Deformation of 3D printed agglomerates: Multiscale experimental tests and DEM simulation

Ge, Ruihuan; Ghadiri, Mojtaba; Bonakdar, Tina; Zheng, Qijun; Zhou, Zongyan; Larson, Ian; Hapgood, Karen

doi:10.1016/j.ces.2020.115526

Cited by 28 publications

(10 citation statements)

References 29 publications

(34 reference statements)

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“…1c. Several bond models have been proposed like the dual spring [23], the Euler-Bernoulli [7,26], the cohesive beam [2,74], the bonded particle [33,55], the vector-based [52], and the parallel bond [67] models. These models typically describe a rigid bond between particles that forms initially and remains until breakage occurs.…”

Section: Dem Modelingmentioning

confidence: 99%

“…The inter-particle solid bonds are modeled with a cohesive force following a Simplified Johnson-Kendall-Roberts (SJKR) model [48]. Unlike other bond models [2,7,23,26,33,52,55,67,74], the SJKR model allows the bonds to fracture and reform dynamically throughout the simulation, allowing for indefinitely long simulations with large deformations and arbitrary interactions.…”

Section: Introductionmentioning

confidence: 99%

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Discrete element modeling of planetary ice analogs: mechanical behavior upon sintering

et al. 2021

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Potentially habitable icy Ocean Worlds, such as Enceladus and Europa, are scientifically compelling worlds in the solar system and high-priority exploration targets. Future robotic exploration of Enceladus and Europa by in-situ missions would require a detailed understanding of the surface material and of the complex lander-surface interactions during locomotion or sampling. To date, numerical modeling approaches that provide insights into the icy terrain’s mechanical behavior have been lacking. In this work, we present a Discrete Element Model of porous planetary ice analogs that explicitly describes the microstructure and its evolution upon sintering. The model dimension is tuned following a Pareto-optimality analysis, the model parameters’ influence on the sample strength is investigated using a sensitivity analysis, and the model parameters are calibrated to experiments using a probabilistic method. The results indicate that the friction coefficient and the cohesion energy density at the particle-scale govern the macroscopic properties of the porous ice. Our model reveals a good correspondence between the macroscopic and bond strength evolutions, suggesting that the strengthening of porous ice results from the development of a large-scale network due to inter-particle bonding. This work sheds light on the multi-scale nature of the mechanics of planetary ice analogs and points to the importance of understanding surface strength evolution upon sintering to design robust robotic systems. Graphic abstract

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Section: Dem Modelingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Discrete element modeling of planetary ice analogs: mechanical behavior upon sintering

et al. 2021

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“…One of the most popular agglomerate models is bonded particle model (BPM), presented by Potyondy et al [26]. Ge et al [32,33] validated BPM with polymer crushing experiments with 3D printing technology, and revealed the failure laws of inter-particle bonds. Thornton et al [34], Cheng et al [35,36], Bolton et al [37], and Alonso et al [38] studied the problems of single particle crushing, complicated stress paths loading and other granular material crushing issues with BPM.…”

Section: Introductionmentioning

confidence: 99%

Analysis of One-Dimensional Compression under a Wide Range of Stress with Densely Arrayed BPM

Zhang¹,

Xu²,

Huang³

2021

Computer Modeling in Engineering &Amp; Sciences

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In this paper, the densely arrayed bonded particle model is proposed for simulation of granular materials with discrete element method (DEM) considering particle crushing. This model can solve the problem of pore calculation after the grains are crushed, and reduce the producing time of specimen. In this work, several one-dimensional compressing simulations are carried out to investigate the effect of particle crushing on mechanical properties of granular materials under a wide range of stress. The results show that the crushing process of granular materials can be divided into four different stages according to e r -log σ y curves. At the end of the second stage, there exists a yield point, after which the physical and mechanical properties of specimens will change significantly. Under extremely high stress, particle crushing will wipe some initial information of specimens, and specimens with different initial gradings and void ratios present some similar characteristics. Particle crushing has great influence on grading, lateral pressure coefficient and compressibility of granular materials, and introduce extra irreversible volume deformation, which is necessary to be considered in modelling of granular materials in wide stress range.

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“…The test specimens made of FullCure 720 material have highest tensile strength. Ge et al (2020) have applied coordinated multiscale approach for comparing and validating the mechanical properties. A DEM simulation was performed by using TBBM models to evaluate the mechanical properties.…”

Section: Introductionmentioning

confidence: 99%

Experimental and computational analysis of mechanical properties of RGD840 material manufactured through PolyJet process

Maurya¹,

Rastogi

Singh

2020

RPJ

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Purpose Nowadays, the PolyJet technique is used to fabricate low volume functional parts in engineering and biomedical applications. However, the mechanical properties of the components fabricated through this process are inferior in comparison to components fabricated through the traditional manufacturing process. This paper aims to attempt to investigate the influence of process parameters, i.e. raster angle, orientation and type of surface finish on mechanical properties of RGD840 material manufactured by the PolyJet process. Design/methodology/approach Initially, this study focuses on experimental evaluation of elastic modulus, ultimate tensile strength and percentage elongation of the material. Further detailed experimental study of true stress, true strain, and plastic strain are conducted. Computational analysis of plastic strain is performed by using finite element analysis (FEA) software ABAQUS. The value of strength coefficient (K) and strain hardening coefficient (n) is calculated by using the graphical method from the true stress-plastic strain curve. Findings It is observed that 90º raster angle, flat orientation and glossy surface are the best level of process parameters for the tensile strength, true stress and modules of elasticity of the RGD840 material and the obtained value are 27.88, 30.134 and 2891.5 MPa, respectively. The percentage elongation is maximum at 60º raster angle, flat orientation, and matte finish type and the obtained value is 23.38%. The optimum level of process parameters are 90° raster angle, Flat orientation, with Glossy surface finish. SEM analysis of the fracture surface of the tensile test specimen proves that the fracture surface is brittle in nature. Originality/value The novelty of this work lies in the fact that no attempts were made to investigate the computational investigation of mechanical properties of RGD840 material.

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Deformation of 3D printed agglomerates: Multiscale experimental tests and DEM simulation

Abstract: This is a repository copy of Deformation of 3D printed agglomerates: Multiscale experimental tests and DEM simulation.

Cited by 28 publications

References 29 publications

Discrete element modeling of planetary ice analogs: mechanical behavior upon sintering

Discrete element modeling of planetary ice analogs: mechanical behavior upon sintering

Analysis of One-Dimensional Compression under a Wide Range of Stress with Densely Arrayed BPM

Experimental and computational analysis of mechanical properties of RGD840 material manufactured through PolyJet process

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