EFFECT OF TIEDOWNS ON WOOD BLOCKS USED AS DUNNAGE

A series of tests were conducted to determine the effect of chain, cable and webbing tiedown forces on the corners of spruce and maple dunnage blocks while under tension. The tests examined the effect of the degree of tension and shape of the tiedown on corner deformation and measured hysteresis effects of the dunnage and its ability to retain tension in the tiedown. The tests were conducted using tiedowns tensioned across the dunnage at three different angles. The maple hardwood displayed less deformation and splitting than the softer spruce. Both wood samples contributed to an abrupt loss of tension during unloading thereby displaying the mechanism of tiedown slackening during load shifting. At shallow tiedown wrap angles the tiedown tended to abrade the corner rather than indent it. Chain tended to splinter and crack the dunnage corners, wire rope tended to slice into the dunnage and webbing material tended to compress the surface without splintering or cracking. Recommendations are made regarding the use of dunnage with various tiedowns. (A)

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  • Corporate Authors:

    Canadian Council of Motor Transport Administrators

    2323 St. Laurent Boulevard
    Ottawa, Ontario  Canada  K1G 4J8
  • Authors:
    • MERCER, WRJ
  • Publication Date: 1998-10

Language

  • English

Media Info

Subject/Index Terms

Filing Info

  • Accession Number: 00765848
  • Record Type: Publication
  • Source Agency: Transportation Association of Canada (TAC)
  • ISBN: 0-921795-42-4
  • Files: ITRD
  • Created Date: Jul 1 1999 12:00AM