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Erschienen in: Wood Science and Technology 1/2024

22.11.2023 | Original

Effects of thermal modification on the flexure properties, fracture energy, and hardness of western hemlock

verfasst von: T. Nakagawa, E. Poulin, T. Rueppel, Z. Chen, J. Swinea, M. O’Brien, G. Houser, G. Wood, M. Weinheimer, P. Bahmani, P. Stynoski, M. Salviato

Erschienen in: Wood Science and Technology | Ausgabe 1/2024

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Abstract

This study investigates the effect of thermal modification on the flexural properties, transverse fracture energy, and hardness of western hemlock, a material which is finding increasing applications in construction. Flexure tests on specimens featuring longitudinal and transverse grains showed that thermal modification at 167 °C leads to less statistical variability compared to unmodified samples. Additionally, thermal modification leads to a decrease in the transverse flexural strength. On the other hand, the fracture and Janka hardness tests revealed a more pronounced brittleness of the thermally modified samples. In fact, the total mode I fracture energy of modified single-edge notch bending samples was about 47% lower for radial–longitudinal systems and 60% lower for tangential–longitudinal systems. Similarly, the average Janka hardness in the tangential and transverse planes was 8.5% and 9.4% lower in the modified specimens, respectively. The results presented in this work show that thermal modification can have a significant effect on the fracturing behavior of western hemlock and its energy dissipation capabilities. For design, this must be taken into serious consideration as these properties significantly influence the damage tolerance of this wood in the presence of stress concentrations such as those induced in bolted joints and cut outs. Fracture energy and hardness are also strongly correlated to ballistic performance.

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Metadaten
Titel
Effects of thermal modification on the flexure properties, fracture energy, and hardness of western hemlock
verfasst von
T. Nakagawa
E. Poulin
T. Rueppel
Z. Chen
J. Swinea
M. O’Brien
G. Houser
G. Wood
M. Weinheimer
P. Bahmani
P. Stynoski
M. Salviato
Publikationsdatum
22.11.2023
Verlag
Springer Berlin Heidelberg
Erschienen in
Wood Science and Technology / Ausgabe 1/2024
Print ISSN: 0043-7719
Elektronische ISSN: 1432-5225
DOI
https://doi.org/10.1007/s00226-023-01511-4

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