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  • Articles  (86)
  • 2010-2014  (86)
  • 1955-1959
  • 2012  (86)
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  • Articles  (86)
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  • 2010-2014  (86)
  • 1955-1959
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  • 1
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    Editorial (2012)
    Springer
    Details
    Publication Date: 2012-12-18
    Print ISSN: 0018-3768
    Electronic ISSN: 1436-736X
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
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  • 2
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    The significance of lap-shear testing of wood adhesive bonds by means of Volkersen’s shear lag model (2012)
    Springer
    Details
    Publication Date: 2012-12-17
    Description: Lap-shear specimens of varying geometry were bonded with two different adhesives and tested. At the same time, the stress distribution along the adhesive bond lines of the examined specimens was modelled by means of Volkersen’s equation. A good agreement was found between apparent shear strength and a stress concentration factor derived from the model. Highly significant effects of adhesive stiffness were found at short overlap length and high specimen thickness.
    Print ISSN: 0018-3768
    Electronic ISSN: 1436-736X
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
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  • 3
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    Analytical cracking load estimation of Laminated Veneer Lumber (LVL) beams with holes (2012)
    Springer
    Details
    Publication Date: 2012-12-17
    Description: Predicting the load-carrying capacity of timber beams with holes cannot be performed by usual analysis methods if the failure of the beam is governed by the crack initiation and propagation around the hole at low load levels. Predicting the cracking load is an important design issue because it corresponds to the load-carrying capacity of the timber beam before the crack propagation. One of the models that can be used for the fracture formulation is that of a beam on elastic foundation. In this model a part of the beam is assumed to follow the conditions of beam with elastic foundation which has spring stiffness equal to the fracture properties of the material in the crack surface. Based on beam on elastic foundation model, the cracking load prediction is the target of the paper. Some closed form solutions for the beam with hole are presented. The formulation has been derived for two cases of pure shear and pure bending moment. Finally a semi-empirical formulation for combination of shear and bending moment in the section is presented. The model predictions are compared with the results of an experimental program showing good correlation. The analytical model can therefore be proposed for future revisions of codes of practice such as the Eurocode 5.
    Print ISSN: 0018-3768
    Electronic ISSN: 1436-736X
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
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  • 4
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    The influence of measuring resolution on the subsequent roughness parameters of sanded wood surfaces (2012)
    Springer
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    Publication Date: 2012-12-17
    Description: No recommendation was found in the literature with regard to which measuring resolution should be used when measuring wood surfaces and requirements in the general standard ISO 3274 ( 1996 ) appear too stringent. Due to its variability, wood requires longer evaluation length than recommended by ISO 4288 ( 1996 ) and combined with a high resolution will increase the matrix of data and so the time for scanning and data processing. A study was conducted on roughness profiles from sanded surfaces of oak, beech and spruce measured at different resolutions to see which is the lowest resolution that still allows accurate evaluation of the roughness parameters in real time. The effect of decreasing the resolution on roughness parameters was examined as compared with a resolution of 1 μm, which was taken as a reference. Results showed that a measuring resolution of 5 μm seems reliable for all species sanded with common grit sizes.
    Print ISSN: 0018-3768
    Electronic ISSN: 1436-736X
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
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  • 5
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    Heat-treatment with the vacuum-press dewatering method: chemical properties of the manufactured wood and the condensation water (2012)
    Springer
    Details
    Publication Date: 2012-12-17
    Description: Certain properties of wood can be improved with thermal modification, allowing its application fields to be considerably extended without the use of any chemical additives. This study focuses on the chemical investigation of hardwood (oak, beech, ash) products heat-treated with an industrial scale vacuum-press dewatering method (Vacu³) as well as on the evaluation of the parameters of the condensation water exhausted during the treatment. Wood modification was carried out at 195 and 210 °C. The pH value, loss of VOCs and total phenols were determined from the samples. Waste waters collected after the treatment cycles were investigated for pH, conductivity, COD, VOCs, total phenols and also for possible utilizable compounds. Release of VOCs from wood can be a health concern. Results show that the losses of the measured components were quite low. The composition of the highly acidic waste waters also depends on wood species, containing mostly phenolic compounds, aldehydes and acids. Possible ways for the utilization of these components need to be worked out in the future.
