Numerical investigation on the electrical transmission ability of a shearing powder layer

Zeng, Chaoqun; Renouf, Mathieu; Berthier, Yves; Hamdi, Ridha

doi:10.1007/s10035-016-0619-z

Cited by 8 publications

(10 citation statements)

References 15 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The time index is omitted to make pleasant reading. This solver has proved to be very robust and efficient on a large collection of heterogeneous problems [47,48,49] and benefits of a parallel version [50] to ensure reduced simulation time.…”

Section: In the Contact Framementioning

confidence: 99%

A contact dynamics code implementation for the simulation of asteroid evolution and regolith in the asteroid environment

Sánchez

Renouf

Azéma

et al. 2021

Icarus

View full text Add to dashboard Cite

Over the last decades, simulations by discrete elements methods (DEM) have proven to be a reliable analysis tool in various domains of science and engineering. By providing access to the local physical mechanisms, DEM allows the exploration of microscopic based phenomena related to particles properties and interactions in various conditions and to revisit constitutive equations consequently. The growing computer power and memory now allow us to handle large collections of grains of various shapes and sizes by DEM simulations and in particular, it offers new perspectives in the exploration of the behavior of asteroids seen as self-gravitating and cohesive granular aggregates. In this paper we describe the Contact Dynamics (CD) method, a class of DEM based on non-smooth mechanics, and its implementation in the open-source software LMGC90. In contrast to more classical approach, Hard-and Soft-Sphere DEM, the CD method is based on an implicit time integration of the equations of motion and on a non-regularized formulation of mutual exclusion between particles. This numerical strategy is particularly relevant to the study of dense granular assemblies (even of large size) because it does not introduce numerical artefacts due to contact stiffness. So that it can be used for Small Body research, we implement a parallelised kd-tree and monitor the performance of the code as it simulates a number of granular systems. We provide examples of the simulation of the accretion of self-gravitating aggregates as well as their rotational disruption. We use the routines at our disposal in the code to monitor their behaviour through the entire evolution and find agreement with previous research.

show abstract

Section: In the Contact Framementioning

confidence: 99%

A contact dynamics code implementation for the simulation of asteroid evolution and regolith in the asteroid environment

Sánchez

Renouf

Azéma

et al. 2021

Icarus

View full text Add to dashboard Cite

show abstract

“…We use the LMGC90 open-source platform initially developed in Montpellier by Jean and Dubois [14] that implement the CD method. The software benefits today from a number of contributions such as contact detection between polyhedra [15], solver parallelization with OpenMP [16], thermal and electrical coupling e↵ects [17], coupling with fluids [18] or various type of contact interactions.…”

Section: The Contact Dynamics Methods For Granular Asteroid 21 Main Ingredientsmentioning

confidence: 99%

LMGC90: a Contact Dynamics open source code for the simulation of granular asteroid with realistic regolith shapes. Application to the accretion process

et al. 2021

View full text Add to dashboard Cite

Granular asteroids are naturally occurring gravitational aggregates (rubble piles) bound together by gravitational forces. For this reason, it is reasonable to use the theoretical concepts and numerical tools developed for granular media to study them. In this paper, we extend the field of applicability of the Contact Dynamic (CD) method, a class of non smooth discrete element approach, for the simulation of three dimensional granular asteroids. The CD method is particularly relevant to address the study of dense granular assemblies of a large number of particles of complex shape and broad particles size distribution, since it does not introduces numerical artefacts due to contact stiffness. We describe how the open source software LMGC90, interfaced with an external library for the calculation of self-gravity, is used to model the accretion process of spherical and irregular polyhedral particles.

show abstract

“…Many powder lubrication parameters, such as material type, surface condition, load, speed, particle size, temperature, and adhesion, have been focused in various studies . Studying the influence of these parameters on powder lubrication can be facilitated by a test device to explore the influence of powder media in the friction interface.…”

Section: Introductionmentioning

confidence: 99%

“…[1][2][3][4][5][6] Many powder lubrication parameters, such as material type, surface condition, load, speed, particle size, temperature, and adhesion, have been focused in various studies. [7][8][9][10][11][12] Studying the influence of these parameters on powder lubrication can be facilitated by a test device to explore the influence of powder media in the friction interface. At first, Heshmat 13 studied the powder film mechanism in the friction and lubrication processes by establishing a powder lubrication test rig and determined that a powder film was formed in a narrow tribopair, which showed some characteristics that the fluid lubricant has.…”

Section: Introductionmentioning

confidence: 99%

Micro morphological observation and mechanism analysis of boundary layer evolution in mixed powder lubrication

Wang

Liu

et al. 2017

Lubrication Science

View full text Add to dashboard Cite

In mixed‐powder‐lubricated interfaces, the lubrication performance is strongly affected by evolution of the boundary layer features. Therefore, the current investigation uses a laser microscopy system to observe the behaviours of boundary layer formed on the brass specimens during the process of graphite‐lubricated 0.45 C steel (HRC56) sliding upon brass alloy (HV160). The evolution process of mixed powder lubrication can be divided into 4 typical stages: running‐in, stable, deterioration, and damage. Multiple micro phenomena are observed in the boundary layers at different stages. These include extent of layer coverage, flaking, local adhesion, lamellar shedding, blisters, pits, and abrasion damage. These phenomena indicate that the boundary layer deteriorates from full coverage to a damaged powdery film, and eventually the serious wear on metal substrate. Moreover, an interface model of mixed powder lubrication is established to explain the changes in boundary layers. The model displays that the typically micro events above are related to the quantitative degree of overlapping of the asperities between opposing surfaces. At first, many particles bear the load collectively and adapt to velocity differences through inner shearing in powder layer. Later, plastic deformation and abrasion between asperities play a major role in surface velocity accommodation, and the metal substrates bear the load more directly.

show abstract

Numerical investigation on the electrical transmission ability of a shearing powder layer

Cited by 8 publications

References 15 publications

A contact dynamics code implementation for the simulation of asteroid evolution and regolith in the asteroid environment

A contact dynamics code implementation for the simulation of asteroid evolution and regolith in the asteroid environment

LMGC90: a Contact Dynamics open source code for the simulation of granular asteroid with realistic regolith shapes. Application to the accretion process

Micro morphological observation and mechanism analysis of boundary layer evolution in mixed powder lubrication

Contact Info

Product

Resources

About