Rate- and duration-of-load behavior of lab-made structural flakeboards
U.S. Dept. of Agriculture, Forest Service, Forest Products Laboratory, 1985 - Particle board - 8 pages
Tests of structural use panels under different loading conditions provide basic information for establishing design stresses. This paper reports the effects of loading rate in tension and bending and of duration of load in tension on the properties of four lab-made structural flakeboards, (two of which had aligned flakes). The objective was to determine if these panels-made from larger, engineered flakes-behaved the same as commercial particleboards-made primarily from planer shavings and sawdust-that were evaluated in an earlier study. For specimens loaded to failure at different rates of deformation, strength decreased 12 pct in tension and 8 pct in bending with each tenfold increase in time to maximum load. Modulus of elasticity decreased 4 to 5 pct. For specimens loaded in tension at constant stress levels from 50 to 90 pct of static strength, time to failure increased tenfold with each 8 pct decrease in stress. These results for the lab-made structural flakeboards are essentially the same as those reported earlier for commercial particleboards. Keywords: Flakeboard, stress-rupture, particleboard, rate of loading, duration of load, tension, bending. (Author).
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1-in ring 11 were cut 2-in disk flakes ALlGNED ASTM bending modulus Bending specimens board type 11 commercial particleboards constant stress levels control specimens data was calculated dependent variable Duration of Load duration-of-load earlier study McNatt elasticity MOET face flakes face material flake alignment four lab-made independent variable lab-made flakeboard lab-made structural flakeboards Lehmann load tests load till failure loaded to failure loading conditions loading on tension log10 TF logarithmic scale material in board maximum load Modulus Modulus modulus of elasticity modulus of rupture MOEB and MOET MOR decreased number of specimens panel parallel Parallel Perpendicular parallel to flake parallel to surface percent perpendicular to flake plotted in figure rate of loading regression equation regression line ring flakes Solid symbols Specimens for board Specimens were loaded stress in tension study Geimer study McNatt 1975 support post symbols are controls table tensile strength decreased tension parallel tension specimens