Breakdown of Reye’s theory in nanoscale wear

Garcia‐Suarez, Joaquin; Brink, Tobias; Molinari, Jean‐François

doi:10.1016/j.jmps.2023.105236

Cited by 6 publications

(5 citation statements)

References 52 publications

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“…If d Y > d no crack propagation will occur but just local plastic deformation. Similar ideas as discussed above have been presented in models of adhesive wear where big wear particles form by crack propagation in the large asperity contact regions, while small asperity contact regions deform plastically without generation of wear particles [20,21].…”

Section: Discussionmentioning

confidence: 55%

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Surface roughness induced stress concentration

Persson

2023

Preprint

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When a body is exposed to external forces large local stresses may occur at the surface because of surface roughness. Surface stress concentration is important for many application and in particular for fatigue due to pulsating external forces. For randomly rough surfaces I calculate the probability distribution of surface stress in response to a uniform external tensile stress. I present numerical simulation results for the stress distribution σ(x, y) and show that in a typical case the maximum local tensile stress may be ∼ 10 times bigger than the applied stress. I discuss the role of the stress concentration on plastic deformation and surface crack generation and propagation.

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Section: Discussionmentioning

confidence: 55%

“…In Fig. 11 we show the solution to (20) for β = 10 and 1 α = 1 µm (red curve) and 10 µm (blue curve).…”

Section: Discussionmentioning

confidence: 99%

Surface roughness induced stress concentration

Persson

2023

Preprint

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“…Similar ideas as discussed above have been presented in models of adhesive wear where big wear particles form by crack propagation in the large asperity contact regions, while small asperity contact regions deform plastically without generation of wear particles [32][33][34][35][36][37].…”

Section: Discussionmentioning

confidence: 58%

Surface Roughness-Induced Stress Concentration

Persson

2023

Tribol Lett

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When a body is exposed to external forces large local stresses may occur at the surface because of surface roughness. Surface stress concentration is important for many application and in particular for fatigue due to pulsating external forces. For randomly rough surfaces, I calculate the probability distribution of surface stress in response to a uniform external tensile stress with the displacement vector field parallel to the rough surface. I present numerical simulation results for the stress distribution $$\sigma (x,y)$$ σ ( x , y ) and show that in a typical case the maximum local tensile stress may be $$\sim 10$$ ∼ 10 times bigger than the applied stress. I discuss the role of the stress concentration on plastic deformation and surface crack generation and propagation. Graphical Abstract

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“…Recently, our group has developed molecular dynamics (MD) models with simplified potentials to enable in silico experiments in which the transition between wear regimes (from asperity plastic smoothing to fracture-induced debris creation) can be observed [ 15 – 17 ]. We used simplified potentials with tunable properties [ 18 ] as well as realistic ones (see Sect.…”

Section: Introductionmentioning

confidence: 99%

Roughness Evolution Induced by Third-Body Wear

Garcia-Suarez,

Brink,

Molinari

2024

Tribol Lett

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Surface roughness is a key factor when it comes to friction and wear, as well as to other physical properties. These phenomena are controlled by mechanisms acting at small scales, in which the topography of apparently flat surfaces is revealed. Roughness in natural surfaces has been reported to conform to self-affine statistics in a wide variety of settings (ranging from earthquake physics to micro-electro-mechanical devices), meaning that the height profile can be described using a spectrum where the amplitude is proportional to its wavelength raised to a constant power, which is related to a statistical parameter named Hurst exponent. We analyze the roughness evolution in atomistic surfaces during molecular dynamics simulations of wear. Both pairs of initially flat and initially rough surfaces in contact are worn by a third body formed by particles trapped between them during relative sliding. During the first sliding stages, the particles trapped between the first bodies scratch the surfaces. Once the former becomes coated with atoms from the latter, the wear process slows down and becomes “adhesive like.” The initial particle sizes are consistent with the minimum size to be expected for the debris, but tend to grow by material removal from the surfaces and to agglomerate. We show that, for the particular configurations under consideration, the surface roughness seems to converge to a steady state characterized by Hurst exponent close to 0.8, independently of the initial conditions.

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Breakdown of Reye’s theory in nanoscale wear

Cited by 6 publications

References 52 publications

Surface roughness induced stress concentration

Surface roughness induced stress concentration

Surface Roughness-Induced Stress Concentration

Roughness Evolution Induced by Third-Body Wear

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