Thin-layer films and coatings

Yakupov, S. N.; Yakupov, N. M.

doi:10.1088/1742-6596/857/1/012056

Cited by 8 publications

(3 citation statements)

References 11 publications

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“…Современные тонкостенные конструкции состоят непосредственно из несущего тонкостенного элемента и защитного покрытия. Для защиты несущих элементов конструкций от коррозии и эрозии, от высоких температур и огня, от вирусов и бактерий, от различных полей и сред, а также для поглоще-THEORY OF THIN SHELLS ния волн заданного диапазона активно разрабатываются различные композиционные покрытия, в том числе функциональные и интеллектуальные [7][8][9][10].…”

Section: возникающие в процессе эксплуатации проблемыunclassified

Diagnostics of thin-walled structures of complex geometry and structure

Yakupov

2021

Struct. Mech. of Eng. Const. and Build

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The main stages of the birth of thin-walled structures, changes in their relative thickness and mass of a unit area are given; ways of creating perfect thin-walled structures are indicated. The problems arising during the operation of thin-walled structures of complex geometry, as well as approaches and methods of their calculation are noted. To ensure trouble-free operation of a thin-walled structure with a thin-layer coating, under load and exposed to physical fields and environments, it is necessary to correctly diagnose the condition of structural elements. The spline variant of the finite element method in two-dimensional (SV FEM-2) and three-dimensional (SV FEM-3) productions is noted, as well as the synthesis of these variants - SV FEM-2 + SV FEM-3. The combination of the idea of parametrization of the entire domain and approximation of the desired variables within the element by Hermitian cubic splines makes it possible to obtain high-precision consistent finite elements. The developed variants of the finite element method make it possible to evaluate the stress-strain state of structures of complex geometry, including the calculation of multilayer, thin-walled structures with coating and local defects, as well as to take into account specific surface properties other than those of the main array. Studies of stress concentration near local depressions are considered. Two-dimensional experimental and theoretical methods are noted for evaluating the stiffness properties and adhesion of thin-walled, thin-layer and composite structural elements of complex structure, which, along with a distributed complex structure, may have distributed defects. The developments were used in solving specific tasks of a number of enterprises.

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Section: возникающие в процессе эксплуатации проблемыunclassified

Diagnostics of thin-walled structures of complex geometry and structure

Yakupov

2021

Struct. Mech. of Eng. Const. and Build

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“…Keywords: protective coating, substrate, coating, system, complex geometry, structure, tensile rigidity, modulus of elasticity, adhesion, delamination, research methods, experimental-theoretical method For citation Yakupov S.N., Gubaidullin R.I. Rigidity, adhesion and delamination of the coating in the "substrate -coating" system. вающиеся, противообрастающие, сверхгидрофобные покрытия [1][2][3][4][5][6][7][8], новые группы биоцидов и инкапсулированные противообрастающие вещества [9], супергидрофобное композиционное покрытие из сополимеров стирола, метилметакрилата и наночастиц диоксида кремния рассмотрено, в частности, в [10]. Модификация покрытий углеродными нанотрубками и нановолокнами позволяет получать наноструктурированные поверхности, способствующие повышению механических свойств [11].…”

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Rigidity, adhesion and delamination of the coating in the “substrate - coating” system

Yakupov

Gubaidullin²

2022

Struct. Mech. of Eng. Const. and Build

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Protective coatings are widely used in all branches of production and life. The necessary qualities of coatings are provided by developing complex thin-layer compositions. The complexity of the structure of the coating also arises during operation as a result of the influence of the environment, physical fields, human factor. Many coatings are initially formed directly on the surfaces of structures with initially complex geometry. At the same time, a number of smart coatings, along with a complex structure, change their physical and mechanical properties when triggered. When choosing a coating, adhesive and technology for its application, questions arise related to determining their necessary geometric and physical parameters, assessing their mechanical properties and service life depending on the environment and physical fields, etc. This requires a reliable research tool. In the review, based on well-known publications and patents for the invention, the following are noted: methods for studying the mechanical properties of decomposable and non-decomposable coatings; methods for determining adhesion - the adhesion strength of the coating to the substrate; methods for studying the delamination of constituent elements and delamination of the coating from the substrate. Attention is focused on effective experimental and theoretical methods for assessing the mechanical properties of the coating and adhesive on flat and non-planar surfaces, as well as on some relevant results.

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“…matrix and the column of nodal forces of the prismatic finite element, standard for FEM[19][20][21][22][23][24][25][26][27][28][29][30].…”

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Application of finite elements of various dimensions in strength calculations of thin-wall constructions of agro-industrial complex

et al. 2020

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The article presents a comparative analysis of the effectiveness of the use of finite elements of various dimensions in the study of the stress-strain state (SSS) of objects of the agro-industrial complex (AIC). To determine the strength parameters of the AIC objects, which can be attributed to the class of thinwalled, it is proposed to use a two-dimensional finite element in the form of a fragment of the middle surface of a triangular shape with nodes at its vertices. To improve the compatibility of a two-dimensional finite element at the boundaries of adjacent elements, it is proposed to use the Lagrange multipliers introduced in additional nodes located in the middle of the sides of the triangular fragment as additional unknowns. It is proposed to use a three-dimensional finite element in the form of a prism with triangular bases to study the SSS of agricultural objects of medium thickness and thick-walled. To improve the compatibility of the prismatic element, Lagrange multipliers in the middle of the sides of the upper and lower bases are also used. On the example of calculating a fragment of a cylindrical pipeline rigidly clamped at the ends loaded with internal pressure, the effectiveness of the developed two-dimensional and three-dimensional finite elements with Lagrange multipliers was proved. The validity of the use of a twodimensional element for researching the SSS of agricultural objects belonging to the class of thin-walled was proved.

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Thin-layer films and coatings

Cited by 8 publications

References 11 publications

Diagnostics of thin-walled structures of complex geometry and structure

Diagnostics of thin-walled structures of complex geometry and structure

Rigidity, adhesion and delamination of the coating in the “substrate - coating” system

Application of finite elements of various dimensions in strength calculations of thin-wall constructions of agro-industrial complex

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