Impact behaviour of microparticles with microstructured surfaces: Experimental study and DEM simulation

Krull, Fabian; Hesse, Robert; Breuninger, Paul; Antonyuk, Sergiy

doi:10.1016/j.cherd.2018.05.033

Cited by 23 publications

(8 citation statements)

References 33 publications

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“…For the current experiments, the maximum possible impact load for a 3 mm grain is less than 0.5 N (after Zhang and Vu-Quoc [49], Aryaei et al [1]). For low velocity impacts (0.3-0.6 m/s) of soft polystyrene particles on smooth and rough steel surfaces, Krull et al [50] reported a decrease of COR for the impacts on rough surfaces which they attributed to the possible plastic deformation of polystyrene spheres. For the impacts with low impact angles, they also observed minute rebound angle (2-3 • ) for both the smooth and rough surface impacts.…”

Section: Effect Of Surface Roughness On Cormentioning

confidence: 99%

Effect of Grain Size and Surface Roughness on the Normal Coefficient of Restitution of Single Grains

2020

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The coefficient of restitution (COR) represents the fraction of pre-collision kinetic energy remained after the collision between two bodies. The COR parameter plays an important role in the discrete numerical analysis of granular flows or the design of protective barriers to reduce flow energy. This work investigated the COR for grain-block type impacts through comprehensive experiments using a custom-built impact loading apparatus. Glass balls of three different sizes were used as grains.The impact experiments were performed on three different types of materials as base blocks, namely brass, granite and rubber. Experiments on the brass block showed a decrease in COR values with increasing grain size. On the contrary, impacts on granite and rubber blocks showed an increase in COR values with increasing grain size. Additionally, the effect of surface roughness on the COR was investigated. It was revealed that the increase in surface roughness of either the grain or the block reduced the COR values due to the increased plastic deformations of surface asperities.

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Section: Effect Of Surface Roughness On Cormentioning

confidence: 99%

Effect of Grain Size and Surface Roughness on the Normal Coefficient of Restitution of Single Grains

2020

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“…The coefficient of restitution (COR) is a parameter describing the impact behavior during dynamic loading. COR is defined as the ratio of the rebound velocity and the initial velocity between two bodies after their collision [23,24]. It describes the energy dissipation E diss during the impact of two bodies by the radio of the kinetic energy after E kin,R to before the impact E kin :…”

Section: Coefficient Of Restitutionmentioning

confidence: 99%

“…In addition, a third high‐speed camera (camera 3; IDT Y8) equipped with a 12.5× distance microscope lens (MacroLens) was employed in order to resolve the contact between the surface and the pellet. This setup was developed in order to measure the restitution coefficient of small particles down to a size of 30 μm and non‐spherical pellets . With the cameras, aligned in an angle of 90° relative to each other, it is possible to record the trajectory, the rotation, and the rebound angle of the pellet during the free fall tests.…”

Section: Experimental Setups and Materialsmentioning

confidence: 99%

Contact Behavior of Microcrystalline Cellulose Pellets Depending on their Water Content

et al. 2020

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Microcrystalline cellulose pellets for oral drug delivery are often produced by a combined wet extrusion-spheronization process. During the entire process, the cylindrical as well as the spherical pellets are exposed to various stresses resulting in a change of their shape and size due to plastic deformation and breakage. In this work, the effect of moisture content of pellets on their mechanical behavior is studied. In static compression tests, the strong influence of water content on deformation behavior of pellets is confirmed. Moreover, impact tests are performed using a setup consisting of three high-speed cameras to record pellet-wall collisions. Material properties, such as stiffness, restitution coefficient, breakage force, and displacement, were analyzed depending on the water content.

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“…Many finite element modeling (FEM) studies that predict the in-flight and impact conditions for various cold spray settings can be found in the literature [11,12]. In these studies, the gas-particle interaction and impact conditions are modeled by means of complex equations as a function of physical parameters such as the gas densities, particle morphology, mechanical properties, and microstructure of coatings and/or substrate influence [13,14].…”

Section: Introductionmentioning

confidence: 99%

“…In these models, the equations can be solved by the force and momentum balances for every single particle [13,14]. Another important aspect of cold spray is heat transfer during particle deformation.…”

Section: Introductionmentioning

confidence: 99%

Powder Properties and Processing Conditions Affecting Cold Spray Deposition

et al. 2020

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The cold spray coating properties and performances are largely affected by feedstock characteristics and the employed processing parameters. Starting from experimental results obtained from the bibliographic data, the relationships between starting particles, processing conditions, and coating properties obtained by cold gas spray were analyzed. The relationships among these properties and particle velocity were described for various material systems. The effect on particle flattening, hardness, and porosity were largely described. Finally, the influence of the different parameters on the process output and on the coating properties was analytically defined through the employment of the multi-objective simulation tool modeFRONTIER. The analysis of data from the bibliography is a new trend that can also be applied to cold spray in order to analyze the effect of powder properties and spraying parameters on the cold spray (CS) process.

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Impact behaviour of microparticles with microstructured surfaces: Experimental study and DEM simulation

Cited by 23 publications

References 33 publications

Effect of Grain Size and Surface Roughness on the Normal Coefficient of Restitution of Single Grains

Effect of Grain Size and Surface Roughness on the Normal Coefficient of Restitution of Single Grains

Contact Behavior of Microcrystalline Cellulose Pellets Depending on their Water Content

Powder Properties and Processing Conditions Affecting Cold Spray Deposition

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