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  • 1
    Digitale Medien
    Digitale Medien
    Stress model of a wood fibre in relation to collapse (1995)
    Springer
    Wood science and technology 29 (1995), S. 363-376 
    Details
    ISSN: 1432-5225
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft , Maschinenbau
    Notizen: Summary A wood fibre cell from a Tasmanian Eucalypt is typically cylindrical in shape with a length to diameter ratio of approximately 50∶1. Early in the process of seasoning for solid timber, when the fibre lumens are still saturated, internal tension within a fibre can rise to a value high enough to cause it to physically flatten, or collapse. A stress model of a fibre cell has been developed which predicts the stress and strain distributions within the fibre wall as a function of temperature, moisture content, and fibre wall strength properties and size in the early stages of drying. This model will be used together with measurement of the behaviour of collapse prone timbers to determine conditions which will avoid collapse during seasoning.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00202584
    Standort Signatur Erwartet Verfügbarkeit
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    Artikel (Nationallizenzen)
    Volltext
  • 2
    Digitale Medien
    Digitale Medien
    Vessels as surface stress raisers during drying ofEucalyptus diversicolor F. Muell (1997)
    Springer
    Wood science and technology 31 (1997), S. 171-179 
    Details
    ISSN: 1432-5225
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft , Maschinenbau
    Notizen: Summary When surface checks form in karri (Eucalyptus diversicolor F. Muell), they almost invariably do so in the bottoms of vessels exposed on the surfaces of the boards. It is postulated that the vessels act as stress raisers, and thus surface checks form at lower values of average surface stress and strain than they would otherwise. Surface checks were seen to form at acoustic emission levels approximately one-third of those corresponding to surface check formation in other eucalypts. Analytical and finite element stress analysis techniques suggested a stress concentration factor at the bottoms of the vessels of approximately three. A trial drying of karri showed a close correlation between predicted surface instantaneous strain using the stress concentration factor found from the stress analysis in a model of drying timber, and measured acoustic emissions.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00705883
    Standort Signatur Erwartet Verfügbarkeit
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    Artikel (Nationallizenzen)
    Volltext
  • 3
    Digitale Medien
    Digitale Medien
    Collapse and internal checking in the latewood of Eucalyptus regnans F.Muell (1996)
    Springer
    Wood science and technology 30 (1996), S. 373-383 
    Details
    ISSN: 1432-5225
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft , Maschinenbau
    Notizen: Summary Tangential shrinkage was measured on longitudinal-tangential slices of separate earlywood and latewood from one board of Eucalyptus regnans F.Muell. at various temperatures. Large amounts of collapse shrinkage were measured in the latewood slices, and lesser amounts in the earlywood slices. Collapse shrinkage in the earlywood was found only when the slices were dried at temperatures above a minimum temperature (the “collapse threshold temperature”). End-coated board sections approximately 200 mm long were rapidly dried at dry-bulb temperatures below the collapse threshold temperature for earlywood. Incipient internal checks were found in the latewood of these boards. Board sections dried at higher temperatures showed internal checks starting in both early and latewood. A non-linear drying simulation model was modified to take the heterogeneous nature of wood into account. This model predicted that internal checks would form in this wood even if it were dried sufficiently slowly to avoid surface checking.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00244434
    Standort Signatur Erwartet Verfügbarkeit
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    Artikel (Nationallizenzen)
    Volltext
  • 4
    Digitale Medien
    Digitale Medien
    In-log determination of seasonability (2000)
    Springer
    Wood science and technology 34 (2000), S. 431-446 
    Details
    ISSN: 0043-7719
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft , Maschinenbau
    Notizen: Abstract A new method for determining the seasonability of timber in the log has been developed. This will allow batch processing of wood with similar seasonability characteristics to minimise drying time and drying induced degrade. The method involves cutting a 12 mm diameter core longitudinally from the end of the log, drying it under fixed conditions for 24 h, and then oven drying it. The only measurements made are three weighings of the core, and a visual inspection of the core surface. Comparison with a non-linear stress and drying model of the 24 h core drying process yields sufficient information to calculate a seasonability grade for the log.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/s002260000060
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
  • 5
    Digitale Medien
    Digitale Medien
    Vessels as surface stress raisers during drying of Eucalyptus diversicolor F. Muell (1997)
    Springer
    Wood science and technology 31 (1997), S. 171-179 
    Details
    ISSN: 0043-7719
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft , Maschinenbau
    Notizen: Summary When surface checks form in karri ( Eucalyptus diversicolor F.Muell), they almost invariably do so in the bottoms of vessels exposed on the surfaces of the boards. It is postulated that the vessels act as stress raisers, and thus surface checks form at lower values of average surface stress and strain than they would otherwise. Surface checks were seen to form at acoustic emission levels approximately one-third of those corresponding to surface check formation in other eucalypts. Analytical and finite element stress analysis techniques suggested a stress concentration factor at the bottoms of the vessels of approximately three. A trial drying of karri showed a close correlation between predicted surface instantaneous strain using the stress concentration factor found from the stress analysis in a model of drying timber, and measured acoustic emissions.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/s002260050025
    Standort Signatur Erwartet Verfügbarkeit
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    Artikel (Nationallizenzen)
    Volltext
  • 6
    Digitale Medien
    Digitale Medien
    Pre-drying of collapse prone wood free of surface and internal checking (1996)
    Springer
    Holz als Roh- und Werkstoff 54 (1996), S. 195-199 
    Details
    ISSN: 1436-736X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft , Maschinenbau
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/s001070050165
    Standort Signatur Erwartet Verfügbarkeit
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    Artikel (Nationallizenzen)
    Volltext
  • 7
    Digitale Medien
    Digitale Medien
    Collapse free pre-drying of Eucalyptus regnans F. Muell. (1995)
    Springer
    Holz als Roh- und Werkstoff 53 (1995), S. 403-406 
    Details
    ISSN: 1436-736X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft , Maschinenbau
    Beschreibung / Inhaltsverzeichnis: Eukalyptus regnans F. Muell. durchgeführt.
    Notizen: Eucalyptus regnans F. Muell.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/s001070050119
    Standort Signatur Erwartet Verfügbarkeit
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    Artikel (Nationallizenzen)
    Volltext
  • 8
    facet.materialart.
    Unbekannt
    Collapse free pre-drying of Eucalyptus regnans F. Muell (1995)
    Springer
    Details
    Publikationsdatum: 1995-11-01
    Print ISSN: 0018-3768
    Digitale ISSN: 1436-736X
    Thema: Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft , Maschinenbau
    Publiziert von Springer
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    AKTUELLE ARTIKEL
  • 9
    facet.materialart.
    Unbekannt
    Processing and wood properties of four ages of Eucalyptus obliqua (2006)
    Springer
    Details
    Publikationsdatum: 2006-08-10
    Print ISSN: 0018-3768
    Digitale ISSN: 1436-736X
    Thema: Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft , Maschinenbau
    Publiziert von Springer
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    AKTUELLE ARTIKEL
  • 10
    facet.materialart.
    Unbekannt
    Pre-drying of collapse prone wood free of surface and internal checking (1996)
    Springer
    Details
    Publikationsdatum: 1996-05-01
    Print ISSN: 0018-3768
    Digitale ISSN: 1436-736X
    Thema: Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft , Maschinenbau
    Publiziert von Springer
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    AKTUELLE ARTIKEL
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