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A slider-crank mechanism converts rotational motion from the crank into linear motion of the slider or vice versa. This mechanism consists of three main parts: the crank, the connecting rod, and the slider. The movement of the slider-crank is an example of general plane motion as the fluctuating angle between the crank and the connecting rod. Consider a segment AB where point A is at the end of the slider and point B is on the diametrically opposite end to point A, on a crack. The variance in...
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Surface instabilities generated by a slider pulled across a granular bed.

Antoine Dop1, Valérie Vidal1, Nicolas Taberlet2

  • 1ENSL, CNRS, Laboratoire de Physique, F-69342 Lyon, France.

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A slider moving on granular material creates regular ripples. The pattern

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Area of Science:

  • Granular physics
  • Soft matter physics
  • Complex systems

Background:

  • Granular materials exhibit complex behaviors under external forces.
  • Understanding surface instabilities is crucial for predicting material transport and erosion.
  • Quasistatic dynamics of granular media are often counterintuitive.

Purpose of the Study:

  • To investigate the emergence of surface instabilities when a slider moves over a granular bed.
  • To characterize the relationship between slider properties and the generated ripple patterns.
  • To explore the influence of physical parameters on the instability dynamics.

Main Methods:

  • Experimental investigation using a conveyor belt system to drag a slider.
  • Two-dimensional discrete element method (DEM) simulations to model the granular system.
  • Systematic variation of slider parameters (mass, length, shape, velocity) and contact mechanics.

Main Results:

  • A regular pattern of peaks and troughs spontaneously forms on the granular surface.
  • The wavelength and amplitude of the ripples scale with the slider's length.
  • Ripples disappear at low and high slider masses, suggesting an optimal confining pressure.
  • Slider shape, particularly the front spatula inclination, significantly affects ripple characteristics.

Conclusions:

  • Slider-induced surface instability in granular media is a robust phenomenon.
  • Slider geometry and mass play critical roles in determining ripple formation and scale.
  • Further research is needed to fully elucidate the role of friction and cohesion at the slider-pulling device interface.