The azobenzene derivatives

Ioniţă, Ionica; Rădulescu, Cristiana; Poinescu, Aurora Anca; Anghelina, Florina Violeta; Bunghez, Raluca Ioana; Ion, Rodica‐Mariana

doi:10.1117/12.2069480

Cited by 6 publications

(5 citation statements)

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“…To be suitable in tribological applications, thermoplastic polymeric materials must have good abrasion resistance. This is not easy to achieve because the viscoelastic properties of polymeric materials make the tribological analysis quite complicated [1,[11][12][13][14][15][16]. Knowing the tribological behavior of different pairs of polymer / metal materials requires a lot of experimental research to introduce and use them in different industrial fields.…”

Section: Methodsmentioning

confidence: 99%

Comparative Study on the Friction Characteristics of Two Polymeric Materials Sliding Into Environments Dried or Lubricated With Oil

et al. 2021

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Thermoplastic polymeric materials used in the case of friction couplings with sliding movement such as guides, bearings, linear bearings, must have good tribological properties related to friction and wear. Indication of these characteristics is a convenient means for faster characterization of the tribological behavior of any pair of materials when operating conditions are changed.The paper presents a comparative study of the friction characteristics for two thermoplastic polymeric materials (Relamid B-10-FC and Turcit B Slydway) that slide on a metal surface in dry or oil-lubricated environments.The evolution of the coefficient of friction for a non-compliant and a conforming contact under different operating and lubrication conditions was analyzed. The experimental research was done on a stand of pin on disk tribological tests illustrating graphically the evolution of the coefficient of friction with the load, speed and time for different surface roughness. The values of the normal experimental forces used to act on the pin were: F_n1=0.5N, F_n2=1N, F_n3=5N, F_n4=10N. The rotational speed of the disc can be changed using a variable speed drive. Experimental sliding speeds were: v_1=0.02m/s,v_2=0.04m/s,v_3=0.06m/s și v_4=0.08m/s. The temperature and humidity of the experimental conditions were as well 18°...22° and 60...70%. Each experiment was evaluated for a period of 30 min. The results of this research can be used to design high-performance mechanical systems to improve the various mechanical processes in which friction phenomena occur.

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Section: Methodsmentioning

confidence: 99%

Comparative Study on the Friction Characteristics of Two Polymeric Materials Sliding Into Environments Dried or Lubricated With Oil

et al. 2021

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“…They successfully replace the metallic materials used to make sliding couplings. Progress in understanding the tribological behavior of polymeric materials requires multiple experimental research [6][7][8][9][10][11][12][13], to its introduction and use in the realization of various machine parts. In this paper it is proposed for analysis the polymeric material Turcite [14] in contact with a metallic material (carbon steel).…”

Section: Methodsmentioning

confidence: 99%

Theoretical and Experimental Studies on Sliding at Low Speeds With Intermittencies

et al. 2020

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The guides of the machine tools, brakes, clutches there is the possibility of the intermittent movement of stick-slip. This opens in the case of frictional couples with sliding motion, due to the low sliding speeds. Intermittent slip introduces vibrational phenomena and influences the uniformity of movement and the state of the surface of the couples due to their use. In this respect, the concerns related to the study of this phenomenon represent an interest in the machine building industry. The paper aims to achieve an original theoretical model for calculating the static and kinetic friction coefficients and its experimental verification on a stick-slip stand. The proposed theoretical model establishes the calculation relations of the static and kinetic friction coefficient and the connection between them taking into account the surface processing method. The originality of the approach is that the model is considered friction between the conical penetrator (steel material) and a polymer material. In the literature, the stick-slip phenomenon is approached only in terms of the analysis of flat surfaces. The torques of said materials is frequently used on the parts of sliding machines where this phenomenon is possible. The paper highlights the influence of exploitation factors (load, speed), the processing of surfaces, and the quality of the lubricating liquid on the stick-slip phenomenon, for a friction coupling of polymeric material / metallic material.

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“…During sliding, an elasto-plastic deformation of the asperities occurs due to hysteresis losses. According to this theory, the total frictional force is equal to the force required to shear the adherent junctions and the force required for the elasto-plastic deformation of the asperities [3][4][5][14][15][16][17].…”

Section: Wwwjosaromentioning

confidence: 99%

Assessments on the Friction and Wear Behavior of Some Polymeric Materials Used in Sliding Contacts

PETRE,

STOIAN,

ENESCU

et al. 2023

J. Sci. Arts

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The effects of friction on polymeric materials are quite difficult to explain due to the micro and macroscopic interactions of the friction coupling surfaces, which slide over each other. The friction and wear behavior of surfaces in sliding motion can be considered important design criteria. By adding different concentrations of reinforcing agent to the base material, the tribological performance of surfaces in sliding motion can be obtained. The experimental study was carried out on a pin-on-disc type tribological stand under dry friction conditions. The friction and wear behavior was analyzed for two base materials (PTFE and PA66) and the same glass fiber reinforced materials (PTFE + 25% fiber-glass and PA66+GF30). The tests were carried out at different sliding speeds and loading forces, v1=0.20 m/s, v2=0.50 m/s, v3=0.75 m/s and loading forces, Fn1=1.0 N, Fn2=2.5 N, Fn3=5.0 N over a friction length of 5000 mm. Research has shown that the coefficient of friction decreases with increasing loading force. Tests have shown that a high value of the friction coefficient does not mean a high wear rate, the wear rate values are between 10-12 and 10-15 m2/N. TheL(1) presences of the reinforcing agent in the base material have a significant importance on the friction and wear behavior under the action of operating factors (load, sliding speed).

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The azobenzene derivatives

Cited by 6 publications

References 0 publications

Comparative Study on the Friction Characteristics of Two Polymeric Materials Sliding Into Environments Dried or Lubricated With Oil

Comparative Study on the Friction Characteristics of Two Polymeric Materials Sliding Into Environments Dried or Lubricated With Oil

Theoretical and Experimental Studies on Sliding at Low Speeds With Intermittencies

Assessments on the Friction and Wear Behavior of Some Polymeric Materials Used in Sliding Contacts

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