Finite Element Analysis on Real Contact Area Based on Fractal Characterization

Wang, Jia Chun; Xing, Bo Qiang; Zhao, Teng

doi:10.4028/www.scientific.net/kem.579-580.517

Cited by 3 publications

(4 citation statements)

References 21 publications

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“…Для получения точной реальной площади контакта между шероховатой и гладкой поверхностями предлагается конечно-элементная модель контакта шероховатой-нежесткой-гладкой поверхностей, в которой шероховатая поверхность характеризуется теорией разрушения [1]. По сравнению с традиционным моделированием этот метод позволяет быстро получить данные ближе к реальной ситуации.…”

Section: обзор литературы и постановка проблемunclassified

“…Известно, что в технике нет абсолютно гладких поверхностей. Поэтому необходимо проанализировать и рассчитать реальную площадь контакта для лучшего понимания трения, износа, смазки и теплопроводности [1]. Знание реальной площади контакта играет важную роль и в печатном процессе, так как она влияет на передачу красочного слоя с печатной формы на бумагу.…”

Section: Introductionunclassified

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Determination of the actual deckle contact area and the actual pressure in the printed area

Aliyev,

Khalilov,

Ismailova

2023

MEI

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The article determines the effect of micro-roughening of the surface roughness of the printing plate on the deformation of the deck. To study the effect of printing plate surface roughness on the actual contact area of the deck in the printing area, the interaction of the roughness microroughness with the surface of the softer material of the deck was considered. A review and discussion of the results of studies on contact problems was made. To determine the actual contact area from the applied load, the distribution of micro protrusions of the surface roughness of the printing plate is taken into account. A method has been developed for calculating the actual deckle contact area and the actual pressure in the printing area, taking into account the surface roughness of the printing plate. According to the proposed method, the values of the actual deckle contact area and the actual pressure in the printing zone were calculated. It has been established that with an increase in the normal load, the actual deckle contact area increases. Also, an increase in the normal load leads to an increase in the actual pressure. The set values of the actual contact area and the actual pressure contribute to the formation of an elastic saturated contact of the deckle, which ensures high quality prints. The results obtained by the developed method are compared with calculations based on known dependencies. In calculations, the number of protrusions crossed by the average level and the number of protrusion tops located above the midline in the area corresponding to the base length are determined, respectively, by the average roughness step and by the average step between adjacent roughness protrusions. The research results make it possible to make the right choice of printing plates and decals when adjusting and operating a printing machine, as well as to set the actual pressure value, which ensures high quality prints.

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Section: обзор литературы и постановка проблемunclassified

Section: Introductionunclassified

Determination of the actual deckle contact area and the actual pressure in the printed area

Aliyev,

Khalilov,

Ismailova

2023

MEI

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“…The quality of prints in the offset printing process depends on the provision of the necessary technological pressure, which contributes to the transfer of the ink layer and creates deformation of the elastic deckel in the printing contact zone [1]. Therefore, it is necessary to analyze and calculate the real contact area for a better understanding of the transfer of the ink layer from the printing plate to the deckel and from the deckel to paper [2]. The distortion of the image caused by the deformation of the platen press depends on the load during printing [3][4][5].…”

Section: Introductionmentioning

confidence: 99%

“…The distortion of the image caused by the deformation of the platen press depends on the load during printing [3][4][5]. For this purpose, new methods for estimating the real contact area depending on the normal load are presented [2,[6][7][8][9][10][11]. Mutual contact of parts occurs along the roughness peaks and ledges, on which real contact is made [12,13].…”

Section: Introductionmentioning

confidence: 99%

Development of a scheme for the distribution of contact areas between the plate and offset cylinders

Aliyev,

Ismailova

2023

TAPR

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The object of the research is the distribution of contact areas between the plate and offset cylinders. For printing impression in the offset printing process, it is necessary to ensure the transfer of printing ink from the ink unit to the printing plate, from the mold to the rubber-fabric material (deckel) of the offset cylinder and from the deckel to the printed material. At the same time, the quality of the prints is ensured by creating the necessary technological pressure between the plate, offset and printing cylinders, which also contributes to the deformation of the elastic deckel and the transfer of the ink layer in the contact zone. The transfer of illustrative and textual information from the form to the deckel of the offset cylinder occurs due to the actual touch area. Therefore, the study and calculation of the actual contact area is necessary to study the transfer of the paint layer in the contact zones. For this purpose, a review of some studies on contact problems was carried out, their advantages and disadvantages were discussed. Theoretical and experimental relations are given. It has been established that micro protrusions of the surface roughness of the printing plate significantly affect the deformation of the deckel. To study the influence of the surface roughness distribution of the printing plate on the actual deckel contact area in the contact zone, the interaction of micro protrusions of the surface roughness of the printing plate with the deckel surface, leading to additional displacements, was taken into account. A method for calculating the number of roughness protrusions is proposed to further determine the actual deckel contact area and the actual pressure in the contact zone, taking into account the surface roughness of the printing plate. Based on the parameters calculated by the proposed method with known values of the surface roughness of the printing plate in the future it is possible to determine the actual deckel contact area and the actual contact pressure the optimal values of which are necessary to ensure the required ink transfer and print quality during printing. The data obtained also contribute to the determination of the modes of the printing process when printing the entire circulation, which leads to an increase in the circulation stability of printing forms. Increasing the circulation stability of printing plates allows to save the number of consumed printing plates. In the future, according to the results obtained, it is recommended to compile reference data, which are necessary when setting up and operating the printing machine.

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A comparative study of fractal dimension calculation methods for rough surface profiles

Chen

Liu

Zhou

2018

Chaos, Solitons & Fractals

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Finite Element Analysis on Real Contact Area Based on Fractal Characterization

Cited by 3 publications

References 21 publications

Determination of the actual deckle contact area and the actual pressure in the printed area

Determination of the actual deckle contact area and the actual pressure in the printed area

Development of a scheme for the distribution of contact areas between the plate and offset cylinders

A comparative study of fractal dimension calculation methods for rough surface profiles

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