Practical Failure Analysis

, Volume 3, Issue 5, pp 69–72 | Cite as

Investigation of a mounting bolt failure in an automobile air brake assembly

  • N. Krishnaraj
  • P. Bala Srinivasan
  • V. Muthupandi
Peer Reviewed Articles

Abstract

The premature fatigue failure of a mounting bolt in an air brake assembly was traced to non-adherence to the established design. The heat input from a projection weld coupled with a sharp neck radius of curvature, and the proximity of the projection weld to the bolt neck combined with a higher-than-anticipated carbon content to produce acicular martensite in a region of high stress concentration. This combination of conditions increased the susceptibility to fatigue and caused the failure.

Keywords

fatigue hardness HAZ martensite mounting bolt projecting welding 

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Copyright information

© ASM International - The Materials Information Society 2003

Authors and Affiliations

  • N. Krishnaraj
    • 1
  • P. Bala Srinivasan
    • 2
  • V. Muthupandi
    • 2
  1. 1.ChennaiIndia
  2. 2.Department of Metallurgical EngineeringRegional Engineering CollegeTiruchirappalliIndia

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