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 sur...

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Bibliographic Details
Published in:Granular matter 2024-05, Vol.26 (2), p.34, Article 34
Main Authors: Altuhafi, F. N., Baudet, B. A., Coop, M. R.
Format: Article
Language:English
Subjects:
Complex Fluids and Microfluidics
Contact stresses
Deformation effects
Engineering Fluid Dynamics
Engineering Thermodynamics
Foundations
Fractals
Geoengineering
Granular materials
Heat and Mass Transfer
Hydraulics
Industrial Chemistry/Chemical Engineering
Lateral loads
Load
Materials Science
Original Report
Physics
Physics and Astronomy
Plastic deformation
Pressure distribution
Soft and Granular Matter
Stiffness
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Summary: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.
ISSN:1434-5021
1434-7636
DOI:10.1007/s10035-024-01394-7