3D-Moldability of Veneers Plasticized with Water and Ammonia

Fekiač, Jozef; Zemiar, J.; Gaff, Milan; Gáborík, Jozef; Gašparík, Miroslav; Marušák, Róbert

doi:10.15376/biores.10.1.866-876

Cited by 8 publications

(12 citation statements)

References 2 publications

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“…The thermal modification procedure took into account previous researches by Barcík et al (2014) and Holeček (2014). bioresources.com Gašparík et al (2015). "Screw withdrawal resistance," BioResources 10(1), 1790-1802.…”

Section: Thermal Modificationmentioning

confidence: 99%

“…The pre-drilling was carried out with a diameter of 3 mm and depth of 15 mm. Gašparík et al (2015). "Screw withdrawal resistance," BioResources 10(1), 1790-1802.…”

Section: Withdrawal Resistance Determinationmentioning

confidence: 99%

“…bioresources.com Gašparík et al (2015). "Screw withdrawal resistance," BioResources 10(1), 1790-1802.…”

Section: Peer-reviewed Articlementioning

confidence: 99%

“…8. A 95% confidence interval shows the influence of screw type on screw direct withdrawal load resistance PEER-REVIEWED ARTICLE bioresources.com Gašparík et al (2015). "Screw withdrawal resistance," BioResources 10(1), 1790-1802.…”

Section: Screw Direct Withdrawal Load Resistancementioning

confidence: 99%

“…The first sign of the modification is a darkening in coloration. In addition to a change in color, there are also changes in the primary physical and mechanical properties of the wood (Požgaj et al 1993;Vernois 2001;Yildiz et al 2006;Phuong et al 2007;Esteves and Pereira 2009;Gaff and Matlák 2014;Fekiač et al 2015). The most significant effects registered have been in wood density, dimensional stability, and moisture absorption.…”

Section: Introductionmentioning

confidence: 99%

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Impact of Thermal Modification of Spruce Wood on Screw Direct Withdrawal Load Resistance

Gašparík¹,

Barcík²,

Borůvka³

et al. 2015

BioResources

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This paper reports on the dependence of screw direct withdrawal load resistance on thermal modification of spruce wood. Screw direct withdrawal load resistance was measured in native and thermally modified spruce wood. The thermal modification was performed at three different temperatures: 140, 180, and 220 °C. Tests were carried out using two types of screws in three anatomical directions. The effect of the thermal modification was unambiguous: the screw direct withdrawal load resistance decreased with increasing modification temperatures. The largest decline 44.2% was found in the axial direction and at a temperature of 200 °C, while the lowest decrease 4.1% was found in radial direction and at temperature 140 °C for conventional screws without pre-drilling. The highest values were identified in the radial direction, and the lowest in the axial direction. While conventional screws without pre-drilled holes may be regarded as the most suitable, the selfdrilling screws achieved the lowest values.

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Section: Thermal Modificationmentioning

confidence: 99%

“…The pre-drilling was carried out with a diameter of 3 mm and depth of 15 mm. Gašparík et al (2015). "Screw withdrawal resistance," BioResources 10(1), 1790-1802.…”

Section: Withdrawal Resistance Determinationmentioning

confidence: 99%

“…bioresources.com Gašparík et al (2015). "Screw withdrawal resistance," BioResources 10(1), 1790-1802.…”

Section: Peer-reviewed Articlementioning

confidence: 99%

Section: Screw Direct Withdrawal Load Resistancementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Impact of Thermal Modification of Spruce Wood on Screw Direct Withdrawal Load Resistance

Gašparík¹,

Barcík²,

Borůvka³

et al. 2015

BioResources

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Experimental analysis of the forming behavior of ash wood veneer with nonwoven backings

et al. 2020

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In the present study, the forming behavior of veneer with nonwoven backings was analyzed. The paper contributes to the lack of data on numerical predictions of the formability of veneers for the manufacturing of automotive trim parts. Tensile and shear tests were carried out at normal climate conditions and after water immersion to obtain material parameters for a transverse isotropic material description. The Tsai Wu failure criterion was applied to the estimation of strength under different stress combinations. Analysis of the directional deep drawing capacity of the veneer laminate was done by the Nakajima test. Stress states from biaxial to uniaxial were induced into the material depending on the geometry of the sample. Strains were evaluated locally until material failure using the digital image correlation method. Major strain was defined in the direction perpendicular to the grain. Increasing major strain was found from biaxial to uniaxial stress states. Highest strain limits were found for wet veneers tested with heated forming tools. Cracks occurred in the early wood zone for all geometries and propagated in the direction parallel to the grain. Generally, the Nakajima test is suitable for the evaluation of the formability of veneer laminate sheets. The presented data and, in general, the suggested experimental program can be used for the development and validation of veneer laminate material models for forming simulations.Publisher's Note Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.

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Roughness of Surface Created by Transversal Sawing of Spruce, Beech, and Oak Wood

Kminiak¹,

Gaff²

2015

BioResources

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The created surface irregularities, namely roughness profile Ra, after the sawing of spruce, beech, and oak wood on a sliding mitre saw with manual saw blade feeding were studied. The created surface roughness was monitored at a cut height, e, of 50 mm using three basic modes of solid wood transversal sawing (flatwise cross-cutting at φ2=90°, flatwise edge-mitre cross-cutting, and flatwise mitre cross-cutting at φ2=45°). The monitored surface was made using a sliding mitre saw with the gradual application of saw blades with 24, 40, or 60 teeth, and special saw blade with 24 teeth and a chip limiter (CL), respectively. The saw blades used had identical angle geometries. Three levels of feed force, Fp, of 15, 20, and 25 N corresponding to a range of feed forces used by different operators were used in the experiment. The roughness of sawn surfaces was significantly influenced by cutting model, wood species, type of saw blade, and feed force. The created surface roughness values were very close to the plane milling values.

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3D-Moldability of Veneers Plasticized with Water and Ammonia

Cited by 8 publications

References 2 publications

Impact of Thermal Modification of Spruce Wood on Screw Direct Withdrawal Load Resistance

Impact of Thermal Modification of Spruce Wood on Screw Direct Withdrawal Load Resistance

Experimental analysis of the forming behavior of ash wood veneer with nonwoven backings

Roughness of Surface Created by Transversal Sawing of Spruce, Beech, and Oak Wood

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