Model of Wear of Working Attachments of Earth Digging Machines upon Interaction with a Soil Mass

IF 0.5 4区工程技术 Q4 ENGINEERING, MECHANICAL

Journal of Friction and Wear Pub Date : 2022-11-23 DOI:10.3103/S1068366622040055

P. A. Grigorev, L. A. Sladkova

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Abstract—

This article describes the development of a physical and mathematical model aimed at analysis of the physical essence of surface wear of working attachments of earth digging machines on the basis of soil cutting as well as at quantitative and qualitative assessment of this process allowing us to expand the understanding of the very essence of wear. The presented model exemplified by a ripper tip allows us not only to study the mechanics of soil destruction and to assess its quantitatively, but also to reveal physical phenomena of changes in friction forces and adhesion upon contact of the working attachment surface with soil. It has been established that the lower edge of the ripper tip is exposed to the highest wear and the forces of soil moving over it are 1.6 times higher than those occurring at the upper edge of the working attachment. The model development is based on the fact that in the zone of soil compression existing for 0.8 s the motion of the working attachment towards the motion direction of the machine is insignificant, and the cutting forces increase to the level of excess of ultimate soil strength from the acting traction force of the working attachment. Then, in the course of soil dispersion for 1.8–2 s the motion speed of the working attachment in soil increases, which results in wear increase, since exactly at this time the working attachment contacts directly with soil. The performed studies allowed to take into account the issue of influence of adhesive and cohesive properties of soil during its excavation and the influence of these forces on wear of working attachments of earth digging machines.

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挖土机械工作附件与土体相互作用时的磨损模型

摘要:本文描述了一个物理和数学模型的发展，旨在分析挖土机在割土的基础上工作附件表面磨损的物理本质，并对这一过程进行定量和定性评估，使我们扩大对磨损本质的理解。以开膛手刀尖为例，所提出的模型不仅使我们能够研究土壤破坏的力学和定量评估，而且还揭示了工作附着面与土壤接触时摩擦力和附着力变化的物理现象。已经确定，开膛手尖端的下边缘受到最大的磨损，土壤在其上移动的力比在工作附件的上边缘产生的力高1.6倍。模型的建立是基于在土体压缩区存在0.8 s时，工作附件向机床运动方向的运动不明显，切削力由工作附件的作用牵引力增加到土体极限强度的超额水平。然后，在1.8-2 s的土壤分散过程中，工作附着体在土壤中的运动速度增加，导致磨损增加，因为此时工作附着体直接与土壤接触。所进行的研究允许考虑土体在开挖过程中的粘着性和内聚性的影响问题，以及这些力对挖土机械工作附件磨损的影响。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Journal of Friction and Wear ENGINEERING, MECHANICAL-MATERIALS SCIENCE, MULTIDISCIPLINARY

CiteScore

1.50

自引率

28.60%

发文量

审稿时长

6-12 weeks

期刊介绍： Journal of Friction and Wear is intended to bring together researchers and practitioners working in tribology. It provides novel information on science, practice, and technology of lubrication, wear prevention, and friction control. Papers cover tribological problems of physics, chemistry, materials science, and mechanical engineering, discussing issues from a fundamental or technological point of view.