Discrete element modeling of deformable pinewood chips in cyclic loading test

Xia, Yidong; Lai, Zhengshou; Westover, Tyler L.; Klinger, Jordan; Huang, Hai; Chen, Qiushi

doi:10.1016/j.powtec.2018.12.072

Cited by 52 publications

(42 citation statements)

References 40 publications

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“…The porosity of the pellets was considerably lower than that of intact wood. The reduction in the porosity of the sawdust during pelletisation can be considered as a combination of two factors: continuous reduction of external pores between particles and closing of the internal pores present inside sawdust particles during the final stages of compaction [38]. At higher MC, the bulk density of the sawdust and the pellets was lower, which was most probably caused by the swelling of wood cells and/or by hydration of cellulose molecules.…”

Section: Resultsmentioning

confidence: 99%

“…The internal pores inside the particles and pores resulting from the surface roughness of the sawdust particles were not covered by this approach. To model the compaction of deformable wood chips in a cycling loading test using the DEM, Xia et al [38] set the bulk density of the intact wood as the solid density of particles and reproduced the compaction process well. Similarly, we wanted to set the bulk density of the intact wood as the solid density of the particles.…”

Section: Dem Modelling Parametersmentioning

confidence: 99%

“…The DEM extended with the bonded particle model (BPM) considerably broadened the range of applicability of the DEM to model the internal structure and breakage of agglomerates composed of numerous particles [35,36]. The method has been applied to model the bulk behaviour of deformable biomass fibres [34], packing of flexible fibres [37], compaction of wood chips [38], durability [39], and the strength of pellets [40]. Xia et al [41] provided a comprehensive discussion of the challenges of modelling the behaviour of the bulk of complex-shaped particles of wood biomass by using the DEM.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

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: Resultsmentioning

confidence: 99%

Section: Dem Modelling Parametersmentioning

confidence: 99%

Section: Introductionmentioning

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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show abstract

“…Also on the scale of a meter, the BPM has been applied, for instance, to simulate the soil displacement in tillage [16]. Furthermore, studies of the properties of microporous materials [11] can be found in the literature just like studies of the compression of titania agglomerates [14], the fracture of brick and mor-B Kolja Jarolin kolja.jarolin@tuhh.de tar materials [27], the crack coalescence of silicon carbide ceramics [12] or cyclic loading tests of pinewood chips [33].…”

Section: Introductionmentioning

confidence: 99%

Linearization-based methods for the calibration of bonded-particle models

Jarolin

Dosta

2020

Comp. Part. Mech.

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In the work at hand, two methods for the calibration of the elastic material parameters of bonded-particle models (BPMs) are proposed. These methods are based on concepts of classical mechanics and enable a faster calibration compared to the conventional trial and error strategy. Moreover, they can be used to counter-check the consistency of the BPM. In the first method, the mathematical model is linearized and solved in a classical matrix-vector formulation similar to a finite element scheme. Further linearization in the second approach enables the direct calculation of the elastic stiffness tensor, reducing computational costs massively. To analyze the capabilities and limitations of both methods, they have been applied in three different case studies. Obtained results have shown that the new strategy allows us to significantly reduce the calculation time.

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“…Further, the utility of conventional systems has been limited to high-yield regions like the U.S. Corn Belt (Argo et al, 2013). Direct coupling of conventional biomass supply systems with sophisticated conversion processes is further complicated by the unique challenges of bulk-solids behavior in particulate systems (Bell, 2005) and the cohesive nature of compressible, elastic biomass solids (Hernandez et al, 2017;Xia et al, 2019). Recent reports indicate the operability of biorefining processes and process models remain at less than 50% due to the variable physicochemical properties of biomass (U. S. Department of Energy, 2016).…”

Section: Introductionmentioning

confidence: 99%