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Title:	Creep behavior of sweetgum OSB: effect of load level and relative humidity
Author(s):	Pu, J.H.; Tang, R.C.; Hse, Chung-Yun
Date:	1994
Source:	Forest Products Journal, Vol. 44(11/12): 45-50
Description:	Flexural creep behavior of laboratory-fabricated sweetgum oriented strandboard (OSB). under constnat (65% and 95%) and cyclic (65% <-> 95% at a 96-hr. frequency) relative humidity (RH) conditions at 75 F (23.9 C) is presented. Two levels (4.5% and 6.5%) of resin content (RC) of phenol-formaldehyde were used in fabricating the test panels. Two load levels (20% and 40% of the modulus of rupture (MOR)) were chosen for the investigation. Load duragion was 12 weeks followed by a 3-week recovery under constant 65 percent RH at 75 F. Constant high RH (95%) as well as the cyclic RH (65% <-> 95%) showed a great influence on the creep resistance and relative creep. At constant low RH (65%), improvement of relative creep was observed when the RC was increased from 4.5 to 6.5 percent. The load-duration effect (creep-rupture) became evident when the load level was increased from 20 to 40 percent MOR under constant 95 percent or cyclic 65 <-> 95 percent RH conditions.
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