Long-term experiments with end-cracked wooden beams

Mikael Fonselius

Research output: Contribution to journalArticleScientificpeer-review

2 Citations (Scopus)

Abstract

The duration of load effect for the fracture thoughness in mode II loading (forward shearing mode) has experimentally been determined for wood. The end-cracked beam specimens used were exposed to a constant load which corresponds to a nominal load level between 60 and 85% of the short-term capacity. The relative humidity was kept constant at 65% for two experimental series and changed cyclically between 40 and 90% for six experimental series. The length of a whole cycle was two weeks. In contrast to constant humidity conditions the time to failure was drastically reduced. For an end-cracked spruce beam loaded to 75% of its short-term capacity the lifetime was reduced from 2.5 months to 4 days.

Original languageEnglish
Pages (from-to)137 - 150
Number of pages14
JournalWood Science and Technology
Volume27
Issue number2
DOIs
Publication statusPublished - 1993
MoE publication typeA1 Journal article-refereed

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relative humidity
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Wood
Experiments
long-term experiment
effect

Cite this

Fonselius, Mikael. / Long-term experiments with end-cracked wooden beams. In: Wood Science and Technology. 1993 ; Vol. 27, No. 2. pp. 137 - 150.
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Long-term experiments with end-cracked wooden beams. / Fonselius, Mikael.

In: Wood Science and Technology, Vol. 27, No. 2, 1993, p. 137 - 150.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

T1 - Long-term experiments with end-cracked wooden beams

AU - Fonselius, Mikael

PY - 1993

Y1 - 1993

N2 - The duration of load effect for the fracture thoughness in mode II loading (forward shearing mode) has experimentally been determined for wood. The end-cracked beam specimens used were exposed to a constant load which corresponds to a nominal load level between 60 and 85% of the short-term capacity. The relative humidity was kept constant at 65% for two experimental series and changed cyclically between 40 and 90% for six experimental series. The length of a whole cycle was two weeks. In contrast to constant humidity conditions the time to failure was drastically reduced. For an end-cracked spruce beam loaded to 75% of its short-term capacity the lifetime was reduced from 2.5 months to 4 days.

AB - The duration of load effect for the fracture thoughness in mode II loading (forward shearing mode) has experimentally been determined for wood. The end-cracked beam specimens used were exposed to a constant load which corresponds to a nominal load level between 60 and 85% of the short-term capacity. The relative humidity was kept constant at 65% for two experimental series and changed cyclically between 40 and 90% for six experimental series. The length of a whole cycle was two weeks. In contrast to constant humidity conditions the time to failure was drastically reduced. For an end-cracked spruce beam loaded to 75% of its short-term capacity the lifetime was reduced from 2.5 months to 4 days.

U2 - 10.1007/BF00206231

DO - 10.1007/BF00206231

M3 - Article

VL - 27

SP - 137

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JO - Wood Science and Technology

JF - Wood Science and Technology

SN - 0043-7719

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