Abstract
Abstract
Creep-rupture studies of large specimens of commercial
oriented strandboard (OSB) were conducted using a fourpoint
flexural test in combination with an acoustic emission
(AE) monitoring system. Four equilibrium moisture
content (EMC) conditioning and testing regimens were
used: ambient room conditions, constantly moderate
EMC (12/12), dynamic rising EMC (12/24), and constant
high EMC (24/24). Compared with deflection, the cumulative
event AE parameter was found to be more sensitive
and representative to detect cumulative damage to final
failure. Under 80% ultimate stress, the 24/24 specimens
had the highest creep rate (1.43 mm h−1) as compared
with 0.27 and 0.04 mm h−1 for 12/24 and 12/12 specimens,
respectively. However, for the 12/24 specimens, a
step-like deflection occurred, accelerating the rupture
process and attaining the greatest creep factor of 2.28—a recommended safety factor for prolonged exposure to
humid service conditions. The total recovered deflection
under ambient conditions was 85% recoverable elastic,
5% recoverable viscoelastic, and 10% permanent irreversible
creep. Correspondingly, the total recovered stiffness
was 70% recoverable elastic, 10% recoverable
viscoelastic, and 20% permanent irreversible creep. The
observed creep-rupture limit of the OSB was 24 days to
failure.
Cited by
3 articles.
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