塑性变形对颗粒材料接触行为的影响

IF 2.4 3区工程技术 Granular Matter Pub Date : 2024-03-01 DOI:10.1007/s10035-024-01394-7

F. N. Altuhafi, B. A. Baudet, M. R. Coop

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引用次数: 0

摘要

对机加工花岗岩和天然花岗岩进行的接触测试表明，在弹性粗糙表面的行为转变为弹性光滑接触的赫兹行为之前，当表面上的所有尖角都已屈服时，会发生广泛的塑性变形，并延伸到核心形状。塑性变形发生在接触处的估计最大应力达到材料硬度的 0.6 左右时，会影响正常加载时的行为，因为材料在达到这些应力后将开始以恒定刚度变形。横向加载时的塑性变形也会影响横向加载模型的适用性。数据得出的横向刚度要低得多，比现有接触模型预测的要低大约一个数量级。

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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Plastic deformation effect on contact behaviour in granular materials

Contact tests on machined and natural granite showed that extensive plastic deformation which extends to the core shape is happening before the cross-over from the behaviour of an elastic rough surface to the Hertzian behaviour of an elastic smooth contact when all asperities have yielded in the surface. The plastic deformation, which was found to take place when the estimated maximum stresses at the contact reaches about 0.6 of the material hardness, affects the behaviour during normal loading as the material will start to deform at constant stiffness after reaching these stresses. The plastic deformation during lateral loading also affects the applicability of lateral loading models. The data yielded a much lower lateral stiffness which is around one order of magnitude less than that predicted by the available contact models.

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来源期刊

Granular Matter MATERIALS SCIENCE, MULTIDISCIPLINARY-MECHANICS

CiteScore

4.30

自引率

8.30%

发文量

期刊介绍： Although many phenomena observed in granular materials are still not yet fully understood, important contributions have been made to further our understanding using modern tools from statistical mechanics, micro-mechanics, and computational science. These modern tools apply to disordered systems, phase transitions, instabilities or intermittent behavior and the performance of discrete particle simulations. >> Until now, however, many of these results were only to be found scattered throughout the literature. Physicists are often unaware of the theories and results published by engineers or other fields - and vice versa. The journal Granular Matter thus serves as an interdisciplinary platform of communication among researchers of various disciplines who are involved in the basic research on granular media. It helps to establish a common language and gather articles under one single roof that up to now have been spread over many journals in a variety of fields. Notwithstanding, highly applied or technical work is beyond the scope of this journal.