Plastic deformation effect on contact behaviour in granular materials

Plastic deformation effect on contact behaviour in granular materials
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塑性变形对颗粒材料接触行为的影响

DOI:
10.1007/s10035-024-01394-7
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发表时间:
2024
期刊:
影响因子:
2.4
通讯作者:
Altuhafi F
Altuhafi F
中科院分区:
工程技术3区
文献类型:
--
作者:
Altuhafi F

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对加工花岗岩和天然花岗岩的接触试验表明,在从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,发生了延伸到芯形的广泛塑性变形,当表面上的所有粗糙度都屈服时。当接触处的估计最大应力达到材料硬度的约0.6时,塑性变形就会发生,这会影响正常加载期间的行为,因为材料在达到这些应力后将开始以恒定的刚度变形。侧向加载过程中的塑性变形也影响了侧向加载模型的适用性。该数据得到的横向刚度比现有接触模型预测的要低得多,大约少一个数量级。
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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DOI: 10.1680/jgele.19.00080
发表时间: 2020
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