BROACHING HOLES IN RAILS

Anything that can be done to reduce bolt hole stresses will increase the fatigue life of rails. The perfect result is achieved by completely eliminating fishbolt holes. Four methods of improving fishbolt holes are: 1. careful drilling to produce holes of smooth fish; 2. radiusing the edges of the holes; 3. reducing the diameter of the holes; 4. work hardening the internal surface of the holes. Work hardening the hole is achieved by forcibly increasing its diameter after the initial drilling. The fatigue strength of the drilled rails is improved by at least 25 percent by work hardening.

• Corporate Authors:

  Temple Press Limited

  161-166 Fleet Street
  Longon EC4,   England 
• Publication Date: 1968-11-6

Media Info

• Features: Photos;
• Pagination: p. 892
• Serial:
  • RAILWAY GAZETTE
  • Volume: 124

Subject/Index Terms

• TRT Terms: Bolts; Concrete hardening; Defects; Failure; Fastenings; Fatigue (Mechanics); Fatigue (Physiological condition); Hardness; Holes; Rail joints; Railroad rails; Stresses; Technology; Tie bars
• Geographic Terms: United Kingdom
• Old TRIS Terms: Bolt holes; End breaks; Rail failure; Star cracks (Rails)
• Subject Areas: Railroads; Safety and Human Factors;

Filing Info

• Accession Number: 00037481
• Record Type: Publication
• Files: TRIS
• Created Date: Nov 24 1976 12:00AM