DEM-FEM combination for modeling and simulation of fractal metallic foams

Reyes, Christian; Béjar, L.; Carranza, Juan Carlos Gómez; Pérez, Pablo; Perez, Laetitia; Alfonso, I.

doi:10.1016/j.mtcomm.2022.105054

Cited by 3 publications

(1 citation statement)

References 27 publications

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“…The FEM focuses on reducing voids through the extrusion of aggregates and colloids, while DEM emphasizes achieving denser packing through the translation and rotation of particles [ 18 , 19 ]. Several studies have utilized the DEM to simulate the compaction process of asphalt pavements.…”

Section: Introductionmentioning

confidence: 99%

Investigation of Particle Rotation Characteristics and Compaction Quality Control of Asphalt Pavement Using the Discrete Element Method

Zhang,

Dan,

Shan

et al. 2024

Materials

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The compaction of asphalt pavement is a crucial step to ensure its service life. Although intelligent compaction technology can monitor compaction quality in real time, its application to individual asphalt surface courses still faces limitations. Therefore, it is necessary to study the compaction mechanism of asphalt pavements from the particle level to optimize intelligent compaction technology. This study constructed an asphalt pavement compaction model using the Discrete Element Method (DEM). First, the changes in pavement smoothness during the compaction process were analyzed. Second, the changes in the angular velocity of the mixture and the triaxial angular velocity (TAV) of the mortar, aggregates, and mixture during vibratory compaction were examined. Finally, the correlations between the TAV amplitude and the coordination number (CN) amplitude with the compaction degree of the mixture were investigated. This study found that vibratory compaction can significantly reduce asymmetric wave deformation, improving pavement smoothness. The mixture primarily rotates in the vertical plane during the first six passes of vibratory compaction and within the horizontal plane during the seventh pass. Additionally, TAV reveals the three-dimensional dynamic rotation characteristics of the particles, and the linear relationship between its amplitude and the pavement compaction degree aids in controlling the compaction quality of asphalt pavements. Finally, the linear relationship between CN amplitude and pavement compaction degree can predict the stability of the aggregate structure. This study significantly enhances quality control in pavement compaction and advances intelligent compaction technology development.

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Section: Introductionmentioning

confidence: 99%

Investigation of Particle Rotation Characteristics and Compaction Quality Control of Asphalt Pavement Using the Discrete Element Method

Zhang,

Dan,

Shan

et al. 2024

Materials

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Design, fabrication and operation of a device for manufacturing metal foams and composites by infiltration

et al. 2023

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This work presents the design and fabrication of a simple device for manufacturing metal foams and composites using infiltration. The particularities of the operation of this device are also included here, detailing examples of materials manufactured using it. This device was thought to produce composites and foams using matrices from low to medium melting points (e.g., from Mg to Cu alloys), limited to ~1200 °C. It can be used to produce samples large enough for their study and characterization, being cheaper than other devices reported in literature. Foams and composites of different sizes can be manufactured depending on the dimensions of the device, which can be modified according to the necessities. As examples, cylindrical (10 cm height and 5 cm in diameter) samples were manufactured infiltrating Al and Cu alloys on NaCl, NaCl-Al2O3 spheres mixture, and iron hollow spheres, for manufacturing respectively conventional, composite and syntactic foams. These materials were analyzed through Optical and Scanning Electron Microscopies (OM and SEM, respectively), and compression tests. Their densities and porosities were also measured. The analysis of the obtained materials revealed that following the correct experimental conditions, composites and foams without defects can be manufactured using this device. Different porosity and reinforcement percentages were obtained under these conditions, with the expected mechanical behaviors of such materials.

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Analytical Fractal Model for Effective Thermal Conductivity of Open-Cell Metallic Foams With Coated Hollow Ligaments

Xiao

Liu

et al. 2023

ASME Journal of Heat and Mass Transfer

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Coating the hollow ligaments of open-cell (fluid-through) metallic foams (MFs) fabricated via the sintering route with a thin layer of graphene can improve the effective thermal conductivity (ETC) of the foam without significantly increasing its flow resistance, potentially important for thermal storage applications. However, the Euclidean geometry cannot accurately depict the random distribution of pores within MFs. To this end, the present study aims to analyze how such thin coatings affect the ETC of MF by employing the fractal theory to depict the random distribution of its open pores. Subsequently, a cubic representative structure (RS) is chosen for self-similar pores in the fractal to establish a correlation between the geometric parameters of MF and its fractal dimension. Upon determining the thermal resistance provided a RS of the foam having coated hollow ligaments, its ETC is derived as a function of fractal dimension, dimensionless parameters of pore size, porosity, and thermal conductivity of relevant materials (e.g., ligaments, coatings, and filling medium). For validation, existing experimental data are used to compare with analytical predictions, with good agreement achieved. It is demonstrated that the ligament hollowness weakens the thermal conduction of MFs. In addition, when the coating has a thermal conductivity greater than that of ligament, the coating enhances the ability of the foam to conduct heat. Although the ligament hollowness and coating thickness are imperative factors affecting the ETC, the material makes of ligament and coating plays a decisive role in the ETC.

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DEM-FEM combination for modeling and simulation of fractal metallic foams

Cited by 3 publications

References 27 publications

Investigation of Particle Rotation Characteristics and Compaction Quality Control of Asphalt Pavement Using the Discrete Element Method

Investigation of Particle Rotation Characteristics and Compaction Quality Control of Asphalt Pavement Using the Discrete Element Method

Design, fabrication and operation of a device for manufacturing metal foams and composites by infiltration

Analytical Fractal Model for Effective Thermal Conductivity of Open-Cell Metallic Foams With Coated Hollow Ligaments

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