Impact of Operating Time on Selected Tribological Properties of the Friction Material in the Brake Pads of Passenger Cars

Borawski, Andrzej

doi:10.3390/ma14040884

Cited by 17 publications

(13 citation statements)

References 40 publications

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“…In addition, the proportions of these materials are not homogeneous across the entire section of the pad. Brake pads show a clear division (resulting, among other things, from production technology) into the friction layer, the interlayer (adhesive) and the back plate ( Figure 1 ) [ 19 ]. This structure causes the composition of the friction material to change as the brake pad runs out, which has a direct impact on the process of braking [ 20 , 21 ].…”

Section: Introductionmentioning

confidence: 99%

Testing Passenger Car Brake Pad Exploitation Time’s Impact on the Values of the Coefficient of Friction and Abrasive Wear Rate Using a Pin-on-Disc Method

Borawski

2022

Materials

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The braking system is one of the most important components in any motor vehicle. Its proper function in emergency situations may save road users’ lives. Today, as vehicles have more and more power at their disposal, leading to increased acceleration and maximum speed, the issue of effective braking is particularly important. It must also be noted that brakes are used in harsh conditions (water and salt, especially during winter), and must provide appropriate durability (on average, circa 30,000 km). For these reasons, many institutions conduct research aimed, among other things, at minimizing fading. However, this study looked into a different matter, focusing on how the operating conditions mentioned above, including the lifespan of brakes, impact the tribological properties of the friction pair. To achieve this, samples from brake pads were obtained (both brand new and used). Next, using a pin-on-disc tribological test, it was shown that the pads have lower coefficients of friction and abrasive wear rates. The results indicated that both parameters change in a manner that is dependent on how long the brake system has been in use.

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Section: Introductionmentioning

confidence: 99%

Testing Passenger Car Brake Pad Exploitation Time’s Impact on the Values of the Coefficient of Friction and Abrasive Wear Rate Using a Pin-on-Disc Method

Borawski

2022

Materials

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“…Most of the studies related to these tribological aspects of shoe brakes are with reference to automobiles, trains, and lifting machines [ 2 , 3 , 17 , 18 , 19 , 20 ]. Regarding the shoe brakes of overhead cranes, the temperature of the friction pair, the braking dynamics, and the control of the movement in the braking process have been studied by several authors [ 21 , 22 , 23 , 24 ].…”

Section: Theoretical Considerations Regarding the Wear Of The Brake L...mentioning

confidence: 99%

“…The drum of the brakes of overhead cranes is made from steel or cast iron and the brake lining of the shoe is made from composite materials [ 1 ]. The material, from which the brake drum is made, must have the following characteristics from a tribological point of view: high coefficient of friction; stable coefficient of friction between itself and the brake lining; wear resistance; good thermal conductivity [ 2 ].…”

Section: Introductionmentioning

confidence: 99%

Tribological Aspects Concerning the Study of Overhead Crane Brakes

et al. 2022

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The aim of the study is the tribological analysis of the crane drum brakes. A theoretical analysis of the wear processes for brake lining was performed and the coefficient of friction under tribological conditions was determined experimentally simulating the operating conditions for three types of brakes. The theoretical study of the wear was oriented towards of determining the lifetime of the brake lining. In the experimental determination of the coefficient of friction, the following parameters were taken into account: the contact pressure between the shoe and the drum; the initial speed of the brake drum; the humidity of the working environment; and the temperature of the drum-brake lining friction surfaces. After performing the experiments, a statistical analysis was conducted, that shows the amount the coefficient of friction is influenced by the previously mentioned parameters: the highest weight was humidity with a value of 35.58%, followed by temperature with a percentage of 23.95%, velocity with 4.54%, and lastly pressure with 4.19%. Furthermore, the equation that expresses the dependence between the coefficient of friction and the parameters is determined. We consider that the results obtained are important for brake manufacturers in order to improve braking efficiency and the safety of overhead cranes.

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“…As a result, Taguchi's experimental method provides a solid instrument for examining the impact of diverse process variables on brake wear when paired with ANOVA analysis [22][23][24][25][26][27][28][29]. The research aims to achieve optimal results in establishing minimum wear rates by analyzing the effect of various process variables, i.e., load, sliding distance, and sliding velocity, on copper-free semi-metallic friction material under dry sliding conditions.…”

Section: Introductionmentioning

confidence: 99%

Process Optimization of Automotive Brake Material in Dry Sliding Using Taguchi and ANOVA Techniques for Wear Control

et al. 2022

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In this paper, an investigation of the load-dependent wear behavior of copper-free semi-metallic brake material is presented. The experiments were conducted in ambient thermal settings with varying sliding velocities (3.141 m/s, 2.09 m/s, and 1.047 m/s), normal load (60 N, 50 N, and 40 N), and sliding distance (4500 m, 3000 m, and 1500 m). Taguchi’s method was used in designing experiments to examine the output through an L9 orthogonal array. ANOVA was used to identify the consequence of interactions among different constraints. It also established the significant contribution of each process factor. The objective was set as the ‘smaller is better’ criterion to find minimum wear conditions. The impact of the normal load on the wear process was found to be maximum (71.02%), followed by sliding velocity (27.84%) and sliding distance (1.14%). The optimum condition for the minimum wear rate was found at 40 N normal load, 1500 m sliding distance, and 3.14 m/s sliding velocity. The results were confirmed with validatory friction experiment runs. The resulting error was within 10% error, which verified the experiment methods. The SEM investigation of worn surfaces of pin and disc confirmed abrasive wear and adhesive wear at 60 N and 40 N, respectively.

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Impact of Operating Time on Selected Tribological Properties of the Friction Material in the Brake Pads of Passenger Cars

Cited by 17 publications

References 40 publications

Testing Passenger Car Brake Pad Exploitation Time’s Impact on the Values of the Coefficient of Friction and Abrasive Wear Rate Using a Pin-on-Disc Method

Testing Passenger Car Brake Pad Exploitation Time’s Impact on the Values of the Coefficient of Friction and Abrasive Wear Rate Using a Pin-on-Disc Method

Tribological Aspects Concerning the Study of Overhead Crane Brakes

Process Optimization of Automotive Brake Material in Dry Sliding Using Taguchi and ANOVA Techniques for Wear Control

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