Yielding and hardening of flexible fiber packings during triaxial compression

Guo, Yu; Li, Yanjie; Liu, Qingzhao; Jin, Hanhui; Xu, D.; Wassgren, Carl; Curtis, Jennifer

doi:10.48550/arxiv.1904.05013

Cited by 2 publications

(2 citation statements)

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“…Rather than take a one-size fits all approach to the modeling of bulk biomass flows, the leading order physics associated with a type of feedstock may be identified, and a suitable computational framework is constructed around it. For example, the inclusion of shape anisotropy 220−222 and flexible fiber models 223 in discrete particle methods provides a fundamental mean for resolving the particlescale geometry, which ultimately impacts bulk flow properties.…”

Section: ■ Bulk Process Modelsmentioning

confidence: 99%

Advances in Multiscale Modeling of Lignocellulosic Biomass

Ciesielski

Pecha

Lattanzi

et al. 2020

ACS Sustainable Chem. Eng.

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Applications and associated processing technologies of lignocellulosic biomass are becoming increasingly important as we endeavor to meet societal demand for fuels, chemicals, and materials from renewable resources. Meanwhile, the rapidly expanding availability and capabilities of high-performance computing present an unprecedented opportunity to accelerate development of technologies surrounding lignocellulose utilization.In order to realize this potential, suitable modeling frameworks must be constructed that effectively capture the multiscale complexity and tremendous variety exhibited by lignocellulosic materials. In our assessment of previous endeavors toward this goal, several important shortcomings have been identified: (1) the lack of multiscale integration strategies that capture emergent properties and behaviors spanning different length scales and (2) the inability of many modeling approaches to effectively capture the variability and diversity of lignocellulose that arise from both natural and process-induced sources. In this Perspective, we survey previous modeling approaches for lignocellulose and simulation processes involving its chemical and mechanical transformation and suggest opportunities for future development to enhance the utility of computational tools to address barriers to widespread adoption of a renewable bioeconomy.

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Section: ■ Bulk Process Modelsmentioning

confidence: 99%

Advances in Multiscale Modeling of Lignocellulosic Biomass

Ciesielski

Pecha

Lattanzi

et al. 2020

ACS Sustainable Chem. Eng.

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“…For non-cohesive particles, spherical or nearly spherical shapes form packings that deform plastically under shear [6][7][8][9][10]. However, packings of highly elongated and/or strongly non-convex particles show stiffening behavior under shear [11][12][13][14][15][16][17]. A dramatic illustration of this effect is the formation of free-standing walls and columns consisting of slender rods, staples, granular chains or star-shape particles [18][19][20][21][22].…”

Section: Introductionmentioning

confidence: 99%

Yielding, Rigidity, and Tensile Stress in Sheared Columns of Hexapod Granules

Zhao,

Barés,

Socolar

2020

Preprint

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Granular packings of non-convex or elongated particles can form free-standing structures like walls or arches. For some particle shapes, such as staples, the rigidity arises from interlocking of pairs of particles, but the origins of rigidity for non-interlocking particles remains unclear. We report on experiments and numerical simulations of sheared columns of "hexapods," particles consisting of three mutually orthogonal sphero-cylinders whose centers coincide. We vary the length-to-diameter aspect ratio, α, of the sphero-cylinders and subject the packings to quasistatic direct shear. For small α, we observe a finite yield stress. For large α, however, the column becomes rigid when sheared, supporting stresses that increase sharply with increasing strain. Analysis of X-ray micro-computed tomography (Micro-CT) data collected during the shear reveals that the stiffening is associated with a tilted, oblate cluster of hexapods near the nominal shear plane in which particle deformation and average contact number both increase. Simulation results show that the particles are collectively under tension along one direction even though they do not interlock pairwise. These tensions comes from contact forces carrying large torques, and they are perpendicular to the compressive stresses in the packing. They counteract the tendency to dilate, thus stabilize the particle cluster.

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Yielding and hardening of flexible fiber packings during triaxial compression

Cited by 2 publications

References 0 publications

Advances in Multiscale Modeling of Lignocellulosic Biomass

Advances in Multiscale Modeling of Lignocellulosic Biomass

Yielding, Rigidity, and Tensile Stress in Sheared Columns of Hexapod Granules

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