Effects of Chemical Components and Manufacturing Process of Cast Iron Brake Disc on its Resonant Frequency Variation

2009 ◽  
Vol 2 (2) ◽  
pp. 19-24 ◽  
Author(s):  
Jae Young Lee ◽  
Hyun Dal Park ◽  
Seong Jin Kim ◽  
Jae Min Han ◽  
Yoon Cheol Kim ◽  
...  
Keyword(s):  
Cast Iron ◽  
Resonant Frequency ◽  
Manufacturing Process ◽  
Chemical Components ◽  
Frequency Variation ◽  
Brake Disc

Energy Resource for a RFID System Based on Dynamic Features of Reddy-Levinson Beam

2020 ◽  
Author(s):  
Alireza Babaei ◽  
Johné Parker ◽  
Paria Moshaver
Keyword(s):  
Resonant Frequency ◽  
Shear Deformation ◽  
Displacement Field ◽  
Energy Harvester ◽  
Frequency Variation ◽  
Low Input ◽  
Piezoelectric Energy ◽  
Rfid System ◽  
Proposed Model ◽  
Thick Beam

Abstract Understanding the effect of design parameters on resonant frequency variation is a critically important aspect of piezoelectric energy harvester device design. As a first step in more accurately investigating the performance of a fixture designed for targeted RFID tag communication that also utilizes an energy harvesting application, this paper analyzes the variations in resonant frequency of a higher-order beam based on Reddy-Levinson theory (RLBT) under rotation effects. A long-term goal of this research is to implement an effective energy harvester on the RFID system. Part of the experimental RFID test fixture can be modeled as a beam (or beam element); thus, understanding the resonance frequency variations due to shear deformation and rotation effects is an important first step in obtaining information about the efficacy of the fixture in serving as an energy harvester. Investigating the performance of a beam also provides valuable information about the maximum power, frequency bandwidth, and tuning ability of the device that can be expected from an analogous energy harvester. For the first time, the resonant frequency variation of a rotating thick beam is investigated. Specifically, RLBT is used to verify the effects of shear deformation upon resonant frequency, and a coupled displacement field is utilized to enable tuning the potential piezoelectric energy harvester to low-input excitations by means of constraining translational and rotational movements of the system based on a linear constraint equation. Navier’s method as an analytical-numerical method is adopted to discretize the continuous system and to find resonant frequencies, respectively. Results reveal the significance of beam thickness and rotation effects of the proposed model for the purpose of minimizing energy usage. Current results are compared and verified numerically with available benchmarks to confirm a satisfactory level of accuracy. The proposed model, which is based on a coupled displacement field, can also be used to design other piezoelectric electro-mechanical-systems; e.g., vibration isolators, and vibration controllers. In other words, in an energy-scavenging system, a fundamental understanding of parameters affecting the resonant frequency can be accomplished through the presented analysis. The proposed model highlights the fact that, by adopting a proper speed factor, tuning the piezoelectric energy harvester to low-input excitations is possible. Additionally, it is observed that the rotation effect on the resonant frequency is more severe than effects of slenderness ratio. Finally, in this paper an improved model is proposed to capture the shear deformation effect, particularly for thick-beam energy harvesters, with the capability of tuning to low-input excitations.

scholarly journals Study on Laser Cladding Preparation of Bionic Surface of Cast Iron Brake Disc

2019 ◽  
Vol 1345 ◽  
pp. 032076
Author(s):  
Yong Hu ◽  
Maosen Li ◽  
Xin Liu ◽  
You Zhai ◽  
Zilong Yang ◽  
...  
Keyword(s):  
Cast Iron ◽  
Laser Cladding ◽  
Brake Disc ◽  
Bionic Surface

scholarly journals Grey Cast Iron Brake Discs Laser Cladded with Nickel-Tungsten Carbide—Friction, Wear and Airborne Wear Particle Emission

Atmosphere ◽  
2020 ◽  
Vol 11 (6) ◽  
pp. 621 ◽  
Author(s):  
Senad Dizdar ◽  
Yezhe Lyu ◽  
Conny Lampa ◽  
Ulf Olofsson
Keyword(s):  
Cast Iron ◽  
Tungsten Carbide ◽  
Wear Particle ◽  
Particle Emission ◽  
Grey Cast Iron ◽  
Wear Testing ◽  
Particle Analysis ◽  
Brake Disc ◽  
Grey Cast ◽  
Automotive Brake

Airborne wear particle emission has been investigated in a pin-on-disc tribometer equipped with particle analysis equipment. The pins are cut out from commercial powder metallurgy automotive brake pads as with and without copper content. The discs are cut out from a commercial grey cast iron automotive brake disc as cut out and as in addition to a laser cladded with a powder mix of Ni-self fluxing alloy + 60% spheroidized fused tungsten carbide and then fine-ground. Dry sliding wear testing runs under a contact pressure of 0.6 MPa, sliding velocity of 2 m/s and a total sliding distance of 14,400 m. The test results show both wear and particle emission improvement by using laser cladded discs. The laser cladded discs in comparison to the reference grey cast iron discs do not alter pin wear substantially but achieves halved mass loss and quartered specific wear. Comparing in the same way, the friction coefficient increases from 0.5 to 0.6, and the particle number concentration decreases from over 100 to some 70 (1/cm3) and the partition of particles below 7 µm is approximately halved.

