Fracture characteristics of acetylated young Scots pine
Forsman, Karin LU ; Serrano, Erik LU
; Danielsson, Henrik
LU
and Engqvist, Jonas
LU
(2020)
In European Journal of Wood and Wood Products
78(4).
p.693-703
- Abstract
A study on the fracture characteristics of unmodified and chemically modified Scots pine (Pinus sylvestris) is presented. The investigated material consisted of small-dimension sawn timber originating from young logs (thinnings), aged 30–40 years. The modified samples were acetylated with acetic anhydride in an industrial scale process without the use of any catalyst, reaching an acetyl content of approximately 20%. Clear wood specimens, consisting of either heartwood or sapwood, were extracted and conditioned to equilibrium at a relative humidity of 60% and a temperature of 20 °C. The fracture energy for mode I loading in tension perpendicular to the grain was determined using single edge notched beam (SENB) specimens, subjected to... (More)
A study on the fracture characteristics of unmodified and chemically modified Scots pine (Pinus sylvestris) is presented. The investigated material consisted of small-dimension sawn timber originating from young logs (thinnings), aged 30–40 years. The modified samples were acetylated with acetic anhydride in an industrial scale process without the use of any catalyst, reaching an acetyl content of approximately 20%. Clear wood specimens, consisting of either heartwood or sapwood, were extracted and conditioned to equilibrium at a relative humidity of 60% and a temperature of 20 °C. The fracture energy for mode I loading in tension perpendicular to the grain was determined using single edge notched beam (SENB) specimens, subjected to three-point bending. Additionally, the modulus of elasticity along the grain and the tensile strength perpendicular to the grain were determined for sapwood specimens. The findings demonstrated a significant decrease (between 36 and 50%) in the fracture energy for the acetylated specimens, compared to the unmodified specimens. No significant effect of the acetylation process on the modulus of elasticity, nor on the tensile strength could be concluded. This study indicates that the acetylation process used results in an increased brittleness for Scots pine. Further studies are needed to analyse why the fracture energy is impaired, and to examine whether and how current timber engineering design provisions can or should be revised to account for the increased brittleness of acetylated Scots pine.
(Less)
- author
- Forsman, Karin
LU
; Serrano, Erik
LU
; Danielsson, Henrik
LU
and Engqvist, Jonas
LU
- organization
- publishing date
- 2020-07
- type
- Contribution to journal
- publication status
- published
- subject
- in
- European Journal of Wood and Wood Products
- volume
- 78
- issue
- 4
- pages
- 11 pages
- publisher
- Springer
- external identifiers
-
- scopus:85086706207
- ISSN
- 0018-3768
- DOI
- 10.1007/s00107-020-01548-3
- project
- Modifierat trä för utomhuskonstruktioner
- Bärande utomhusträ
- language
- English
- LU publication?
- yes
- id
- 9b07e0e7-53ca-4137-b6da-070e9cf025e3
- date added to LUP
- 2020-07-10 11:43:51
- date last changed
- 2022-05-12 03:42:26
@article{9b07e0e7-53ca-4137-b6da-070e9cf025e3,
abstract = {{<p>A study on the fracture characteristics of unmodified and chemically modified Scots pine (Pinus sylvestris) is presented. The investigated material consisted of small-dimension sawn timber originating from young logs (thinnings), aged 30–40 years. The modified samples were acetylated with acetic anhydride in an industrial scale process without the use of any catalyst, reaching an acetyl content of approximately 20%. Clear wood specimens, consisting of either heartwood or sapwood, were extracted and conditioned to equilibrium at a relative humidity of 60% and a temperature of 20 °C. The fracture energy for mode I loading in tension perpendicular to the grain was determined using single edge notched beam (SENB) specimens, subjected to three-point bending. Additionally, the modulus of elasticity along the grain and the tensile strength perpendicular to the grain were determined for sapwood specimens. The findings demonstrated a significant decrease (between 36 and 50%) in the fracture energy for the acetylated specimens, compared to the unmodified specimens. No significant effect of the acetylation process on the modulus of elasticity, nor on the tensile strength could be concluded. This study indicates that the acetylation process used results in an increased brittleness for Scots pine. Further studies are needed to analyse why the fracture energy is impaired, and to examine whether and how current timber engineering design provisions can or should be revised to account for the increased brittleness of acetylated Scots pine.</p>}},
author = {{Forsman, Karin and Serrano, Erik and Danielsson, Henrik and Engqvist, Jonas}},
issn = {{0018-3768}},
language = {{eng}},
number = {{4}},
pages = {{693--703}},
publisher = {{Springer}},
series = {{European Journal of Wood and Wood Products}},
title = {{Fracture characteristics of acetylated young Scots pine}},
url = {{http://dx.doi.org/10.1007/s00107-020-01548-3}},
doi = {{10.1007/s00107-020-01548-3}},
volume = {{78}},
year = {{2020}},
}