Assessment of friction and wear characteristics of domestic friction composite materials in loaded aircraft brakes

Chichinadze, A. V.; Albagachiev, A. Yu.; Kozhemyakina, V. D.; Kokonin, S. S.; Суворов, А. В.; Кулаков, В. В.

doi:10.3103/s1068366609040060

Cited by 15 publications

(6 citation statements)

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“…Elongation at break is almost the same for all compositions and lies in a range of 0.4-0.5%. The mechanical properties of the composites are comparable with carbon-carbon composites reinforced with short CFs [21]. It should be noted that carbonized NBR with no fillers shows poor mechanical properties (tensile strength is about 2.7 MPa, Young's modulus is about 1.8 GPa, and elongation at break is about 0.4%).…”

Section: Resultsmentioning

confidence: 67%

Mechanical Properties and Chemical Resistance of New Composites for Oil Pump Impellers

et al. 2018

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In this paper, a new class of high-performance composites and a method of their production based on the carbonization of an elastomeric matrix are proposed. The use of elastomeric matrix makes it possible to manufacture products with complex shapes, while the subsequent carbonization can significantly improve their properties by changing the chemical nature of the elastomeric matrix. Such an approach can reduce the products' machining cost, especially for composites reinforced with super hard fillers such as silicon carbide at high filling degrees. Low-temperature carbonization makes it possible to obtain composites with mechanical behavior similar to that of ceramics. In contrast to classical elastomeric materials, the nitrile butadiene rubber (NBR)-based compounds were highly filled (300 parts per hundred rubber-PHR) with different carbon fillers and silicon carbide; then cured and carbonized at low-temperature 360 • C with the carbonization cycle of 12 h. The feasibility of the production method was validated through the manufacturing of products with complex shapes-impellers for electric centrifugal pumps. It was found that the carbonized composites have good chemical resistance and low water absorption. The composites have high Shore D hardnesses (93-96), ultimate tensile strengths (62-85 MPa), Young's moduli (17-24 GPa), and compressive strengths (155-181 MPa).

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Section: Resultsmentioning

confidence: 67%

Mechanical Properties and Chemical Resistance of New Composites for Oil Pump Impellers

et al. 2018

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“…The test objects were samples of a carbon-carbon composite based on discrete fibers of the Termar_ADF brand [13]. The samples are ring-shaped with outer and inner diameters of 75 and 53 mm, thickness 10 mm.…”

Section: Methodsmentioning

confidence: 99%

The influence of thermocyclic effects on the tribological properties of a carbon-carbon composite under braking conditions

Alisin

2024

E3S Web Conf.

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The article considers the issues of the influence of repeated thermal shock on the frictional properties of a carbon-carbon composite material. For thermal loading, the heat-pulse method was applied, in which the energy of rotating masses is absorbed by a friction couple from samples of the material being studied. The change in the friction coefficient during braking is analyzed. Based on the results of repeated braking, conclusions are drawn about the resistance of the material to thermal cyclic behaviours. Particular attention is paid to the maximum temperature that occurs on friction surfaces and the temperature change during thermal loading. The dependence of the average friction coefficient in each test on the number of loading cycles was obtained. Based on the study, the number of thermal loads at which the frictional properties of the material are stable was established.

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“…Several types of carbon frictional composite materials (CFCM) used in aircraft multidisc brakes have been investigated in the framework of the HDFW system of equations by Chichinadze et al 19 The purpose of the study was to identify friction couples with the optimum wear rate and consistent coefficient of friction based on the performed computations and experimental studies. A number of dependencies of the coefficients of friction and wear on temperature were obtained taking into account the negative effect of water and detergents.…”

Section: Coupled Problemsmentioning

confidence: 99%

Maximum temperature of the disc during repeated braking applications

Grześ

2019

Advances in Mechanical Engineering

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A computational finite element model of a brake disc for determining transient axisymmetric (two-dimensional) temperature field during repeated brake application has been proposed. The presented research is a subsequent stage of a previous study on the coupling of velocity and maximum temperature for a single braking in accordance with the system of equations of heat dynamics of friction and wear. In the analysed case, changes in the mean, flash, maximum and bulk temperature of the disc were determined and discussed. The calculations were carried out at the temperaturedependent coefficient of friction, the thermophysical properties of cast-iron disc combined with cermet brake pads and the time-varying contact pressure. The obtained results were compared with the reference values from the braking simulation at constant operating parameters and independent of temperature properties of materials. It was shown that the maximum values of the mean temperature for both cases differed slightly during the entire process. The flash temperature determined from the heat dynamics of friction and wear system of equations was the highest at the beginning and gradually decreased with the number of brake applications.

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Assessment of friction and wear characteristics of domestic friction composite materials in loaded aircraft brakes

Cited by 15 publications

References 1 publication

Mechanical Properties and Chemical Resistance of New Composites for Oil Pump Impellers

Mechanical Properties and Chemical Resistance of New Composites for Oil Pump Impellers

The influence of thermocyclic effects on the tribological properties of a carbon-carbon composite under braking conditions

Maximum temperature of the disc during repeated braking applications

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