FREIGHT CAR DYNAMICS-DEMONSTRATION TEST & ANALYSIS VOLUME II-FORCED VIBRATION, DYNAMIC STRESS ANALYSIS AND FATIGUE LIFE PREDICTION

Free vibration characteristics of a rail flat car structure were investigated in Volume I using three different finite element models. These models were validated through the comparison of the predicted vibration mode shapes and frequencies with test results. Further validation of the models is performed here through comparison of the analytical transfer function with test results. The values of the transfer functions are computed, using NASTRAN, at five different locations along the center line of the flat car. Experimental values at these locations are found to be in good agreement with the computed results. A fatigue life evaluation of an arbitrarily selected member of the flat car is performed to demonstrate the application of finite-element structural dynamics analysis to fatigue life prediction. The fatigue life values obtained using this approach, are then compared with the so called ad hoc approach which uses a nominal stress value obtained from a pseudo-dynamic (augmented static) analysis.

Media Info

  • Features: Appendices; Figures; References; Tables;
  • Pagination: 69 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00189065
  • Record Type: Publication
  • Source Agency: Association of American Railroads
  • Report/Paper Numbers: AAR Rpt. R-322 Tech Rpt.
  • Files: TRIS
  • Created Date: May 11 1979 12:00AM