Determination of mechanical properties for wood pellets used in DEM simulations

Gallego, E.; Fuentes, José María; Ruíz, Ángel; Hernández-Rodrigo, Gonzalo; Rodrí­guez, Pilar Rodriguez; Ayuga, Francisco

doi:10.31545/intagr/130634

Cited by 15 publications

(11 citation statements)

References 21 publications

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“…The bond elasticity modulus E b and its strength σ c decreased as MC increased and σ z decreased. The range of variability of the bond elasticity modulus applied in the DEM simulations (Table 5) from 9.2 MPa (birch, MC = 20%, and σ z = 60 MPa) to 120 MPa (oak, MC = 8%, and σ z = 120 MPa) was consistent with a range of values (3-146 MPa) determined experimentally for wood pellets in the puncture test [51][52][53]. The approximately twofold decrease in the bond elasticity modulus with an increase in MC from 8% to 20% applied in our simulations fitted very well to the rate of decrease in pellet elasticity determined experimentally by Gallego et al [51].…”

Section: Simulation Resultssupporting

confidence: 81%

“…The range of variability of the bond elasticity modulus applied in the DEM simulations (Table 5) from 9.2 MPa (birch, MC = 20%, and σ z = 60 MPa) to 120 MPa (oak, MC = 8%, and σ z = 120 MPa) was consistent with a range of values (3-146 MPa) determined experimentally for wood pellets in the puncture test [51][52][53]. The approximately twofold decrease in the bond elasticity modulus with an increase in MC from 8% to 20% applied in our simulations fitted very well to the rate of decrease in pellet elasticity determined experimentally by Gallego et al [51]. The order of magnitude of the bond elasticity modulus (10 7 -10 8 Pa) and the corresponding range of the normal stiffness coefficient of the bond (10 10 -10 11 N m −3 ) applied in our study were similar to the values of the bond elasticity and stiffness applied in the DEM modelling of loading of pinewood chip briquettes by Xia et al [38], the durability of wood pellets found by Mahajan et al [39], and the breakage of biomass pellets studied by Gilvari et al [40].…”

Section: Simulation Resultssupporting

confidence: 81%

“…The simulations yielded good qualitative agreement of the crack profile with the experimental data, reproduction of the stress-deformation relationship during diametral compression, and agreement of the values of the simulated bond elasticity with the experimental data. Some problems encountered during the DEM modelling of sawdust and their products may have resulted from very limited access to verified experimental data for the microproperties of sawdust particles [51]. Therefore, more experimental data for micro-properties are necessary to facilitate further development of DEM modelling of these materials.…”

Section: General Remarksmentioning

confidence: 99%

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Breakage Strength of Wood Sawdust Pellets: Measurements and Modelling

Horabik¹,

Bańda²,

Józefaciuk³

et al. 2021

Materials

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Wood pellets are an important source of renewable energy. Their mechanical strength is a crucial property. In this study, the tensile strength of pellets made from oak, pine, and birch sawdust with moisture contents of 8% and 20% compacted at 60 and 120 MPa was determined in a diametral compression test. The highest tensile strength was noted for oak and the lowest for birch pellets. For all materials, the tensile strength was the highest for a moisture content of 8% and 120 MPa. All pellets exhibited a ductile breakage mode characterised by a smooth and round stress–deformation relationship without any sudden drops. Discrete element method (DEM) simulations were performed to check for the possibility of numerical reproduction of pelletisation of the sawdust and then of the pellet deformation in the diametral compression test. The pellet breakage process was successfully simulated using the DEM implemented with the bonded particle model. The simulations reproduced the results of laboratory testing well and provided deeper insight into particle–particle bonding mechanisms. Cracks were initiated close to the centre of the pellet and, as the deformation progressed, they further developed in the direction of loading.

