Pulling objects out of cohesive granular materials

Athani, Shivakumar; Rognon, Pierre

doi:10.1007/s10035-021-01126-1

Cited by 4 publications

(6 citation statements)

References 61 publications

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“…Characterizing this effect would be an important addition to RFT. Effects of multibody intrusions (24,36), density variations (37), inertial and non-inertial velocity effects (3,25,38), cohesion (39,40), and inclined domains (41) on the resistive forces experienced by intruding bodies are among other aspects for further exploration toward the ultimate goal of a generic and fast granular intrusion model applicable to terradynamical motions (8), granular impact systems (42,43), locomotors (44), and many other similar applications. This work also presents a systematic approach towards developing reduced-order models in other similar systems with a combination of mathematical analysis and experiments/simulation-based data collection.…”

Section: Discussionmentioning

confidence: 99%

Mechanistic framework for reduced-order models in soft materials: Application to three-dimensional granular intrusion

Agarwal¹,

Goldman²,

Kamrin³

2022

Preprint

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Granular intrusion is common in a range of processes including ballistic impact and penetration problems, and locomotion of humans, animals, and vehicles in natural terrains. The computational cost of full-scale numerical modeling is high, whereas a capability to model such scenarios in real-time is critical in applications such as path planning and efficient maneuvering of vehicles in sandy terrains and extraterrestrial environments. Existing reduced-order methods that model intrusion have limited capabilities due to their shape-and media-specific forms. This work formulates a reduced-order modeling technique, 3-dimensional Resistive Force Theory (3D-RFT), capable of accurately and quickly predicting the resistive force on arbitrary-shaped bodies moving in grains. Aided by a continuum mechanical description of the granular bed, a comprehensive set of symmetry constraints, and a large amount of reference data, we develop a self-consistent and accurate form for 3D-RFT. We verify the model capabilities in a wide range of cases and show it can be quickly recalibrated to different media and intruder surface types.

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Section: Discussionmentioning

confidence: 99%

Mechanistic framework for reduced-order models in soft materials: Application to three-dimensional granular intrusion

Agarwal¹,

Goldman²,

Kamrin³

2022

Preprint

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“…The resistance from the particles is mainly the granular pressure on the bottom of the rod. Based on previous works, [32,[36][37][38] a truncated cone model can describe the granular pressure as shown in Fig. 1, where the granular pressure is equal to the resultant body force of a truncated cone opening downwards from the bottom of the rod to the bottom of the granular raft, expressed as…”

Section: Stage IIImentioning

confidence: 99%

Resistance law of a rod penetrating a multilayer granular raft

Li¹,

Tian²,

Hu³

2023

Chinese Phys. B

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This paper presents an experimental study on the resistance law of a rod vertically penetrating different kinds of multilayer granular rafts with a constant velocity so as to reveal the mechanical properties of the multilayer granular rafts. The resistance was quasi-static under the chosen velocity. Experiments were conducted with different granular thicknesses, rod diameters and combinations of particles and liquids. The study shows that the resistance-displacement relation of the rod has three smooth stages. In the first stage, the resistance rapidly increased. In the second stage, the resistance curve maintained an almost constant slope. In the third stage, the resistance smoothly changed with its slope continuously increasing. Based on the corresponding physical models for each stage, the study reveals the exponential dependence of the load-bearing capacity of the multilayer granular raft on its thickness, and clarifies the capillary effects on the resistance law. The study extends the knowledge of the granular raft from monolayer to multilayer structure.

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“…Once an anchor moved under a loading condition, it firstly undergoes a quasi-static regime due to the rearrangement of the grains in the vicinity of the anchor. Beyond this quasi-static regime, the anchor moves more swiftly in the dynamic regime, and exhibits complicated behavior due to the interaction with the surrounding grains [4,5]. Although a common prediction of the failure process of a anchor can be easily raised, the mechanism and linking properties between the anchor and the granular assembly remain elusive due to lacking physical explanations at the particle scale.…”

Section: Introductionmentioning

confidence: 99%

“…Over the last decade, a significant number of numerical work has been performed to investigate the failure mechanism of the anchor and the linking properties between the anchor and the granular materials [5,6]. In which, the drag force is known as a principal investigator, acting on the anchor during its pullout process has been extensively studied [7,8].…”

Section: Introductionmentioning

confidence: 99%

“…Although there is a preferred concentration of the research works on the failure mechanism of the anchor within granular materials, the linking properties between the anchor and granular materials within the frustum have not been well understood due to lacking physical explanations of the interaction between such anchor and surrounding grains. Indeed, previous studies mainly focused on prediction the pullout capacity of the anchor under the action of a constant velocity applied on such anchor [4,5]. Actually, the moving speed of the anchor can be changed depending on the uplifting height, anchor size, and the conditions of granular materials.…”

Section: Introductionmentioning

confidence: 99%

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Linking dynamics between anchors and granular materials

Vo,

Nguyen

2023

IOP Conf. Ser.: Mater. Sci. Eng.

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The research quantitatively explores the linking properties between the circular plate anchor and the granular assembly during the failure process under the subject of a specified pullout force given to the anchor using three-dimensional discrete particle simulations. This circular anchor is created as a hard cluster of spherical grains and is initially buried at a depth in the granular assembly. The numerical method is constructed based on the frictional interaction force law. The linking dynamic is characterized by the variation of the drag force acting on such anchor due to interaction with grains at the bottom of the frustum which is formed during the uplifting movement of the anchor. The results show that the drag force acting on the anchor first reaches a nearly constant value corresponding to the loading phenomenon at small anchor movement, reflecting the plastic deformation of granular bed as a result of particle rearrangement, and then fluctuates in a wide range, this range increases with increasing the anchor movement as a result of the unloading/reloading events. These loading/unloading/reloading events provide evidence for the linking properties between the anchor movement and granular assembly, which are highlighted by the density and intensity of force network within the frustum.

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Pulling objects out of cohesive granular materials

Cited by 4 publications

References 61 publications

Mechanistic framework for reduced-order models in soft materials: Application to three-dimensional granular intrusion

Mechanistic framework for reduced-order models in soft materials: Application to three-dimensional granular intrusion

Resistance law of a rod penetrating a multilayer granular raft

Linking dynamics between anchors and granular materials

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