Bending characteristics of hardwood lamellae in the elastic region

Gaff, Milan; Babiak, Marián; Vokatý, Vojtěch; Gašparík, Miroslav; Ruman, Daniel

doi:10.1016/j.compositesb.2016.12.058

Cited by 21 publications

(10 citation statements)

References 8 publications

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“…MOE values measured from the simple composites in Kutnar et al were comparable to those commercial products. Studies by Kamke (2006), Ugovšek et al (2013), and Gaff et al (2017) confirm these findings. Kamke (2006) tested three-layer composites with viscoelastic thermal compression (VTC) wood in the face layers and the MOE obtained was comparable with values for nondensified specimens.…”

Section: Introductionmentioning

confidence: 56%

“…Ugovšek et al (2013) also applied the VTC process to beech (Fagus sylvatica L.) and concluded that the performance of their three-layer composites was significantly improved to that of non-densified beech layers. Gaff et al (2017), applied 10% and 20% densification treatments to beech specimens. These treatments resulted in increased MOE values compared to non-densified specimens.…”

Section: Introductionmentioning

confidence: 99%

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Performance of three-layer composites with densified surface layers of Nothofagus pumilio and N. antarctica from Southern Patagonian forests

Schwarzkopf

Burnard

Pastur

et al. 2017

Wood Material Science & Engineering

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Nothofagus pumilio and N. antarctica forests of Southern Patagonia, Argentina are currently being managed for production of saw logs with fast growing conditions. The result of these management strategies is faster growing forests, but also an increase in the percentage of low-density wood. The motivation for this study was to find a way to valorise this low-density wood. Surface and bulk densification treatments were applied these wood species and were then applied as face layers in three-layer composites. The mechanical properties of three-layer composites were studied. The modulus of elasticity, modulus of rupture, and modulus of hardness were improved compared to many types of structural composite lumber. This increase in mechanical properties of N. pumilio and N. antarctica wood opens the possibility for its use in structural composites and added value to these otherwise underutilised and undervalued species. ARTICLE HISTORY

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Section: Introductionmentioning

confidence: 56%

Section: Introductionmentioning

confidence: 99%

Performance of three-layer composites with densified surface layers of Nothofagus pumilio and N. antarctica from Southern Patagonian forests

Schwarzkopf

Burnard

Pastur

et al. 2017

Wood Material Science & Engineering

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“…These results were due to the degradation of the structure when more aggressive thermal treatment is applied. Thermal treatments caused the increase of micro-fractures, (Ulker et al 2012, Navi and Pizzi 2015, Gašparík et al 2016, Gaff et al 2017, Pertuzzatti et al 2018) and the hot oil at 180 °C further weakened the structure because the it penetrated the surface and facilitated the heat transfer with consequent increase of degradation inside of the wood structure.…”

Section: Mechanical Propertiesmentioning

confidence: 99%

Enhancing mechanical and surface properties of Eucalyptus wood

Pertuzzatti

Tondi

Coldebella

et al. 2020

Maderas, Cienc. tecnol.

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Eucalyptus is one of the most fast-growing trees. Therefore, in the last decades it has been extensively planted and harvested so that nowadays Eucalyptus is one of the most popular trees of the planet. There are many genres of this plant and they are often treated as a large bunch of the same timber characterized by moderate mechanical and surface properties which hinder their usage for any sight application (e.g. flooring, cladding, ceiling). In this study four species of Eucalyptus: E. grandis, E. dunnii, E. cloeziana and E. tereticornis were undergone to densification through hydro-thermo-mechanical treatment (HTM) first and then to oil heat-treatment (OHT) in order to improve their mechanical properties and hydrophobicity. It was observed that low density species (E. grandis) reaches higher compression degrees while heavier species (E. tereticornis) reach densities over 800 kg/m³; however, HTM decrease the variability of the properties. Treatments at higher temperature (160 °C) involves higher compression degree, lower set-recovery and higher surface hydrophobization, but also weaker mechanical properties. The hot oil post-treatment helps to contain the springback effect and to reduce the wettability of each specimen. Densified samples present similar surface hardness. The tailored application of the two treatments improves the properties of every Eucalyptus which can gain market also for nobler end-usages.

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“…Although many boards achieved the minimum MOR values, boards produced with rind and whole stems, and some made with pith with one hot-pressing cycle showed lower IB values than the minimum requested by the EN 312:2010 standard. However, further measures in the elastic region of boards must be made to determine the actual behavior of the material under different loading conditions Gaff et al, 2017). TP150I Totora pith board made at 150°C with one hot-pressing cycle; TP150II Totora pith board made at 150°C with two hot-pressing cycles; TR150I Totora rind board made at 150°C with one hot-pressing cycle; TR150II Totora rind board made at 150°C with two hot-pressing cycles; WT150I Whole totora stem board made at 150°C with one hot-pressing cycle; WT150II Whole totora stem board made at 150°C with two hot-pressing cycles; P1 Limit value of boards of type P1; P2 Limit value of boards of type P2.…”

Section: Color Of Binderless Boards Obtained From Each Tissuementioning

confidence: 99%

“…Wood-based products industries are likely to face some upcoming problems due to the increasing price of wood, land pressure, and shortage of wood supply. These concerns have encouraged the research on alternative feedstocks to be used for producing constructive elements as a strategy to diversify the raw material sources for producing biomass-based materials with good mechanical characteristics (Gaff, Babiak, Vokatý, Gašparík, & Ruman, 2017;Hýsek, Gaff, Sikora, & Babiak, 2018;Okuda & Sato, 2004;Zhang et al, 2015). Wood boards are among the wood-based products that have experienced the highest production rate increase in the last five years (FAO, 2018).…”

Section: Introductionmentioning

confidence: 99%

Constructive applications of totora (Schoenoplectus californicus) in binderless boards

Cordero¹,

Fernando²

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Sciences-Prague for the help and guidance received by my tutors and friends that helped me learn and grow personally and professionally during the studies and research stays conducted. To my thesis director and all the giSCI-UPM team for sharing their knowledge and experience. To the evaluation committee of the pre-defense for their valuable suggestions. To my friends and family, and to Lucía for her support.

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Bending characteristics of hardwood lamellae in the elastic region

Cited by 21 publications

References 8 publications

Performance of three-layer composites with densified surface layers of Nothofagus pumilio and N. antarctica from Southern Patagonian forests

Performance of three-layer composites with densified surface layers of Nothofagus pumilio and N. antarctica from Southern Patagonian forests

Enhancing mechanical and surface properties of Eucalyptus wood

Constructive applications of totora (Schoenoplectus californicus) in binderless boards

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