Numerical and Experimental Predictions of Texture-Related Influences on Rolling Resistance
Numerical and Experimental Predictions of Texture-Related Influences on Rolling Resistance
复制标题
纹理相关对滚动阻力影响的数值和实验预测
DOI：
--
复制
发表时间：
2018
期刊：
影响因子：
--
通讯作者：
H. Beckedahl
中科院分区：
文献类型：
--
作者：
D. Mansura;N. Thom;H. Beckedahl
为了克服滚动阻力（RR），由于车辆和路面因素，典型车辆平均每年消耗4152 MJ/119 L燃料。因此，表面纹理布置的轻微改进可以降低燃料消耗，带来可观的长期社会经济效益。这与美国日益严格的二氧化碳限制（2025年前为163 g/km）保持一致，以促进轮胎/路面的可持续建设/开发。本文介绍了一种多尺度的3-D数值方法来计算微变形RR和接触压痕的表面聚集到粘弹性胎面胶占负荷，速度，温度和化合物的性能。它包括一个微观尺度的胎面块单骨料模型和一个宏观尺度的汽车轮胎有限元模型，滚动在一个刚性光滑表面上的稳态模式。表面纹理是理想化的半球形压头。微失真RR估计值基于接触力和每颗结石的能量损失。计算的接触/法向力的峰值显着由于粘弹性效应在轮胎表面接触阶段的开始，随后是一个逐渐松弛的应力区域，在相互作用结束时突然释放。接触力似乎具有合理的分布和大小。结果发现，微畸变RR是较高的粗糙和稀疏的表面相比，一个光滑和更紧密的包装的情况下。为了确定总的轮胎相关RR，然后可以添加宏观失真RR。预测定性证实和调整对真实的沥青混合料的实验测试，显示出合理的协议。
To overcome rolling resistance (RR) a typical vehicle on average consumes 4152 MJ/119 L of fuel annually as a result of both vehicle and pavement factors. A slight improvement in surface texture arrangement may therefore decrease fuel consumption bringing substantial long-term socio-economic benefits. This aligns with ever-tighter limits on CO2 in the USA (163 g/km until 2025) fostering sustainable construction/exploitation of tires/pavements. This paper describes a multi-scale 3-D numerical methodology to calculate micro-distortional RR and contact indentations of surface aggregates into visco-elastic tread compound accounting for loading, velocity, temperature, and compound properties. It consists of a micro-scale tread block single aggregate model and a macro-scale car tire finite element model, rolling in steady-state mode over a rigid smooth surface. The surface texture is idealized in terms of hemispherical indenters. The micro-distortional RR estimates are based on contact force and energy lost per single stone. The computed contact/normal forces peak significantly due to visco-elastic effects at the beginning of the tire–surface contact phase, followed by a gradually relaxing stress region with a sudden release at the end of the interaction. The contact forces appear to be of a reasonable distribution and magnitude. It is found that micro-distortional RR is higher on a rougher and sparsely packed surface compared with a smoother and more tightly packed case. To determine the total tire-related RR, macro-distortional RR can then be added. The predictions were qualitatively confirmed and adjusted against real bituminous mixes by experimental testing, showing a reasonable agreement.