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Composites: Mechanics, Computations, Applications: An International Journal

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ISSN Druckformat: 2152-2057

ISSN Online: 2152-2073

The Impact Factor measures the average number of citations received in a particular year by papers published in the journal during the two preceding years. 2017 Journal Citation Reports (Clarivate Analytics, 2018) IF: 0.2 To calculate the five year Impact Factor, citations are counted in 2017 to the previous five years and divided by the source items published in the previous five years. 2017 Journal Citation Reports (Clarivate Analytics, 2018) 5-Year IF: 0.3 The Eigenfactor score, developed by Jevin West and Carl Bergstrom at the University of Washington, is a rating of the total importance of a scientific journal. Journals are rated according to the number of incoming citations, with citations from highly ranked journals weighted to make a larger contribution to the eigenfactor than those from poorly ranked journals. Eigenfactor: 0.00004 The Journal Citation Indicator (JCI) is a single measurement of the field-normalized citation impact of journals in the Web of Science Core Collection across disciplines. The key words here are that the metric is normalized and cross-disciplinary. JCI: 0.08 SJR: 0.153 SNIP: 0.178 CiteScore™:: 1 H-Index: 12

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CALCULATION OF THERMAL STRESSES IN A SUBSTRATE−COATING SYSTEM

Volumen 8, Ausgabe 4, 2017, pp. 267-286
DOI: 10.1615/CompMechComputApplIntJ.v8.i4.10
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ABSTRAKT

This publication is devoted to the creation and development of mathematical models and methods for estimating the level and regions of localization of thermal stresses arising in the substrate–coating system. The study of the strain–stress state (SSS) is carried out by successively increasing the mathematical model used in order to increase the degree of conformity between the results obtained and the physics of the process under consideration.
The SSS, free from external forces and fastenings, was analytically investigated for a two-layer substrate–coating system under smooth thermal loading. A simply connected thermoelasticity problem was considered in the formulation of a plane-stress state. The SSS estimate was carried out in the zero-moment approximation (without including the bending) under the assumption of a constant temperature over the wall thickness. The temperature dependences of thermal stresses in the wall layers were constructed. It was revealed that the current level of stress in the layers depends, first of all, on the difference between the true coefficients of the temperature linear expansion of the substrate and coating materials, as well as on the values of their elasticity moduli, Poisson's coefficients, and thicknesses.
The numerical solution built on the basis of the finite element method (FEM) of the boundary-value problem of classical thermoelasticity, corresponding to the model underlying the analytical solution, led to identical results. The shortcomings and limitations introduced into the solution by the considered assumptions have been revealed.
A refined solution of the problem of determining the SSS in the substrate–coating system was proposed for thermal loading on the basis of the FEM, taking into account the arising flexural deformations. The solution was obtained for a semi-infinite plate in the formulation for generalized plane deformation. of the account for bending led to a significant change in the level and nature of the distribution of thermal stresses along the wall thickness. It is shown that calculating SSS without explicitly taking into account the geometric shape of the substrate, even in the simplest case of a semi-infinite plate, leads to unacceptable errors. The basic requirements for finite-element models applied to the study of SSS in the substrate–coating system have been developed.
The SSS correction was carried out in the substrate–coating system on the basis of FEM by including the possibility of formation of irreversible plastic deformations in the coating layer at various temperatures. The associated flow law with the Mises yield criterion was used for the description of the elastic-plastic behavior of the coating material. It was shown that the appearance of inelastic deformations in the coating significantly affects the level of thermal stresses in the entire system.
The evaluation of the level and nature of the stress distribution makes it possible to scientifically approach the development of the coating architecture (the choice of the chemical and phase composition of the layers, their number and thickness), and to significantly reduce the number of experimental studies and tests, as well as the time and costs for their implementation.

REFERENZIERT VON
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  2. Shmorgun Victor Georgievich, Bogdanov Artem I., Taube Alexander O., Analysis of Thermal Stresses in Layered Composite AD1 + Cr20Ni80 + M1 after Heat Treatment, Materials Science Forum, 946, 2019. Crossref

  3. Zou Lu, Descamps Pierre, Method to Predict Performances of PCB Silicone Conformal Coating under Thermal Aging, Applied Sciences, 12, 21, 2022. Crossref

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