Characterization of shear behaviour in consolidated granular biomass

Stasiak, Mateusz; Molenda, M.; Gancarz, Marek; Wiącek, Joanna; Parafiniuk, Piotr; Lisowski, A.

doi:10.1016/j.powtec.2017.12.037

Cited by 17 publications

(21 citation statements)

References 28 publications

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“…Knowledge of its mechanical properties is necessary for the design and efficient operation of equipment for handling, storage, and processing (Zulfigar et al 2006;Ganesan et al 2008;Wu et al 2011;Gil et al 2013;Crawford et al 2016;Oniszczuk et al 2016). The wide range of practical requirements and extensive literature review concerning the field were presented in previous papers by Stasiak et al (2015Stasiak et al ( , 2018. The bioenergy practice requires information about density, strength parameters, and flowability.…”

Section: Introductionmentioning

confidence: 99%

“…For certain materials, flowability is used as a measure of the quality of granular product that influences its end-use value, and its magnitude characterises granular materials as either free flowing, easy flowing, cohesive, or strong cohesive. The theoretical use of strength properties of biomass materials are widely described in previous papers (Stasiak et al 2015(Stasiak et al , 2018.…”

Section: Introductionmentioning

confidence: 99%

“…Barnes and Nguyen (2001) reviewed the literature regarding technologies where the vane test had been used and gave a series of examples of its use for various materials. Some other practical examples of vane measurements are described in Stasiak et al (2018).…”

Section: Introductionmentioning

confidence: 99%

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Mechanical characteristics of pine biomass of different sizes and shapes

et al. 2019

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In the present study, the mechanical properties of granular biomass of pine origin (sawdust, shavings, long shavings and pellets) were determined. The bulk and tapped densities were determined in a cylindrical chamber. The compacted density was measured, and the influence of the moisture content on this quantity was examined in a vane tester. The flowability and strength properties were determined using a direct shear tester (Jenike box) 210 mm in diameter and standard Schulze ring shear tester. The tests in the Jenike tester complied with the Eurocode 1 procedure for normal pressure (σ n) of 15 and 30 kPa and speed of shearing of 0.17 mm s −1. Ring shear testing was conducted using a Schulze annular shear cell of 195 mm outer diameter. Tests were performed for 10 and 20 kPa pre-shear σ n. A prototype vane tester was constructed for determining the torque, shear strength, and relaxation of a consolidated sample of granular biomass. σ n was exerted by a pneumatic system with a rubber air spring and yoke. The torque and density were measured for moisture content in the range of 10-50% and for σ n in the range of 5-30 kPa. The torque was observed to be affected by σ n and the moisture content, whereas no relationship between the torque and the rotational speed was observed.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Mechanical characteristics of pine biomass of different sizes and shapes

et al. 2019

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“…However, some wood properties -which substantially affect the quality of wood products, such as low strength and stiffness in a direction perpendicular to its fibres, considerable variations in mechanical properties following an increase in its moisture content and wood creep as a result of its rheological properties (even at room temperatures) may result in a lack of confidence in wood as a building material. This lack of trust is mainly due to an insufficient knowledge of the mechanical properties of wood and its products (Moskaleva, 1957;Perełygin, 1957;Mareš and Blahovec, 2004;Stasiak et al, 2018). Many studies have been carried out to elucidate the mechanical properties of different kinds of wood, but most of them concerned the dry woods used in the wood and paper industries (Korkut and Guller, 2008;Lionetto and Frigione, 2009;Niklas, 1997).…”

Section: Introductionmentioning

confidence: 99%

“…This is due to the fact that normal wood structure contains both regular and irregular (non-homogenous) elements as well as wood faults. The structure of wood also determines the anisotropy of wood strength and the elastic-viscousplastic characteristics of wood as a construction material -these issues are the subject matter of a technical science, which aims to elucidate the composition of wood (Kollman, 1967;Sobolev, 1979;Miller, 1999;Thibaut et al, 2001;Mishnaevsky and Qing, 2008;Stasiak et al, 2018).…”

Section: Introductionmentioning

confidence: 99%

Influence of wood anisotropy on its mechanical properties in relation to the scale effect

Malaga-Toboła¹,

Łapka²,

Tabor³

et al. 2019

Int. Agrophys.

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As a construction material wood is characterized by many advantages: low density, a high degree of strength and stiffness, low thermal and electrical conductivity and chemical durability. However, it is an anisotropic material that contains structural elements of varying stiffness and strength. When moisture levels increase, it is characterized by the variability of its mechanical properties and creep resulting from rheological properties. Therefore, it is important to understand how the mechanical properties of wood vary depending on its heterogeneity, the orientation of the sample in relation to the directions of anisotropy and its natural disadvantages. The research material was obtained from the lumber of pine wood, which on the basis of the foursided planing process was divided into 2 groups: A, B. The wood was subjected to strength tests specifying for appropriate groups of samples respectively: modulus of elasticity in static bendinggroup A-B, static bending strength-group A-B. The influence of wood anisotropy on the elasticity and strength properties of wood was demonstrated, this results from the variability of the wood element orientation and load direction in relation to the main directions of anisotropy. K e y w o r d s: wood, structure, anisotropy, scale effects, mechanical properties

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