Aiming at the poor efficiency in crushing a handful of caking organic fertilizers spraying from traditional disc spreader, an improved spreader equipped with spike-tooth unit was designed introduction its structural composition and working principle. Also simulation experiments were carried out based on discrete element method according to solutions made before after improvement. Firstly, granu...

– The effect of surface curvature on the law relating frictional forces F with normal load L is investigated by molecular dynamics simulations as a function of surface symmetry, adhesion, and contamination. Curved, non-adhering, dry, commensurate surfaces show a linear dependency, F ∝ L, similar to dry flat commensurate or amorphous surfaces and macroscopic surfaces. In contrast, curved, non-ad...

Abstract We consider an infinite chain of particles with nonlinear elastic and dissipative nearest neighbors interactions. Assuming the existence a traveling front between uniformly compressed (or stretched) states, we obtain jump conditions relating wave speed limiting particle velocities to relative displacements at infinity. Using this result, characterise compression fronts in chains touchi...

Hertzian contact of a rigid sphere and highly deformable soft solid is investigated using integrated photoelasticity. The experiments are performed by pressing styrene 15 mm diameter against 44 × 47 mm3 cuboid made 5% wt. gelatin, inside circular polariscope, with range forces. emerging light rays processed considering that the retardation each ray carries cumulative effect traversing contact-i...

Rice buds are easily bruised or broken during sowing, which affects the seedling rate, and discrete element simulation of rice lacks an accurate model in this process. The EDEM software was used to calibrate parameters for different states bud seeds damage. Hertz-Mindlin simulate accumulation seeds. Through a series tests, interspecific static friction factor 0.644, rolling 0.062. normal contac...

This paper investigates the force transmission modes, mainly described by probability density distributions, in non-cohesive dry and cohesive wet granular materials by discrete element modeling. The critical state force transmission patterns are focused on with the contact model effect being analyzed. By shearing relatively dense and loose dry specimens to the critical state in the conventional...

AFM microor nanoindentation is a powerful technique for mapping the elasticity of materials at high resolution. When applied to soft matter, however, its accuracy is equivocal. The sources of the uncertainty can be methodological or analytical in nature. In this paper, we address the lack of practicable nonlinear elastic contact models, which frequently compels the use of Hertzian models in ana...

The Hertz contact law for two linear elastic spheres plays a very important role in the discrete element method (DEM). Within classic theory, strain energy distribution contacting is analytically derived, which states that ratio between energies stored solely dependent on their material properties, regardless of radii. This generally valid non-spherical and other cases, provided surfaces can be...

Spheres at medium interfaces are encountered in many applications, including atomic force microscopy or indentation tests. Although the Hertz theory describes contact mechanics between an elastic sphere and half-space for static loading small deformations very well, there is a need to consider density of medium, mass radiation damping dynamic obtain reliable results. In this study, analytical m...