The effects of adsorbed water on dynamic mechanical properties of wood

Obataya, Eiichi; Norimoto, Misato; Gril, Joseph

doi:10.1016/s0032-3861(97)10040-4

Cited by 90 publications

(68 citation statements)

References 19 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…less than 508, on the physical, mechanical and chemical degradation has been studied by Kohara (1952Kohara ( , 1953, and more recently by Erhardt and Mecklenburg (1995), Erhardt et al (1996), Obataya (2007Obataya ( , 2009 and Froidevaux et al (2012). The results show no or small changes in the mechanical properties during ageing.…”

Section: Heat Treatment and The Accelerated Ageing Of Woodmentioning

confidence: 94%

“…Heat-treated wood is very similar to aged wood with respect to its fragile nature and improved stability. However, different effects of dry heating (oven heating) and steaming suggest that careful moisture conditioning is required for 'true' accelerated ageing (Obataya 2009). To clarify the differences between heat treatment and accelerated ageing it is important to show the effects of humidity on the viscoelastic properties of heat-treated and aged wood.…”

Section: Heat Treatment and The Accelerated Ageing Of Woodmentioning

confidence: 99%

See 1 more Smart Citation

Thermo-hydro and thermo-hydro-mechanical wood processing: An opportunity for future environmentally friendly wood products

Sandberg

Haller

Navi

2013

Wood Material Science & Engineering

256

130

View full text Add to dashboard Cite

Section: Heat Treatment and The Accelerated Ageing Of Woodmentioning

confidence: 94%

Section: Heat Treatment and The Accelerated Ageing Of Woodmentioning

confidence: 99%

Thermo-hydro and thermo-hydro-mechanical wood processing: An opportunity for future environmentally friendly wood products

Sandberg

Haller

Navi

2013

Wood Material Science & Engineering

256

130

View full text Add to dashboard Cite

“…These variations (at 20°C and 65% RH) were moderate, as extractives mostly affect EMC over the higher range of RH (Wangaard and Granados 1967). According to Obataya et al (1998Obataya et al ( , 2001) the changes in EMC after ET, MD, AC and HW extractions would induce no more than 1-2% change in tan1, and could reach about 6% for ME. Thus, MD, AC and HW increased tan1 of Padauk wood independently of minor moisture changes, and ME extraction strongly increased tan1 by itself and through a smaller additional effect due to moisture change.…”

Section: Modifications Of Damping Coefficientmentioning

confidence: 97%

Effect of extractives on vibrational properties of African Padauk (Pterocarpus soyauxii Taub.)

et al. 2010

Self Cite

View full text Add to dashboard Cite

Extractives can affect vibrational properties tan1 (damping coefficient) and E'/2 (specific Young's modulus) but this is highly dependent on species, compounds, and cellular locations. This paper investigates such effects for African Padauk (Pterocarpus soyauxii Taub.), a tropical hardwood with high extractives content and a preferred material for xylophones. 5 groups of 26 heartwood specimens with large, yet comparable, ranges in vibrational properties were extracted in different solvents. Changes in vibrational properties were set against yields of extracts and evaluation of their cellular location. Methanol (ME) reached most of compounds (13%), located about half in lumen and half in cell-wall. Water solubility was extremely low. tan1 and E'/2 were very strongly related (R 2 30.93), but native wood had abnormally low values of tan1, while extraction shifted this relation towards higher tan1 values. ME extracted heartwood became in agreement with the average of many species, and close to sapwood. Extractions increased tan1 as much as 60%, irrespective of minute moisture changes or of initial properties. Apparent E'/2 was barely changed (+2% to -4%) but, after correcting the mass contribution of extracts, was in fact slightly reduced (down to -10% for high E'/2), and increasingly so for specimens with low initial values of E'/2.

show abstract

“…We know that the archaeological wood is different in terms of chemical and physical characteristics with respect to the modern wood (Obataya 2007). Natural weathering produces a deterioration of the wood, mainly due to solar irradiation, relative humidity, temperature, and atmospheric gases (Anderson et al 1991;Sudiyani et al 1999).…”

Section: Restoration Removal Testsmentioning

confidence: 99%

Preliminary Radiocarbon Analyses of Contemporaneous and Archaeological Wood from the Ansanto Valley (Southern Italy)

et al. 2012

View full text Add to dashboard Cite

ABSTRACT. The Ansanto Valley (southern Italy) is characterized by hydrothermal phenomena, with volcanic gas emissions arising from some vents. In the 1 st millennium BC, a sanctuary dedicated to the goddess Mephitis was built but later destroyed by landslides in the valley. During archaeological excavations in the 1950s, many items were found including wooden artifacts, preserved thanks to the imbibition and subsequent mineralization of the wood tissues due to the gas emissions. Radiocarbon dating of these objects is underway at CIRCE (Centre for Isotopic Research on Cultural and Environmental Heritage), in Caserta, Italy. Unfortunately, 2 main problems arise in dating these materials. The first is possible fossil dilution caused by the C0 2 emitted from the nearby volcanic vents, which could affect the trees of the valley and also the archaeological materials. In order to determine the magnitude of the fossil dilution in the area, 14 C measurements were performed on contemporaneous wood cored from 2 oak trees growing near the vents. 14 C values measured in these samples confirmed the presence of a strong fossil dilution in the Ansanto Valley. The second problem is the restoration that the objects underwent during the last century (mostly by using modern organic substances). To investigate suitable pretreatment procedures for removing the restoration materials from the archaeological findings, contemporaneous wood was also analyzed. The wood of trees from the Ansanto Valley and from a distant village (unaffected by the Ansanto fossil dilution) were submitted to the same restoration process applied to the archaeological artifacts, followed by an "artificial weathering" process. Some archaeological materials were also tested for the removal of restoration materials. We subjected the artificially aged trees and the archaeological samples to different chemical processes. Here, we present the results of these processes. Almost all methods turned out to be suitable for the contemporaneous wood, while the results for the archaeological samples remain uncertain. For this reason, more tests are needed, concerning the "artificial weathering," the restoration, and the chemical procedure for removing the consolidation materials.

show abstract

The effects of adsorbed water on dynamic mechanical properties of wood

Cited by 90 publications

References 19 publications

Thermo-hydro and thermo-hydro-mechanical wood processing: An opportunity for future environmentally friendly wood products

Thermo-hydro and thermo-hydro-mechanical wood processing: An opportunity for future environmentally friendly wood products

Effect of extractives on vibrational properties of African Padauk (Pterocarpus soyauxii Taub.)

Preliminary Radiocarbon Analyses of Contemporaneous and Archaeological Wood from the Ansanto Valley (Southern Italy)

Contact Info

Product

Resources

About