Development of compacted vermicular graphite cast iron for railway brake discs

Lim, Choong-Hwan; Goo, Byeong-Choon

doi:10.1007/s12540-011-0403-x

Cited by 33 publications

(17 citation statements)

References 9 publications

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“…In Figure 9c, the wear surface smoothness of the ceramic brake pad was lower than that of the NAO It can be seen that the wear mechanisms of brake pads and blank brake hub samples were different. During the working process of the semi-metallic brake pads, steel semi-metallic fibers pierced the gray iron, causing significant cutting and peeling damage [24]. As the penetration depth of the metal fiber and the resistance of gray iron increased, the semi-metallic fiber peeled away from the brake pad structure and formed abrasive particles, which continued to cause wear on both sides.…”

Section: Wear Results Of the Brake Pads And Blank Samplesmentioning

confidence: 99%

The Relationship between the Model of the Laser Biomimetic Strengthening of Gray Cast Iron and Matching between Different Brake Pads

Yang

Wang

Zhou

et al. 2020

Metals

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When the surface of gray cast iron is subjected to laser irradiation and melted and then re-solidified, a material can be obtained that has a superior structure and properties to the base metal. On the surface of gray iron brake drums, the surface of the raw material can be processed into a bionic coupling surface with different shapes, structures, and soft and hard tissues similar to the surface of an organism. The wear resistance and fatigue resistance of brake drum surfaces can be greatly improved. However, the relative wear characteristics of the friction pairs in brake systems show that performance improvements in brake systems are the result of appropriately matching the brake drum and brake pad. This paper studies the wear relationship between three kinds of commonly-used brake pads (semi-metallic, organic asbestos-free, and ceramic) and different biomimetic models of brake drum samples. The interaction mechanism and failure mode between three kinds of brake pads and bionic samples were determined. According to the wear test results, the matching relationship between the brake pads and the brake drum was analyzed and determined, which provides a basis for the application of bionic brake drums.

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Section: Wear Results Of the Brake Pads And Blank Samplesmentioning

confidence: 99%

The Relationship between the Model of the Laser Biomimetic Strengthening of Gray Cast Iron and Matching between Different Brake Pads

Yang

Wang

Zhou

et al. 2020

Metals

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“…Considering the symmetry of the disc, one-fourth of the disc was included in the model. The values of the specific heat, density, thermal conductivity and thermal expansion coefficient used in the simulation were given in the function of temperatures in reference [17]. Heat flux of 40 s was given to a stop braking as shown in Figure 3.…”

Section: Heat Transfermentioning

confidence: 99%

A Study on the Contact Pressure and Thermo-Elastic Behavior of a Brake Disc-Pad by Infrared Images and Finite Element Analysis

Goo

2018

Applied Sciences

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Featured Application: Design and performance evaluation of disc/pad; drum/shoe; friction clutches, etc.Abstract: To understand the tribological characteristics of a frictional brake system, it is very important to measure the contact pressure between the brake disc and pads. But until now there have been no direct methods by which to measure the contact pressure. In this study, an attempt to indirectly estimate the contact pressure is proposed. Infrared thermal images and finite element analysis were used as tools. For the thermo-elastic finite element analysis, uniform, linear, quadratic, and quartic heat flux profiles in the radial direction were applied on the disc surface. Thermal and stress fields were obtained under various conditions in the disc fixing holes and on the contact faces of the two half discs. From the numerical results, it was found that the effect of the boundary conditions on the magnitude of thermal stress was about 10%. Numerical temperature data in the radial direction could be curve-fitted to functions with the same order as the heat flux profiles. The coefficients of correlation of the curve-fittings were more than 0.91. It could be concluded that using temperature profiles obtained with an infrared camera, contact pressure distributions on the disc surface could be inferred.2 of 12 discs, the mounting seat and bolts were not included. More realistic 3-dimensional transient heat problems have been conducted using finite element analysis. One of the main merits of finite element analysis is that it can easily reflect non-linear physical or/and mechanical properties in simulation. investigate the influence of temperature dependent properties such as friction coefficient, thermal conduction coefficient, and specific heat on the temperatures and wear of brake discs. Their numerical results showed that fluctuating properties had an effect on the temperature fields and wear in the disc.Computer enhancement has allowed researchers to deal with coupled thermo-mechanical problems. Belhocine and Bouchetara [8] first obtained heat convection coefficients on every surface of the disc by air flow analysis, then performed a thermo-mechanical coupled analysis for full and ventilated brake discs. The maximum temperature on the ventilated disc surface was higher by 60 • C at 100 km/h. Hwang and Wu [9] applied a multi-body technique and a thermo-mechanical coupled model. According to their results, there were fluctuations in temperatures and stresses in the disc. Jian and Shui [10] also performed a thermo-mechanical coupled simulation for a disc/pad unit and compared their numerical and experimental results. They showed that the two results were in good agreement, and temperatures on the disc surface fluctuated during braking. Yan et al.[11] simulated turbulent flow on a ventilated disc with cross-drilled holes using finite element analysis. The cross-drilled holes provided 15-17% higher cooling capacity. Yan et al. [12] showed that X-type cooling vanes were more efficient than conventional radial vanes...

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“…CGI offers higher strength and stiffness than gray cast iron and easier casting and higher thermal conductivity than ductile cast iron [4]. Its unique thermal fatigue resistance makes it very suitable for certain applications such as internal combustion engines and brake components [5,6].…”

Section: Introductionmentioning

confidence: 99%

Abrasive Wear of Compacted Graphite Cast Iron with Added Tin

Lyu

2018

Metallogr. Microstruct. Anal.

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The abrasive wear behavior of traditional compacted graphite cast iron (CGI) and compacted graphite cast iron with 0.1% tin addition (CGI-Sn) is studied using a pin-on-disk tribometer. The microstructures of these two CGIs were observed by optical microscopy and scanning electron microscopy. The results show that Sn reduces the average size of vermicular graphite and promotes the generation of pearlite. Sn narrows the average lamellar spacing of pearlite. In the wear tests, CGI-Sn yields a decreased wear loss by 16.5% compared with CGI. Both CGI and CGI-Sn show typical abrasive worn morphology, while CGI presents a more severe wear condition in which large fragmentations can be seen. Under the current test condition, Sn is likely to improve the abrasive wear resistance of compacted graphite iron. Further studies of the specific working conditions are needed, such as testing against frictional material in braking systems, to check the validity of the findings.

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Development of compacted vermicular graphite cast iron for railway brake discs

Cited by 33 publications

References 9 publications

The Relationship between the Model of the Laser Biomimetic Strengthening of Gray Cast Iron and Matching between Different Brake Pads

The Relationship between the Model of the Laser Biomimetic Strengthening of Gray Cast Iron and Matching between Different Brake Pads

A Study on the Contact Pressure and Thermo-Elastic Behavior of a Brake Disc-Pad by Infrared Images and Finite Element Analysis

Abrasive Wear of Compacted Graphite Cast Iron with Added Tin

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