Tribological behavior of laser textured nodular cast iron surface

2019 ◽  
Vol 71 (7) ◽  
pp. 949-955
Author(s):  
Yongmei Zhu ◽  
Junjie Chen ◽  
Jiajun Du ◽  
Yujie Fan ◽  
Jifei Zheng
Keyword(s):  
Cast Iron ◽  
Tribological Behavior ◽  
Surface Texturing ◽  
Nodular Cast Iron ◽  
Area Ratio ◽  
Brake System ◽  
Resin Matrix ◽  
Dry Sliding ◽  
Brake Disc ◽  
Content Type

Purpose Previous publications were mainly focused on the effect of textures under lubrication. Under dry sliding, area ratio of surface texturing (pit area ratio) and diameter of pit affect the tribological behavior. This paper aims to investigate the effect of laser surface texturing on tribological behavior of nodular cast iron under dry sliding. Design/methodology/approach Pit-like textures with different diameters and spaces were fabricated by laser on nodular cast iron (QT600-3). Using nodular cast iron (QT600-3) as the disc specimen and resin matrix composites (UCV018) as the pad specimen, the tribological test was performed with pin-on-disk reciprocating tribo-tester. Findings The coefficient of friction (COF) of the non-textured specimen was larger than that of the textured one. For the same pit diameter, a larger pit area ratio induced a slight decrease of COF, while wear volume decreased significantly. The pit diameter induced a slight decrease of COF as the pit area ratio, but its effect was weaker. Practical implications The experimental studies will help to improve the brake system such as structure modeling of brake disc. Predicting the performance and life of the brake disc in vehicle based on tribological behavior checked in test, it was proved that pit-like texture had application value in vehicle brake system. Originality/value This paper showed that the effect of pit area ratio on friction and wear was greater than that of pit diameter. The experimental results will be useful to the design on safety brake disc.

Modelling of grey cast iron for application to brake discs for heavy vehicles

2016 ◽  
Vol 231 (1) ◽  
pp. 35-49 ◽  
Author(s):  
Gaël Le Gigan ◽  
Magnus Ekh ◽  
Tore Vernersson ◽  
Roger Lundén
Keyword(s):  
Cast Iron ◽  
Elevated Temperatures ◽  
Kinematic Hardening ◽  
Frictional Heating ◽  
Material Model ◽  
Tensile Tests ◽  
Brake Disc ◽  
Brake Discs ◽  
Different Temperatures ◽  
Tension And Compression

Cast iron brake discs are commonly used in the automotive industry, and efforts are being made to gain a better understanding of the thermal and mechanical phenomena occurring at braking. The high thermomechanical loading at braking arises from interaction between the brake disc and the brake pads. Frictional heating generates elevated temperatures with a non-uniform spatial distribution often in the form of banding or hot spotting. These phenomena contribute to material fatigue and wear and possibly also to cracking. The use of advanced calibrated material models is one important step towards a reliable analysis of the mechanical behaviour and the life of brake discs. In the present study, a material model of the Gurson–Tvergaard–Needleman type is adopted, which accounts for asymmetric yielding in tension and compression, kinematic hardening effects, viscoplastic response and temperature dependence. The material model is calibrated using specimens tested in uniaxial cyclic loading for six different temperatures ranging from room temperature to 650 °C. A special testing protocol is followed which is intended to activate the different features of the material model. Validation of the model is performed by using tensile tests and thermomechanical experiments. An application example is given where a 10° sector of a brake disc is analysed using the commercial finitie element code Abaqus under a uniformly applied heat flux on the two friction surfaces. The results indicate that the friction surface of the hat side and the neck can be critical areas with respect to fatigue for the uniform heating studied.

EVALUATION OF THE HOMOGENEITY OF THE WORKING SURFACE OF CAST IRON BRAKE DISCS

Tribologia ◽  
2017 ◽  
Vol 276 (6) ◽  
pp. 33-37
Author(s):  
Grzegorz KINAL ◽  
Marta PACZKOWSKA
Keyword(s):  
Cast Iron ◽  
Corrosive Wear ◽  
Point Of View ◽  
Brake Disc ◽  
Braking Performance ◽  
Brake Pads ◽  
Braking System ◽  
Brake Discs ◽  
The One ◽  
Friction Surfaces

This article deals with the one of the most important elements of modern braking systems, which is a brake disc. A brake disc is the one of more stressed parts of the braking system, and its quality and design largely determine the braking performance of the vehicle. The article describes the technology of manufacturing disc brake pads that is important from the point of view of the wear processes occurring between two friction surfaces: the brake disc and the brake pad lining. The research of the cast iron ventilated brake disc surface measured the values of the selected roughness parameters at this site. In the context of measurements, it was also determined to be able to maintain a certain value of selected geometric parameters at a given location for the group of brake discs tested of a specific type and manufactured by a particular manufacturer. The work was carried out in the aspect of the research to create a surface layer to protect the brake discs from the effects of corrosive wear.

Residual stresses in a cast iron automotive brake disc rotor

2006 ◽  
Vol 385-386 ◽  
pp. 604-606 ◽  
Author(s):  
Maurice I. Ripley ◽  
Oliver Kirstein
Keyword(s):  
Cast Iron ◽  
Residual Stresses ◽  
Brake Disc ◽  
Automotive Brake
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