Proceedings e report - Firenze University Press

RESEARCH ON THE AGING OF WOOD IN RISH
thermal (TG, DSC) and chemical (chemical components, FT-IR spectroscopy, X-ray diffractometry)
properties are being valuated. Fig. 3 shows the process flow of the property evaluation.
Selection of samples Xylarium･Dr. Kohara collections
Dating of samples Dendrochronology (RICPN)
Radiocarbon dating (MJH)
Morphological observation
Photography Xylarium
Annual ring width Xylarium
Color Lab Xylarium
Spectral reflectance
Tissue observation Xylarium Mechanical Properties
(permanent preparation) 3~5 specimens in each condition
Bending test MOR
Making samples MOE
Bending test 2mm(T)×10mm(R)×60mm(L) :longitudinal direction Fracture toughness
2mm(L)×10mm(T)×60mm(R) :radial direction Fracture deformation
DMS 0.8mm(L)×2mm(T)×40mm(R) :radial direction (Brinnell hardness)
Dielectric property 3mm(L)×40mm(T)×40mm(R) :end grain Cutting ability (Cutting force)
(Chip shape)
Fundamental properties
(non-distractive)
Chemical Properties
Density Air dry using the specimens after bending test
Oven dry
Color Lab Thermal property DSC、TG
Spectral reflectance TMA、DMS
Infrared absorption Pyrolysis property
Dynamic property Air dry Component
Oven dry Crystallinity X-ray analysis
Dielectric property Various MC Lignin Quantitative analysis
Fig. 3 Process flow for evaluating the naturally aging wood from the cultural properties and historical buildings.
As a part of the results from the physical and mechanical properties, Fig. 4 shows the age of the
naturally aging wood samples determined by the dendrochronological dating and their equilibrium
moisture contents. The wood substances of aging wood were less accessible to moisture and the
equilibrium moisture content of the naturally aging wood decreased with an increase of the aging
period, as shown in the figure.
Fig. 5 shows the typical stress-strain curves of the aging wood of hinoki samples in the longitudinal
direction. The naturally aging wood samples showed somewhat higher strength and stiffness but less
toughness than those of control. It seems that the bending strength in the longitudinal direction of the
naturally aging wood samples does not change so much through the aging period over 1600 years,
though the values are scattered.
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