Numerical analysis of tire mobility on deformable plastic clay in saturated conditions using total and effective stress frameworks

IF 2.4 3区 工程技术 Q3 ENGINEERING, ENVIRONMENTAL
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Abstract

Modeling and performance prediction of tires on wet, plastic, cohesive soils is challenging. In wet soils, the undrained shear strength reduces as water content increases. This work aims to model highly deformable saturated clay (plastic state) to predict the short-term effect on the soil due to a single pneumatic tire pass. The external loads on the soil (total stresses) can be carried by the soil skeleton (effective stress) and/or water (pore water pressure). Fundamentally, effective stresses determine soil failure. Hence, material models can be defined using two frameworks: total and effective stress. In total stress analysis, commonly found in literature, soil and water are modeled as one medium to address rapid loading. In effective stress analysis, pore pressure evolution can be tracked through hydromechanical formulations with different drainage conditions (dry and fully saturated soils). Further, different numerical techniques (FEM, ALE, and SPH) are compared. The effective stress model captures an accumulation of excess pore water pressure after one tire pass resulting from soil non-linear behavior, which may potentially affect the tire performance of later passes. In addition, the FEM model fails at higher normal loads and slip ratios due to excessive deformation; ALE and SPH give more stable solutions for large deformations.1
利用总应力和有效应力框架对饱和条件下轮胎在可变形塑性粘土上的移动性进行数值分析
对轮胎在潮湿、塑性、粘性土壤上的性能进行建模和预测是一项挑战。在湿土中,随着含水量的增加,排水剪切强度会降低。这项工作旨在模拟高变形饱和粘土(塑性状态),以预测单个充气轮胎通过时对土壤的短期影响。土壤上的外部荷载(总应力)可由土壤骨架(有效应力)和/或水(孔隙水压力)承担。从根本上说,有效应力决定了土壤的破坏。因此,材料模型可以用两个框架来定义:总应力和有效应力。在文献中常见的总应力分析中,土壤和水被模拟为一种介质,以解决快速加载问题。在有效应力分析中,可通过不同排水条件(干燥和完全饱和土壤)下的水力学公式跟踪孔隙压力演变。此外,还对不同的数值技术(有限元、ALE 和 SPH)进行了比较。有效应力模型捕捉到了轮胎通过一次后因土壤非线性行为而产生的多余孔隙水压力的累积,这可能会影响轮胎以后的性能。此外,有限元模型在较高的法向载荷和滑移比下会因过度变形而失效;ALE 和 SPH 对大变形给出了更稳定的解决方案。
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来源期刊
Journal of Terramechanics
Journal of Terramechanics 工程技术-工程:环境
CiteScore
5.90
自引率
8.30%
发文量
33
审稿时长
15.3 weeks
期刊介绍: The Journal of Terramechanics is primarily devoted to scientific articles concerned with research, design, and equipment utilization in the field of terramechanics. The Journal of Terramechanics is the leading international journal serving the multidisciplinary global off-road vehicle and soil working machinery industries, and related user community, governmental agencies and universities. The Journal of Terramechanics provides a forum for those involved in research, development, design, innovation, testing, application and utilization of off-road vehicles and soil working machinery, and their sub-systems and components. The Journal presents a cross-section of technical papers, reviews, comments and discussions, and serves as a medium for recording recent progress in the field.
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