The Brinell Method for Determining Hardness of Wood Flooring Materials
TL;DR: In this paper, the ability to recover the depth of the indentation increases with increasing the hardness of the flooring material, and the permanent and temporary component of total deformation was determined.
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Abstract: We hypothesize that the ability to recovery the depth of the indentation increases with increasing the hardness of the flooring material. The research was carried out for ten lignocellulosic flooring materials: merbau, oak, maple, red oak, laminated HDF (high-density fiberboard), innovative plywood, beech, pine, peasantry, iroko. The hardness was examined using the Brinell method, and additionally, the elastic indentation of the indenter was measured during the hardness test. On this basis, the permanent (plastic) and temporary (elastic) component of total deformation was determined. Different ability to recovery was found. The harder materials were the higher percentage of elastic indentation in total indentation depth. Moreover, it was found that the measurement of the indentation diameter in wood materials is characterized by high uncertainty and measurements based on the depth of the indentation are more unambiguous and of greater practical importance, especially when testing hard lignocellulosic flooring materials.
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Citations
Efficiency of Machine Sanding of Wood
TL;DR: In this paper, the type of wood, in combination with the grit size of sandpapers, would affect sanding efficiency, and the results indicate that the factors determining sanding performance are the type and size of wood and sanding belts.
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Fine Dust Creation during Hardwood Machine Sanding
Marta Pędzik,Tomasz Rogoziński,Jerzy Majka,Kinga Stuper-Szablewska,Petar Antov,Lubos Kristak,Richard Kminiak,Martin Kučerka +7 more
TL;DR: In this article, the particle-size distribution of selected hardwood species and the content of fine particles in dust created during machine sanding were determined, which pose the highest health and safety hazards in the woodworking industry.
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Indentation Hardness and Elastic Recovery of Some Hardwood Species
TL;DR: In this paper , the authors measured the Brinell hardness (HB) of six wood species and evaluated the ability to recover the depth of the imprint (self-re-deformation) in three main reference timber cross-sections: radial (R), tangential (T), and axial/longitudinal (L).
13
Effective Diameters of Drilled Holes in Pinewood in Response to Changes in Relative Humidity
TL;DR: In this paper, the influence of moisture changes to the effective diameter of holes drilled in narrow and in wide sides of pine blanks has been investigated, and the results showed that the swelling changes of wood significantly reduced the effective hole diameter, while adsorption shrinkage changes in wood only slightly increased the effective diameters of the holes.
The Impact of Post-Manufacture Treatments on the Surface Characteristics Important for Finishing of OSB and Particleboard
TL;DR: In this article, the influence of surface treatments on hardness, roughness, wetting, water, and water vapour absorption of particleboard and oriented strand board (OSB) panels was studied.
8
References
A theoretical study of the Brinell hardness test
TL;DR: In this paper, it was shown that the tensor gradient of a potential function of the stress deviator can be expressed as a tensor tensor gradients, and that it is invariant to degree n + 1 (?> 2), but is otherwise arbitrary.
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Influence of grain angle on Brinell hardness of Scots pine (Pinus sylvestris L.)
TL;DR: In this article, the hardness of a radial surface has been studied at various angles to the grain and the relation between hardness and density at each load direction has also been studied, showing that hardness is highly dependent on grain direction.
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•Journal Article
Variation of basic density and brinell hardness within mature Finnish Betula pendula and B. Pubescens stems
TL;DR: In this paper, the variation in basic density between different horizontal and vertical locations within mature Finnish Betula pendula and B. pubescens stems was analyzed, and the dependence of Brinell hardness in radial direction on the basic density was investigated.
The effect of process parameters on the hardness of surface densified Scots pine solid wood
Abstract: This paper addresses the effect of surface densification on the Brinell hardness of Scots pine sapwood. Densification was performed in an open system under heat and compression using different compression temperatures and closing times. The hardness was measured using a modified Brinell hardness method. Furthermore, the density profiles of the samples were measured and their correlation to hardness analysed. It was found that the process parameters strongly affected the hardness of surface densified solid wood. This knowledge is relevant when optimising the densification process according to the properties required of the end-product. At 150 °C compression temperature and 0.5 min closing time, the average Brinell hardness (23.4 N/mm2) was double to that at 200 °C and 5 min closing time (11.6 N/mm2).
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