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STRESS-CONCENTRATION IN THE JOINTS OF BUS FRAMES

In Hungary, the bus frames are built up from thin-walled, rectangular mild steel tubes, which are jointed by welding. In the joints of bus frame, 3 or 6 (sometimes more) tubes are set up forming sophisticated geometrical configurations. Service experiences show that the fatigue fracture of bus frames generally are initiated by the stress concentration in the joints. In the computer stress and strength analysis of bus frames only the nominal stresses can be determined in the lattice rods and an other step of the calculation is to analyse the stress concentration in the joints. A wide-range test program has been carried out to examine the stress distributions in the joints of thin-walled rectangular tubes, to determine the stress concentrations. For this purpose we are trying to use the Finite Element Method (FEM) in computer calculations; we are measuring the stress distributions by strain-gauges and comparing these results to the calculations and also fatigue tests are going on with the basic material, welded plates as well as welded joints. The stress concentration also can be defined on the basis of fatigue strength results.

  • Supplemental Notes:
    • Twentieth FISITA Congress, (SAE P-143), The Automotive Future, Volume 4, Austria, 6-11 May 1984.
  • Corporate Authors:

    Society of Automotive Engineers (SAE)

    400 Commonwealth Drive
    Warrendale, PA  United States  15096
  • Authors:
    • MATOLCSY, M
  • Publication Date: 1984-5

Media Info

Subject/Index Terms

Filing Info

  • Accession Number: 00392577
  • Record Type: Publication
  • Source Agency: National Highway Traffic Safety Administration
  • Report/Paper Numbers: SAE 845121, HS-037 474
  • Files: HSL, USDOT
  • Created Date: Feb 28 1985 12:00AM