Assessment of Shear Bond Strength of Thermal Spray Coatings by Applying Prismatic Samples

Zaytzev, A. N.; Lukianova, Albina; Demoretsky, D.A.

doi:10.4028/p-297el3

Cited by 7 publications

(5 citation statements)

References 24 publications

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“…Before testing the tensile strength of the coating thickness, the h с and roughness Ra were estimated (Table 2). In the present investigation, the adhesive failure mode occurred at Previous tests [31][32][33] revealed very similar mechanical and physical properties for the MgAl 2 O 4 , Al 2 O 3 oxide coatings, which made it possible to perform FEA only for the Al 2 O 3 coating.…”

Section: Results Of Tensile Bond Strength Of Standard and Elongated S...mentioning

confidence: 52%

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Tensile Adhesion Strength of Atmospheric Plasma Sprayed MgAl2O4, Al2O3 Coatings

et al. 2022

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This study analyses the distribution of stress during the testing of glued cylindrical specimens with thermally sprayed MgAl2O4, Al2O3 oxide coatings in order to evaluate the tensile adhesion strength. The set of studies that make up this work were conducted in order to evaluate the influence of the geometric parameters of cylindrical test specimens, 25 mm in diameter by 16–38.1 mm in height, on the measured tensile adhesion strength of the specimens. The stress and strain states inside the coating and at the coating-substrate interface were determined using the finite element modelling method. The debonding mechanisms, failure mode and influence of the coating microstructure on bond strength are also discussed. The finite element stress analysis shows a significant level of non-uniform stress distribution in the test specimens. The analysis of the results of the modelling stresses and strains using the finite element method for six types of cylindrical specimens, as well as the values obtained for the adhesion testing of MgAl2O4, Al2O3 coatings, show a need to increase the height of the standard cylindrical specimen (according to ASTM C633-13 (2021), GOST 9.304-87). The height should be increased by no less than 1.5–2.0 times to reduce the level of a non-uniform stress distribution in the separation area.

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Section: Results Of Tensile Bond Strength Of Standard and Elongated S...mentioning

confidence: 52%

“…Ceramics 2022, 5, FOR PEER REVIEW 7 Previous tests [31][32][33] revealed very similar mechanical and physical properties for the MgAl2O4, Al2O3 oxide coatings, which made it possible to perform FEA only for the Al2O3 coating.…”

mentioning

confidence: 97%

Tensile Adhesion Strength of Atmospheric Plasma Sprayed MgAl2O4, Al2O3 Coatings

et al. 2022

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“…Thus, knowing the value ofreduced modulus, which the instrument determines from relation (5) during the processing of experimental data, by equation ( 1) we can calculate the modulus of elasticity of the sample or the film on the surface of the sample [1][2][3]. For the calculations, we need to know the Poisson's ratio of the coating which we take to be 0.33.…”

Section: Fig 1 Topography Of the Sample Coating Surfacementioning

confidence: 99%

“…In recent years, the continuous indentation method, formerly known as the kinetic rigidity method, has been increasingly used to determine the rigidity of materials [1][2][3][4][5][6]. The essence of the kinetic rigidity method is that an indenter is introduced into the material under study and two parameters are recorded: the load and the depth of introduction of the indenter.…”

Section: Introductionmentioning

confidence: 99%

Application of the spherical indenter for determination of the elastic modulus of coatings

2023

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In this work a study of nanoindentation of the surface of epoxypolyester-based powder coatings deposited on steel substrates was carried out. The effect of the test method on the identifiable mechanical properties is investigated. The measurement results obtained by using a spherical indenter and a Berkovich indenter are compared. Estimates of reduced modulus of elasticity, Young's modulus and rigidity of coatings are obtained. The experimental data obtained indicate a significant dependence of the determined mechanical properties of the paint and varnish coatings depending on the type of indenter used. In the case of Berkovich indenter, the Young's modulus of coatings (0.6 GPa) is understated in relation to coating properties known from macro experiments (3 GPa). Using a spherical indenter, Young's modulus is overestimated (6.3 GPa).

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“…Polymer protective coatings are widely used in various fields of technology to protect structural elements against corrosion, provide electrical insulation, control the friction characteristics of surfaces, and for decorative purposes, etc. [1][2][3][4][5][6][7][8][9][10][11][12]. The study of the mechanical properties of coatings is an important task in terms of ensuring their strength and wear resistance during operation [13][14][15][16][17][18][19][20][21][22][23][24][25][26][27].…”

Section: Introductionmentioning

confidence: 99%

Effect of protecting coatings on mechanical properties of metal surfaces

2023

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The effects of epoxy-polyester based powder coatings on the mechanical properties of plates made of rolled steel sheets were investigated in this work. The effect of coatings of the order of 100 µm thickness on the mechanical properties of specimens of 0.7-1.5 mm thick was considered. Tests carried out at room and elevated temperatures showed that thin coatings had an insignificant effect on the mechanical properties of the plates in bend and tensile tests. In particular, the tensile and bending stiffness of the plates is virtually unchanged in the presence of coatings, despite the fact that the modulus of elasticity determined in tests of steel plates with coatings is always somewhat lower than the Young's modulus of steel, due to the increased thickness of specimens determined in the presence of coatings. In compression strength tests, on the contrary, the influence of coatings is significant. In the overcritical mode of deformation, the load carrying capacity of coated plates is significantly reduced and their critical load of stability loss becomes 1.2-2.3 times lower (depending on substrate thickness) compared to uncoated samples. This effect can be explained by the influence of residual temperature stresses that arise in the samples after coating.

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Assessment of Shear Bond Strength of Thermal Spray Coatings by Applying Prismatic Samples

Cited by 7 publications

References 24 publications

Tensile Adhesion Strength of Atmospheric Plasma Sprayed MgAl2O4, Al2O3 Coatings

Tensile Adhesion Strength of Atmospheric Plasma Sprayed MgAl2O4, Al2O3 Coatings

Application of the spherical indenter for determination of the elastic modulus of coatings

Effect of protecting coatings on mechanical properties of metal surfaces

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