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Fractography of shear failure surface of softwood decayed by brown-rot fungus

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Title: Fractography of shear failure surface of softwood decayed by brown-rot fungus
Authors: Takanashi, Ryuya Browse this author
Ishihara, Wataru Browse this author
Sawata, Kei Browse this author →KAKEN DB
Sano, Yuzou Browse this author →KAKEN DB
Azuma, Tomonori Browse this author
Mori, Mitsunori Browse this author
Koizumi, Akio Browse this author →KAKEN DB
Sasaki, Yoshihisa Browse this author →KAKEN DB
Hirai, Takuro Browse this author →KAKEN DB
Keywords: Scanning electron microscopy
Failure morphology
Average roughness
Shear strength
Issue Date: Jun-2014
Publisher: Springer
Journal Title: Journal of Wood Science
Volume: 60
Issue: 3
Start Page: 186
End Page: 193
Publisher DOI: 10.1007/s10086-014-1393-3
Abstract: In order to investigate shear failure surface of decayed wood, wood pieces of ezomatsu (Picea jezoensis) were exposed to brown-rot fungus (Fomitopsis palustris), and standard shear test in radial plane was conducted. The failure surfaces were examined by scanning electron microscopy and surface roughness measurements were also conducted. Transwall failure that the crack elongated parallel to the tracheid axis was observed in the earlywood region through all phases of decay. Intrawall failure principally occurred in the latewood region on the early phase of decay. When decay progressed considerably, transwall failure that the crack elongated perpendicularly to the tracheid axis occurred. And transwall failure was also dominant failure morphology in the latewood region. Fragments of tracheids which were partly peeled out from S-2 layers were observed in some specimens. Size and appearance frequency of fragments of tracheid were smaller and lower when decay progressed. Arithmetic average roughness, which was the index of fragment size and appearance frequency, had positive correlation to shear strength ratio. Especially, line surface roughness of radial direction, which was measured across the radial files of tracheid, had the highest correlation to the shear strength ratio. The surface roughness would be a good indicator to evaluate the decay degree.
Type: article (author version)
Appears in Collections:農学院・農学研究院 (Graduate School of Agriculture / Faculty of Agriculture) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 澤田 圭

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