Material strengthening by crack and cavity healing

Sylovanyuk, V. P.; Yukhim, R. Ya.

doi:10.1007/s11223-011-9265-1

Cited by 7 publications

(6 citation statements)

References 4 publications

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“…Effective means of restoring cracked surfaces, especially those caused by metal flooding [68], include the application of repair coatings, patches or bandages in the area of isolated macrocracks [69][70][71], injection of malleable material into the cavity of crack-like defects [72][73][74] and filling of multiple cracks with a non-contrast material [75,76]. It should be noted that for steel brake pulleys of band brakes, it is strictly forbidden to use any repair measures to heal cracks on the working cylindrical friction surface.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of the Degree of Degradation of Brake Pad Friction Surfaces Using Image Processing

Mandziy,

Ivasenko,

Berehulyak

et al. 2024

Lubricants

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The improvement of drilling rig systems to ensure a reduction in unproductive time spent on lowering and lifting operations for replacing drilling tools and restoring the performance of drilling equipment units is an important task. At the same time, considerable attention is paid to the reliable and efficient operation of the braking systems of drilling rig winches. In the process of operation, the polymer pads periodically come into contact with the outer cylindrical surface of the metal pulley during braking, work in extreme conditions and wear out intensively, so they need periodic replacement. Tests were carried out on a modernized stand and in industrial conditions for the brakes of drilling winches. A methodology for evaluating the degradation of the brake pad friction surface during its operation is proposed. The assessment of the degradation degree is carried out based on the image of the brake pad surface using image processing techniques. Geometric transformations of the input image were performed to avoid perspective distortions caused by the concave shape of the brake pads and the spatial angle at which the image is acquired to avoid glares. The crack detection step was implemented based on the scale-space theory, followed by contour detection and skeletonization. The ratios of the area and perimeter of segmented and skeletonized cracks to the total area were chosen as integral characteristics of the degradation degree. With the help of scanning electron microscopy, the character of the destruction of the friction surface and the degradation of the polymer material was investigated. Experimental studies were performed, and the application of the proposed method is illustrated.

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Section: Introductionmentioning

confidence: 99%

Evaluation of the Degree of Degradation of Brake Pad Friction Surfaces Using Image Processing

Mandziy,

Ivasenko,

Berehulyak

et al. 2024

Lubricants

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“…The results of the analysis of the behavior and reinforcing effect of thin coatings and overlays applied to slabs with defects [32][33][34][35] and shells with cracks [36,37] are of important applied value. In this direction, researchers also studied the patterns of development of operational damage in coatings [38,39] and developed technologies for healing cracks by injecting pliable [40][41][42] and non-contrast [43] fillers.…”

Section: Introductionmentioning

confidence: 99%

Analytical Model of Deformation of a Functionally Graded Ceramic Coating under Local Load

Shatskyi,

Makoviichuk,

Ropyak

et al. 2023

Ceramics

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In this article, an analytical approach to the study of the behavior of functionally graded FG coatings under local load is developed. The method is suitable for coatings with a specific structure. We consider that the coating can be conditionally divided into two zones: a relatively rigid outer and a relatively compliant inner. The outer layer is modeled by a non-homogeneous plate that bends. We submit the inner substrate to the hypothesis of a non-homogeneous thin Winkler layer. The solution of the formulated boundary value problem is constructed in analytical form. Simulation examples for FG aluminum oxide coatings grown from aluminum sprayed on steel and from compact alloy D16T are considered. The distributions of equivalent stresses, safety factors and normalized equivalent stresses in the coatings are studied. It is noted that in a heterogeneous material, the location of the minimum of the safety factor does not always coincide with the location of the maximum of the equivalent stress.

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“…Analytical methods of stress analysis in layered coatings under local load [ 27 , 28 , 29 ], studies of the influence of flexible [ 30 , 31 ] and composite [ 32 , 33 , 34 ] coatings on the limited state of cracked plates and shells are worth considering. In addition, the coating of damaged surfaces can be treated as the healing of cracks by injection technologies with pliable aggregates [ 35 , 36 , 37 ] or non-contrast materials [ 38 , 39 ].…”

Section: Introductionmentioning

confidence: 99%

Multiclass Level-Set Segmentation of Rust and Coating Damages in Images of Metal Structures

Bembenek

Mandziy

Ivasenko

et al. 2022

Sensors

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This paper describes the combined detection of coating and rust damages on painted metal structures through the multiclass image segmentation technique. Our prior works were focused solely on the localization of rust damages and rust segmentation under different ambient conditions (different lighting conditions, presence of shadows, low background/object color contrast). This paper method proposes three types of damages: coating crack, coating flaking, and rust damage. Background, paint flaking, and rust damage are objects that can be separated in RGB color-space alone. For their preliminary classification SVM is used. As for paint cracks, color features are insufficient for separating it from other defect types as they overlap with the other three classes in RGB color space. For preliminary paint crack segmentation we use the valley detection approach, which analyses the shape of defects. A multiclass level-set approach with a developed penalty term is used as a framework for the advanced final damage segmentation stage. Model training and accuracy assessment are fulfilled on the created dataset, which contains input images of corresponding defects with respective ground truth data provided by the expert. A quantitative analysis of the accuracy of the proposed approach is provided. The efficiency of the approach is demonstrated on authentic images of coated surfaces.

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Material strengthening by crack and cavity healing

Cited by 7 publications

References 4 publications

Evaluation of the Degree of Degradation of Brake Pad Friction Surfaces Using Image Processing

Evaluation of the Degree of Degradation of Brake Pad Friction Surfaces Using Image Processing

Analytical Model of Deformation of a Functionally Graded Ceramic Coating under Local Load

Multiclass Level-Set Segmentation of Rust and Coating Damages in Images of Metal Structures

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