The asymmetrical friction mechanism that puts the curl in the curling stone

Nyberg, Harald; Alfredson, Sara; Hogmark, Sture; Jacobson, Staffan

doi:10.1016/j.wear.2013.01.051

Cited by 47 publications

(81 citation statements)

References 8 publications

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“…However, even this idea has been recently criticized, partly because the supporting experimental evidence has been argued to be limited 7 . In particular, previously reported results obtained by studying resin replicas of the scratched pebbles suggest that only the scratches due to the trailing part of the stone would be observable 6 .…”

Section: Introductionmentioning

confidence: 98%

“…Another recent theory trying to explain the phenomenon behind the curl of the curling stone is based on a “scratch-guiding” mechanism 6 . There, the idea is that the front half of the rough contact band scratches the ice, with the scratches tilted to the right or left from the propagation direction depending on the rotation direction of the stone (clockwise or counter-clockwise).…”

Section: Introductionmentioning

confidence: 99%

“…During this crossing, there would be a tendency of the leading part scratches to act as “guides” for the trailing part asperities, in analogy to the effect that should be familiar to anyone with experience in crossing tram tracks with a bicycle in an angle different from 90 degrees. This guiding mechanism would then provide a net force able to account for the observed lateral displacement 6 . However, even this idea has been recently criticized, partly because the supporting experimental evidence has been argued to be limited 7 .…”

Section: Introductionmentioning

confidence: 99%

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A surface topography analysis of the curling stone curl mechanism

Honkanen

Ovaska

Alava

et al. 2018

Sci Rep

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The curling motion of the curling stone on ice is well-known: if a small clockwise rotational velocity is imposed to the stone when it is released, in addition to the linear propagation velocity, the stone will curl to the right. A similar curl to the left is obtained by counter-clockwise rotation. This effect is widely used in the game to reach spots behind the already thrown stones, and the rotation also causes the stone to propagate in a more predictable fashion. Here, we report on novel experimental results which support one of the proposed theories to account for the curling motion of the stone, known as the “scratch-guiding theory”. By directly scanning the ice surface with a white light interferometer before and after each slide, we observed cross-scratches caused by the leading and trailing parts of the circular contact band of the linearly moving and rotating stone. By analyzing these scratches and a typical curling stone trajectory, we show that during most of the slide, the transverse force responsible for the sideways displacement of the stone is linearly proportional to the angle between these cross-scratches.

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Section: Introductionmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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A surface topography analysis of the curling stone curl mechanism

Honkanen

Ovaska

Alava

et al. 2018

Sci Rep

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“…The pressure melting is responsible for lowering the melting temperature of ice by applying a pressure. The frictional melting is generated by the heat dissipated by the friction force; this heat increases the interface temperature, and it is considered as the most relevant mechanism in the formation of water at the interface in sliding systems [2,[11][12][13][14]. The thickness of the water layer defines the lubrication regime of a given sliding system and it is influenced by temperature, normal force and sliding velocity [10,15,16].…”

Section: Introductionmentioning

confidence: 99%

Friction of rough surfaces on ice: Experiments and modeling

Spagni

Berardo

Marchetto

et al. 2016

Wear

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Over a century of scientific research on the sliding friction of ice has not been enough to develop an exhaustive explanation for the tribological behavior of frozen water. It has been recognized that ice shows different friction regimes, but a detailed description of all the different phenomena and processes occurring at the interface, including the effect of surface roughness of both the ice and the antagonist material is still missing. In this work the effect of surface morphology on the friction of steel/ice interfaces is studied. Different degrees of random roughness on steel surfaces are introduced and the friction coefficient is measured over a wide range of temperature and sliding velocity. Correlation between the surface roughness and the lubrication regime and friction coefficient is discussed. A theoretical model is developed in order to explain this correlation, and to control the tribological behavior of the system by a proper selection of surface roughness parameters.

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“…A proposal has been made to address a possible mechanism which could be part of the reason why curling rocks curl [1]. The basic idea is as follows.…”

Section: Introductionmentioning

confidence: 99%