Fatigue failure of a helical gear in a gearbox

Asi O.

Engineering Failure Analysis, cilt.13, sa.7, ss.1116-1125, 2006 (SCI-Expanded, Scopus) identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 13 Sayı: 7
  • Basım Tarihi: 2006
  • Doi Numarası: 10.1016/j.engfailanal.2005.07.020
  • Dergi Adı: Engineering Failure Analysis
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.1116-1125
  • Anahtar Kelimeler: Fatigue, Helical gear, Misalignment, Pitting, Spalling
  • Uşak Üniversitesi Adresli: Hayır

Özet

This paper presents a failure analysis of a helical gear used in gearbox of a bus, which is made from AISI 8620 steel. The helical gear had been in service about three years when several teeth failed. The failed helical gear had a number of adjacent teeth and random teeth breakage at one end of teeth. An evaluation of the failed helical gear was undertaken to assess its integrity that included a visual examination, photo documentation, chemical analysis, micro-hardness measurement, and metallographic examination. The failure zones were examined with the help of a scanning electron microscope equipped with EDX facility. Results indicate that teeth of the helical gear failed by fatigue with a fatigue crack initiation from destructive pitting and spalling region at one end of tooth in the vicinity of the pitch line because of misalignment. © 2005 Elsevier Ltd. All rights reserved.