    Print ISSN: 0018-3768
    Electronic ISSN: 1436-736X
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
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  • 6
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    Macroscopic and microscopic monitoring of swelling of beech wood after impregnation with furfuryl alcohol (2012)
    Springer
    Details
    Publication Date: 2012-12-17
    Description: Wood furfurylation is a modification method that improves several wood properties. Thereby wood is impregnated with a solution of furfuryl alcohol, catalysts and water, in general. The objective of this study was to understand the penetration of furfuryl alcohol into wood. Furthermore, a possible relationship between the substance amount and the swelling behaviour should be determined. To this end microscopic investigations were conducted to describe the temporal process of penetration and swelling. It was found that the swelling coefficients differ at the microscopic and macroscopic level. The microscopic swelling can reach twice the values of macroscopic swelling.
    Print ISSN: 0018-3768
    Electronic ISSN: 1436-736X
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
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  • 7
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    The effect of process parameters on the hardness of surface densified Scots pine solid wood (2012)
    Springer
    Details
    Publication Date: 2012-12-17
    Description: 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/mm 2 ) was double to that at 200 °C and 5 min closing time (11.6 N/mm 2 ).
    Print ISSN: 0018-3768
    Electronic ISSN: 1436-736X
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
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  • 8
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    Relation of arabinogalactans to density, growth rate and shear strength in wood of cultivated Siberian larch (2012)
    Springer
    Details
    Publication Date: 2012-12-17
    Description: Present in high concentrations in the heartwood of Larix species, water-soluble arabinogalactans affect the density, moisture content and processing properties of larch wood. The aim of this study was to chart arabinogalactan concentration (AC) and to define the relations between arabinogalactans, and density and shear strength at different axial and radial locations in Larix sibirica Ledeb. trunks. In addition, growth rate (ring width, fibre dimensions) was compared with AC to determine the link between them. Although quite low AC levels were observed, values differed significantly between sapwood and heartwood, with a slight increasing trend from pith to mature heartwood. Variation in growth rate affected AC levels in juvenile wood only. In conclusion, AC levels were clearly lower in the studied cultivated, fast-grown Siberian larches than those measured earlier in trees of natural origin. AC had a weak correlation with growth rate and shear strength.
    Print ISSN: 0018-3768
    Electronic ISSN: 1436-736X
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
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  • 9
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    Fire performances of foam core particleboards continuously produced in a one-step process (2012)
    Springer
    Details
    Publication Date: 2012-12-17
    Description: For further progress of novel foam core particleboards, their fire performance was examined with cone calorimetry tests (ASTM E 1354-11a). Specimens with varying surface layer thicknesses, foam densities (polystyrene foam), and processing temperatures were tested. Using the initially recommended cone irradiance of 35 kW/m 2 , different flammability parameters were measured. In comparison to particleboards, the foam core panels generally had much higher heat release rates, somewhat higher heat of combustion and much higher smoke production due to the EPS-foam component of tested panels. The time to ignition and total heat release did not vary significantly among the samples, although certain trends could be explained. The effects of variations in specimen foam densities and processing temperatures on the flammability parameters were not very significant. However, the flammability properties improved towards that of the reference particleboard as the surface layer thickness increased from 3 to 5 mm.
    Print ISSN: 0018-3768
    Electronic ISSN: 1436-736X
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
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  • 10
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    Determination of settings in combined strength, stiffness and density grading of timber (2012)
    Springer
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    Publication Date: 2012-12-17
    Description: A new method is presented for the determination of settings in machine strength grading of timber. The method is compared with the European standard for “machine control” method. Numerical examples are shown based on large samples of spruce in bending from all over Europe. The proposed method gives similar values of grade determining properties and increased yields when a single indicating property is measured and timber is sorted to three grades. The method is based on strength, stiffness and density as grade determining parameters. Prediction limits on 10 % probability level are determined for all grade determining properties, and all three thresholds are met. The use of two indicating properties, one with good correlation with density, results in economically better grading results and more reliable quality of timber.
    Print ISSN: 0018-3768
    Electronic ISSN: 1436-736X
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Published by Springer
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