Skip to main content
U.S. flag

An official website of the United States government

26 results found
When dry wood is placed in water, the water not only fills the lumen (void in the cells) but also diffuses into the cell walls, causing them to expand. Although the wood becomes weaker via this cell wall plasticization, failure generally increases in the bondline rather than in the wood under wet…
Author(s): Charles R. Frihart
Keywords: Wood moisture, adhesion, adhesives, moisture content, testing, bondline, shrinkage, failure, failures in wood, swelling, strength, bond strength, durability, wood bonding, bonding
Source: Proceedings : 30th annual meeting of the Adhesion Society, Inc. : February 18-21, 2007, Tampa Bay, FL. [S.l. : s.n.], c2007: pages 222-224.
Year: 2007
Gypsum board is a common fire barrier used in house and general building construction. Recently, evaluation of the collapses of the World Trade Center Towers highlighted the potential role and failure of gypsum board in containing the fires and resisting damage. The use of gypsum board as primary…
Author(s): S.M. Cramer, O.M. Friday, R.H. White, G. Sriprutkiat
Keywords: Drywall, high temperature effects, wallboard, materials at high temperature, elasticity, fire resistant materials, gypsum board, mechanical properties, bending strength, shrinkage
Source: Fire and materials 2003 : 8th International Conference, January 2003, San Francisco, CA, USA. London : Interscience Communications Limited, c2003: pages 33-42.
Year: 2003
Evaluations of several mechanical and physical properties were conducted on specimens from five yagrumo hembra (Cecropia peltata) trees from Puerto Rico. With the exception of toughness and modulus of elasticity in both bending and compression parallel to grain, these specimens were lower in…
Author(s): B. A. Bendtsen
Keywords: Mechanical properties, physical properties, toughness, modulus of elasticity, bending, compression, specific gravity, strength, shrinkage, Puerto Rico, tangential shrinkage, Cecropia peltata, yagrumo hembra, radial shrinkage
Source: Research note FPL no. 053. Madison, WI : USDA Forest Service, Forest Products Laboratory. 7, [7] pages.
Year: 1964
Requests are frequently received by the Forest Products Laboratory to examine warped plywood, veneered table tops, or similar products, to explain the cause of the warping, and if possible to suggest measures to remedy the difficulty.
Keywords: Warping, veneers, plywood, swelling, shrinkage, stresses, cupping, twisting, crossbands
Source: Research note FPL no. 0136. Madison, WI : USDA, Forest Service, Forest Products Society. 8 pages.
Year: 1966
Minimizing wood shrinkage is a priority for many wood products in use, particularly engineered products manufactured to close tolerances, such as wood propellers for unmanned surveillance aircraft used in military operations. Those currently in service in the Middle East are experiencing…
Author(s): Richard Bergman, Robert J. Ross
Keywords: wood, propeller, shrinkage, sugar maple, veneer, equilibrium moisture content, EMC
Source: Research Note FPL-RN-0309. Madison, WI: U.S. Department of Agriculture, Forest Service, Forest Products Laboratory. 9 p.
Year: 2008
Stress-graded structural lumber is produced under two systems: visual grading and machine grading. Visual structural grading is the oldest stress grading system. It is based on the premise that the mechanical properties of lumber differ from those of clear wood because many growth characteristics…
Author(s): Roland Hernandez, David W. Green
Keywords: Grading, lumber, mechanical properties, wood, wood quality, wood density, shear, wood properties, strength, visual grading, knots, bending strength, tensile strength, compression parallel to grain, mechanical grading, softwoods, shrinkage
Source: Marks' standard handbook for mechanical engineers. New York ; London : McGraw-Hill, c2007: pages 6.121-6.127.
Year: 2007
Wood is a hygroscopic material which contains water in varying amounts, depending upon the relative humidity and temperature of the surrounding atmosphere. Equilibrium conditions are established as shown in Table 6.7.1. The standard reference condition for wood is oven-dry weight, which is…
Author(s): David W. Green, Robert White, Anton TenWolde, William Simpson, Joseph Murphy, Robert Ross
Keywords: Specific gravity, elasticity, wood drying, drying, mechanical properties, moisture, humidity, temperature, moisture content, strength, swelling, shrinkage, fiber-saturation point, green lumber, equilibrium moisture content, physical properties, hygroscopicity
Source: Marks' standard handbook for mechanical engineers. New York : McGraw Hill: ISBN: 0071428674: 9780071428675: pages 6.116-6.121.
Year: 2007
This report gives information on the edgewise modulus of elasticity, stiffness, and shrinkage of 360 joists in three species, three grades, and two sizes, each species obtained from two sources. Each joist was evaluated nondestructively at four moisture content values ranging from the green…
Author(s): Lyman W. Wood, Lawrence A. Soltis
Keywords: Green joists, dry joists, joists, stiffness, shrinkage, modulus of elasticity
Source: Res. Pap. FPL-RP-15. Madison, WI: U.S. Department of Agriculture, Forest Service, Forest Products Laboratory. 26 pages
Year: 1964
Among the most abundant of our undervalued hardwoods are the soft maples. However, other species that are also underutilized include some species of birch and some lower grades of the hard maples. This chapter covers physical, mechanical, and other important properties of different soft maples,…
Author(s): John I. Zerbe
Keywords: Hardwoods, moisture, specific gravity, mechanical properties, maple, yellow birch, modulus of elasticity, elasticity, maple, moisture content, shrinkage, compressive strength, shear strength, strength
Source: Undervalued hardwoods for engineered materials and components. Madison, WI : Forest Products Society ; Marquette, MI : Northern Initiative, [c2005]: Pages 15-19.
Year: 2005
Selected physical and mechanical properties of moso bamboo (Phyllostachys pubescens). Selected physical and mechanical properties of 4?6 year old moso bamboo (Phyllostachys pubescens) grown in Zhejiang, China were investigated at different vertical and horizontal positions. Two way analysis of…
Author(s): H.Q. Yu, Z.H. Jiang, C.Y. Hse, T.F. Shupe
Keywords: relative density, shrinkage, tensile modulus of elasticity, tensile strength
Source: Journal of Tropical Forest Science, Vol. 20(4): 258-263
Year: 2008