевклидовых пространствах для простого тела. Привлечение положений неевклидовой геометрии позволяет: i) определить глобальную единообразную отсчетную форму для тел со структурной неоднородностью, вызванной послойным созданием тела в ходе аддитивного процесса; ii) определить глобальную актуал...
Presentation
Full-text available
Презентация к докладу на 60-й Научной конференции МФТИ. Секция управления динамическими системами.
Conference Paper
Full-text available
Geometric methods and their applications in the theory of structurally inhomogeneous bodies are discussed. This methods are based on the representation of a body and physical space in terms of differentiable manifolds which are endowed with specific Riemannian metrics and affine connections, non-Euclidian in general. Affine connection on the physic...
Article
Full-text available
In the present paper, modern differential-geometrical methods for modeling the incompatible finite deformations in solids are developed. The incompatibility of deformations may be caused by a variety of physical phenomena, e.g., distributed dislocations and disclinations, point defects, nonuniform thermal fields, shrinkage, growth, etc. Incompatibl...
Conference Paper
Full-text available
Работа посвящена моделированию напряженно--деформированного состояния системы, возникающей в результате процессов послойного нанесения материала на подложку. Такие процессы используются в аддитивных технологиях (например, в стереолитографии и молекулярной эпитаксии). В качестве модели предложена система криволинейных мембран, попарно механически св...

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