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Section: Simulation Resultssupporting

confidence: 81%

Section: Simulation Resultssupporting

confidence: 81%

Section: General Remarksmentioning

confidence: 99%

See 1 more Smart Citation

Breakage Strength of Wood Sawdust Pellets: Measurements and Modelling

Horabik¹,

Bańda²,

Józefaciuk³

et al. 2021

Materials

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“…The corresponding tensile strength of the bonds σ c applied to the BPM model of oak and birch pellets was 36 and 10.1 MPa, respectively. The range of values of the bond elastic modulus E b that were applied to DEM simulations corresponded to the range of values determined experimentally in the puncture test of wood pellets (Gallego et al, 2020). It was found that the relative difference in the values of the bond parameters that were applied to the DEM modelling of pellets made from the sawdust of hard (oak) and soft (birch) wood materials corresponded to the relative difference in the elastic properties of intact wood for those materials presented in the literature (Kretschmann, 2010).…”

Section: Resultsmentioning

confidence: 85%

DEM modeling of wood sawdust compaction and breakage strength of pellets determined in diametral compression test

Horabik¹,

Bańda²,

Vozárová³

et al. 2023

Int. Agrophys.

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A b s t r a c t . Sawdust from six wood species typical of Eastern Europe: beech (Fagus L.), birch (Betula L.), oak (Quercus L.), pine (Pinus sylvestris L.), poplar (Populus L.) and willow (Salix L.) with a moisture content of 8% were compacted at a compressive pressure of 120 MPa in a laboratory mould with a diameter of 10 mm. Diametral compression tests were performed to determine the mechanical strength of the pellets. Discrete element method simulations were performed to reproduce the compaction process and the mechanical reaction of the pellets to diametral compression. It was found that the difference between the bulk density of the compacted and the relaxed pellets decreased with increases in the breakage strength of a pellet. The DEM simulations reproduced well the experimental data of the diametral compression test.K e y w o r d s: sawdust pellets, diametral compression, tensile strength, DEM

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“…The pine-wood pellets used in this work had an apparent mean density of 660 kg/m 3 . Table 1 shows the dimensions and moisture content as experimentally obtained by the authors [39], and the values for other properties (calorific power or apparent density without and under compaction) as provided by the manufacturer (Coterram Generation S.A.). Durability Index was also provided by the manufacturer, and it was calculated following the EN ISO 17831-1:2015 standard [40].…”

Section: Properties Of the Examined Materialsmentioning

confidence: 99%

Determination of the Angle of Repose and Coefficient of Rolling Friction for Wood Pellets

et al. 2022

Self Cite

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The determination of the angle of repose for granular materials is indispensable for their handling and the design of containers and technological processing equipment. On the other hand, computational simulations have become an essential tool to understand the micro-behavior of the granular material and to relate it with the macro-behavior. The experimental determination of the angle of repose has a fundamental role when defining the required parameters to perform realistic simulations. However, there is a lack of a standard that allows the reproducibility of the experiments when using granular materials of equivalent spherical radius greater than 2 mm, such as corn, soybeans, wheat and PLA pellets, among others. In particular, a product of growing importance in the global strategy of decarbonization of the economy is biomass pellets, whose handling operations are one of the main components for the total cost of pellets supplied to the final user. In the present work, with the aim of determining the rolling friction coefficient, the variations in the angle of repose with the drop height for biomass pellets were studied both experimentally and with simulations, and an optimal procedure for its determination was found. Then, a calibration of the coefficient of rolling friction was performed through computational simulations using the discrete element method. The accuracy of the model under different configurations was checked.

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Determination of mechanical properties for wood pellets used in DEM simulations

Cited by 15 publications

References 21 publications

Breakage Strength of Wood Sawdust Pellets: Measurements and Modelling

Breakage Strength of Wood Sawdust Pellets: Measurements and Modelling

DEM modeling of wood sawdust compaction and breakage strength of pellets determined in diametral compression test

Determination of the Angle of Repose and Coefficient of Rolling Friction for Wood Pellets

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