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16 feet AIRPLANE WING BEAMS axis BEAMS SUBJECTED Birch box beams Bureau of Aeronautics calculating cent Pounds CHARLES G clear distance COMMITTEE FOR AERONAUTICS compression parallel DATA FROM UNPUBLISHED DESIGN OF PLYWOOD design stress diaphragm spacing distance between flanges elastic limit face grain failure by shear fiber stress filler blocks FOREST PRODUCTS LABORATORY GEORGE W glue area glue line glued Inches Inches Inches Inches Pounds longitudinal Maxi Maximum shear stress modulus of elasticity moment of inertia NATIONAL ADVISORY COMMITTEE parallel to grain Perpendic plywood webs pounds per square Pounds Pounds PRODUCTS LABORATORY REPORT Q one-half REPORT NATIONAL ADVISORY secondary stresses Shear in webs shear stress shearing modulus side load Sitka spruce slide rule Specific gravity square inch stress at elastic stress in shear symmetrically applied TRANSVERSE LOADING TRAYER UNPUBLISHED FOREST PRODUCTS Vertical WEBS FOR AIRPLANE Weight Load Width Depth Depth wood Yellow poplar yellow poplar plywood
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Halaman 1 - ... species follow: Spruce . . ....................... 1,000 pounds per square inch Yellow poplar ................... 1,070 pounds per square inch True mahogany ................. 1,150 pounds per square inch Birch .......................... 1,735 pounds per square inch For a diaphragm spacing from 1J^ to 2J^ times the clear distance between flanges, use five-thirds of the design stress in shear recommended for the species. Some actual values follow: Spruce ......................... 1,250 pounds per...
Halaman 2 - ... given in the table for computing the resistance of beams to longitudinal shear. On the basis of 3 seconds duration of stress, the fiber stress at elastic limit in torsion may be taken as two-thirds of the shearing stress at maximum torsional load for any species. The mean modulus of rigidity of spruce is equal to the modulus of elasticity along the grain divided by 15.5, or 84,000 lb.
Halaman 2 - First, the gram of the plywood is not parallel to the grain of the flanges and therefore the bond between the two as far as shear is concerned is no greater than that between successive plies of plywood, which is about one-half of that for glued construction in which the grain of the different pieces is all...
Halaman 3 - In Charge of Section of Timber Mechanics, Forest Products Laboratory, Forest Service, United States Department of Agriculture, Madison, Wis.; Member, American Society for Testing Materials; American Society of Civil Engineers.
Halaman 1 - ... inches). When no diaphragms are used or when the diaphragm spacing exceeds three times the clear distance between flanges, use four-thirds of the design stress in shear recommended for the species. (Table VIII.) The actual values for four species follow : Spruce: 1,000 pounds per square inch.
Halaman 2 - Plywood. Allowable shear stresses for plywood webs so constructed that the plies are alternately parallel and perpendicular to the length of the beam should not exceed 87^ per cent of those recommended for 45-deg.