1 citations · 1 across the 14 of their papers we have counts for
14 papers
Dilatancy-induced surface deformation in dense cohesive granular media
Huzaif Rahim, Thorsten Poeschel, Sudeshna Roy
When granular materials with interstitial liquid bridges are sheared in a split-bottom cell, a localized shear band develops, accompanied by a surface elevation. Cohesion, governed…
Shear-induced pressure anisotropy in granular materials of nonspherical particles
Huzaif Rahim, Sudeshna Roy, Thorsten Pöschel
When a granular material composed of elongated grains is sheared in a split-bottom shear cell, a pressure difference develops within the material. This pressure difference depends…
Rebound Suppression Mechanisms of Particle-Filled Flexible Shells for Small Body Landings
Tongge Wen, Xiaoyu Yang, Sudeshna Roy +2
The extremely weak gravity on small bodies makes landers prone to rebound and uncontrolled drift. To mitigate this, the Hayabusa2 mission employed a particle-filled flexible shell,…
Impact of friction and grain shape on the morphology of sheared granular media
Huzaif Rahim, Sudeshna Roy, Thorsten Pöschel
The interplay between dilatancy and particle alignment in sheared granular materials composed of non-spherical particles leads to morphological inhomogeneity. Dilatancy, driven by…
Comparison of bulk properties of wet granular materials using different capillary force approximations
Meysam Bagheri, Sudeshna Roy, Thorsten Pöschel
We perform Discrete Element Method simulations of wet granular matter in a split-bottom shear cell. To calculate the capillary forces from the liquid bridges between the grains, we…
Discrete Element Simulations of particles interacting via capillary forces using MercuryDPM
Meysam Bagheri, Sudeshna Roy, Thorsten Poeschel
We present the implementation of two advanced capillary bridge approximations within the Discrete Element Method (DEM) framework of the open-source code MercuryDPM. While MercuryDP…
Shape effects in binary mixtures of PA12 powder in additive manufacturing
Sudeshna Roy, Thorsten Pöschel
The quality of the powder spread in additive manufacturing devices depends sensitively on the particles' shapes. Here, we study powder spreading for mixtures of spherical and irreg…
Alignment-induced depression and shear thinning of anisotropic granular media
Huzaif Rahim, Vasileios Angelidakis, Thorsten Pöschel +1
When granular materials of shape-anisotropic grains are sheared in a split-bottom shear cell, a localized shear band is formed with a depression at its center. This effect is close…
Combined thermal and particle shape effects on powder spreading in additive manufacturing via discrete element simulations
Sudeshna Roy, Hongyi Xiao, Vasileios Angelidakis +1
The thermal and mechanical behaviors of powders are important for various additive manufacturing technologies. For powder bed fusion, capturing the temperature profile and the pack…
SPIRAL: An Efficient Algorithm for the Integration of the Equation of Rotational Motion
Carlos Andrés del Valle, Vasileios Angelidakis, Sudeshna Roy +2
We introduce Spiral, a third-order integration algorithm for the rotational motion of extended bodies. It requires only one force calculation per time step, does not require quater…
Shear zones in granular mixtures of hard and soft particles with high and low friction
Aditya Pratap Singh, Vasileios Angelidakis, Thorsten Pöschel +1
Granular materials show inhomogeneous flows characterized by strain localization. When strain is localized in a sheared granular material, rigid regions of a nearly undeformed stat…
DEM simulation of the powder application in powder bed fusion
Vasileios Angelidakis, Michael Blank, Eric J. R. Parteli +4
The packing behavior of powders is significantly influenced by various types of inter-particle attractive forces, including adhesion and non-bonded van der Waals forces [1, 2, 3, 4…
Structural fluctuations in thin cohesive particle layers in powder-based additive manufacturing
Sudeshna Roy, Hongyi Xiao, Vasileios Angelidakis +1
Producing dense and homogeneous powder layers with smooth free surface is challenging in additive manufacturing, as interparticle cohesion can strongly affect the powder packing st…
Approximate Expressions for the Capillary Force and the Surface Area of a Liquid Bridge between Identical Spheres
Meysam Bagheri, Sudeshna Roy, Thorsten Pöschel
We consider a liquid bridge between two identical spheres and provide approximate expressions for the capillary force and the exposed surface area of the liquid bridge as functions…