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- Title
FAILURE ANALYSIS OF A DIESEL MAIN ENGINE'S VALVE STEMS.
- Authors
Nik Yusoff, Nik Hassanuddin; Nain, Hasril; Isa, Mahdi Che; Nor, Irwan Mohd
- Abstract
Several components of a Stork Wartsila 12V 28SW diesel main engine failed dramatically after 1,400 h of service. Upon inspection of the components, it was found that the valve stems of cylinder liner no. 2 were extremely damaged. Investigation of the valve stems was conducted through visual examination, chemical analysis and fractography. Various fracture mechanisms, such as fatigue fracture, ductile tensile overload and very high cycle fatigue (VHCF) were observed. It was determined that the damages sustained by the engine were a result of fatigue failure due to high usage of the valve stems. After long use and exposure to the high temperatures, the fatigue strength of the valve decreased and hence, fatigue failures of the materials occurred at stresses lower than the conventional fatigue limit.
- Subjects
FAILURE analysis; DIESEL motors; ENGINE valve manufacturing; ANALYTICAL chemistry; HIGH cycle fatigue
- Publication
Defence S&T Technical Bulletin, 2014, Vol 7, Issue 1, p27
- ISSN
1985-6571
- Publication type
Article