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Monday, May 18, 2020 | History

1 edition of Gripped-end effect in tension proof testing of dimension lumber found in the catalog.

Gripped-end effect in tension proof testing of dimension lumber

Gripped-end effect in tension proof testing of dimension lumber

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Published by U.S. Dept. of Agriculture, Forest Service, Forest Products Laboratory in Madison, WI .
Written in English

    Subjects:
  • Lumber -- Testing,
  • Strength of materials,
  • Strains and stresses

  • Edition Notes

    Other titlesGripped end effect in tension proof testing of dimension lumber
    StatementAngela M. Terry ... [et al.]
    SeriesResearch paper FPL-RP -- 496, Research paper FPL -- 496
    ContributionsTerry, Angela M. 1963-, Forest Products Laboratory (U.S.)
    The Physical Object
    Pagination13 p. :
    Number of Pages13
    ID Numbers
    Open LibraryOL17929709M


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Gripped-end effect in tension proof testing of dimension lumber Download PDF EPUB FB2

Additional Physical Format: Online version: Gripped-end effect in tension proof testing of dimension lumber. Madison, WI: U.S. Dept. of Agriculture, Forest Service, Forest Products Laboratory, [].

CiteSeerX - Document Details (Isaac Councill, Lee Giles, Pradeep Teregowda): Abstract Contents The objectives of this study were (1) to predict falldown of gripped-end lumber using a computersimulated tension strength-length effect model and (2) to measure the effectiveness of tension proof testing.

load. The results confirm that gripping lumber ends in the tension proof test prevents failure of some pieces of lumber with tension strength below the proof load level. This general problem is referred to as the gripped-end effect. Although the computer model predicted falldown at a low proof load level, it failed.

the gripped ends ofthe lumber do not fully experience the proof stress during a tension prooftest. First the middle portion of each foot 2X6 No. 2 KDl5 Southern Pine lumber specimen was tension prooftested, as ifthe pieces were only 10 feet long. Abstract Contents The objectives of this study were (1) to predict falldown of gripped-end lumber using a computersimulated tension strength-length effect model and (2) to measure the effectiveness of tension proof testin.

Gripped-End Effect in Tension Proof Testing of Dimension Lumber. A FPL - RP - Moisture Content and Tensile Strength of Douglas Fir Dimension Lumber. A FPL - RP - Effects of Fire Retardant Chemicals on the Bending Properties of Wood at Elevated Temperatures.

A FPL - RP. Our results show that the combined incising-preservative effect on mean property values for lumber incised in the dry condition prior to treatment was in the range of a 0 to 10% loss in modulus of elasticity, 15% to 25% loss in modulus of rupture, and.

damaging aspect of knots in sawn lumber is that the continu-ity of the grain around the knot is interrupted by the sawing process. In general, knots have a greater effect on strength in tension than compression; in bending, the effect depends on whether a knot is in the tension or compression side of a beam (knotsFile Size: KB.

ASTM's wood standards are instrumental in the evaluation and testing of the physical and chemical properties of a wide range of wood and wood-based products. Wooden materials covered here include timber, lumber, wood-base fibers, commercial softwoods and hardwoods, wood preservatives, laminated timber, and composite lumber to name a few.

Defects in lumber are faults that detract from the appearance and utility of the wood. Some are present when the wood is produced and others develop or become more severe as the wood ages. As a general rule, you can reduce the amount of defects by purchasing higher-grade materials at the outset.

Tensile testing of metallic materials is specified according to European EN standard. In this article the terms, definitions and designation for tensile test made at ambient temperature is described.

The test involves straining a test piece in tension, generally to fracture, for the purpose of determining mechanical properties. The end pressure ranged from MPa ( psi) to MPa ( psi) and was applied for 20 seconds. The finger-joined lumber was crosscut at m (8 ft.) to obtain specimens for tension tests.

The speciments for the end pressure effect were mechanically. uniaxial tension using the Instron Model The samples were dog-bone structures to localize the point of failure to the center of the samples during testing (Fig.

The initial sample dimensions (width and thickness) were measured, and then the samples were mounted into the fixed lower base of the Instron (TableFig. The relationship of tensile strength to bending strength for the test sample of dimension lumber was readily validated as similar to that for temperate softwoods from the United States and Canada.

The Lumbar Spine, The Cervical Spine And the Knee Testing and Rehabilitation Arthur Jones produced by the effect of gravity on the mass of the involved body parts, by stored energy, and by muscular clear proof of valid test results.

For a period of several years, this was the most extreme. Quality Auditing Institute Listing Book Chicago Flameproof and Wood Specialties Corp. Listing Page Page 3 of 4 Lumber Ratings: The following outlines FlameTech™ Pressure Treated Lumber product ratings: Table 3: Surface Burning Characteristics per ASTM E84 (Extended) / ASTM E NOMINAL DIMENSIONS SPECIES Flame Spread Index (FSI) Smoke.

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