STRESSES IN THE RAILS, THE BALLAST AND IN THE FORMATION RESULTING FROM TRAFFIC LOADS. STRESS INCREMENTS IN RAILS DURING STARTING AND BRAKING

Item 1 (b) of the D 71 Work Programme covers the measurement of bending stresses at the rail foot, of the shear stress at the outer rail head surface, and of the longitudinal stress in the rail-web induced during accelerating and braking. The report discusses the measuring methods employed, including the determination of wheel loads at the rails. Separate measurements were made with two electric locomotives, one diesel locomotive, and one steam locomotive all with axle loads between 20 t and 21 t), and each of the runs was repeated with a goods train weighing 480 t. These measurements disclosed increases in the axle load of up to 17% during starting (accelerating), the maximum values being in good agreement with theoretical maximum values and of up to 11% during braking. These increases are most pronounced in the case of the four-wheeled bogie locomotives. The highest shear stresses measured during these investigations approached the values measured during high-speed tests.

• Supplemental Notes:
  • Restrictions on the use of this document are contained in the explanatory material.
• Corporate Authors:

  International Union of Railways

  Office of Research and Experiments
  Utrecht,   Netherlands 
• Publication Date: 1967-6

Media Info

• Features: Figures; Tables;
• Pagination: 17 p.

Subject/Index Terms

• TRT Terms: Acceleration (Mechanics); Axle load force; Bending; Bending stress; Braking; Car wheels (Railroads); Defects; Force; Railroad rails; Shear stress; Stresses; Tests; Wheel loads; Wheels
• Uncontrolled Terms: Contact stress
• Old TRIS Terms: Axle loadings; Question d71; Rail stress
• Subject Areas: Railroads; Vehicles and Equipment;

Filing Info

• Accession Number: 00052870
• Record Type: Publication
• Source Agency: International Union of Railways
• Report/Paper Numbers: D 71/RP 5/E
• Files: TRIS
• Created Date: Jun 5 1976 12:00AM