A novel nonlinear nano-scale wear law for metallic brake pads†,Physical Chemistry Chemical Physics

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A novel nonlinear nano-scale wear law for metallic brake pads†
Physical Chemistry Chemical Physics ( IF 2.9 ) Pub Date : 2018-04-12 00:00:00 , DOI: 10.1039/c8cp01061g
Sandeep P. Patil _{1,

2,

3,

4} , Sri Harsha Chilakamarri _{1,

2,

3,

4} , Bernd Markert _{1,

2,

3,

4}

Affiliation

In the present work, molecular dynamics simulations were carried out to investigate the temperature distribution as well as the fundamental friction characteristics such as the coefficient of friction and wear in a disc-pad braking system. A wide range of constant velocity loadings was applied on metallic brake pads made of aluminium, copper and iron with different rotating speeds of a diamond-like carbon brake disc. The average temperature of Newtonian atoms and the coefficient of friction of the brake pad were investigated. The resulting relationship of the average temperature with the speed of the disc as well as the applied loading velocity can be described by power laws. The quantitative description of the volume lost from the brake pads was investigated, and it was found that the volume lost increases linearly with the sliding distance. Our results show that Archard's linear wear law is not applicable to a wide range of normal loads, e.g., in cases of low normal load where the wear rate was increased considerably and in cases of high load where there was a possibility of severe wear. In this work, a new formula for the brake pad wear in a disc brake assembly is proposed, which displays a power law relationship between the lost volume of the metallic brake pads per unit sliding distance and the applied normal load with an exponent of 0.62 ± 0.02. This work provides new insights into the fundamental understanding of the wear mechanism at the nano-scale leading to a new bottom-up wear law for metallic brake pads.

中文翻译：

金属制动片的新型非线性纳米尺度磨损定律†

在目前的工作中，进行了分子动力学模拟以研究温度分布以及基本摩擦特性，例如盘式制动系统的摩擦系数和磨损。在由铝，铜和铁制成的金属制的制动片上施加了各种各样的恒速负载，这些金属制的制动片具有类金刚石碳制制动盘的不同转速。研究了牛顿原子的平均温度和刹车片的摩擦系数。平均温度与光盘速度以及所施加的加载速度之间的关系可以通过幂律来描述。研究了从制动衬块损失的体积的定量描述，发现损失的体积随滑动距离线性增加。例如，在正常负载较低的情况下，磨损率会大大增加；在负载较高的情况下，则可能会出现严重磨损。在这项工作中，提出了一种用于盘式制动器组件的制动衬块磨损的新公式，该公式显示了单位滑动距离的金属制动衬块的损失体积与所施加的法向载荷之间的幂律关系，指数为0.62± 0.02。这项工作为对纳米级磨损机理的基本理解提供了新的见解，从而导致了金属刹车片的新的自下而上的磨损定律。

更新日期：2018-04-12

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