Continuum Modeling of Engineering Constants of Oriented Strandboard

.4 tuo-d~nlen\io~l,lI motlel lo pretlict engineering const;lnts ot' o~.ic~jted strandhoard (OSB) was tievclopccl sing a continuum theory. The orthotropic flake properties, flahe alignment distrihution. ant1 panel \hclling !ratio (as measured by flake weight ratio, FWK, between face layer and entire board) l o r three-layer OSB werc considered in the model. The two-tcrm cosine prohability density function (PDF) provided an effective way to describe flake alignment distributions Ibr both single and three-layer OSB based on flake angle measurements from the panel top surt'i~cc. The par~uneters that define the PDF varied with percent alignment (PA) and FWR 'l'hc ~.ontin~lurn motlel. cornbincd with flake alignment PDFs, predicted general trends of change? in OSH'\ engineering constants including Young's moduli. shear n~odulus. Poisson ratio, and linear cupan\ion (LE) coefticient\. Thc predicted values Y o ~ ~ n g ' s moduli and LE along the two major directions compared well with experimental data for selected hoard structures. The three-dimensional mesh plot\ on vi lr io~~s propertie\ allow examining the trend of change of each property as a function of PA and FWR. which can bc used to optimize OSB's engineering performance. The c o n t i n ~ ~ u m odcl PI-()\ides a comprehensive analytical solution for the prediction of two-dimensional engineering constants of OSR, which is the basis for future modeling on OSB's void