Effect of Moisture on Bending and Breaking Resistance of Commercial Oriented Strandboards
Keywords:Design, flakeboard, stiffness, strength, thickness swelling
AbstractThis is a short addendum to an earlier paper (Wu and Suchsland 1997) on bending resistance (E·I) and breaking resistance (R·S) of commercial oriented strandboard (OSB). It is shown that for a moisture content (MC) change from 4 to 24%, the combined effect of increased MC and thickness swelling led to an average E·I loss of 37% in the parallel direction and 51% in the perpendicular direction; and to an average R·S loss of 31% in the parallel direction and 43% in the perpendicular direction. Predictive equations expressing E·I and R·S as functions of moisture content were established for various products.
Knudson, R. M. 1997. Moisture effect on properties of OSB. Personal communication.nSAS Institute Inc. 1994. SAS/STAT User's guide. Version 6. SAS Institute Inc., Cary, NC. 1688 pp.nWu, Q., and O. Suchsland. 1997. Effect of moisture on the flexural properties of commercial oriented strand boards. Wood Fiber Sci. 29(1):47-57.n
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