Investigations on fatigue fracture of steel components for automobile applications have conducted for many decades to ensure the performance at a high level in its service life. In this paper, failure analysis and optimization design for fatigue fracture of low carbon steel bracket fixing oil inlet pipe to automotive engine have experimentally achieved via optical microscopy (OM), spectrometry and scanning electron microscopy (SEM) together with energy dispersive spectrometry (EDS). Therefore, the fracture mechanism and root cause have been determined according to the research results of fracture morphology, microstructure and chemical composition. During the certain platform test the fatigue crack has initiated at the root of fold-typed surface defects of U-typed notch near the bending section resulting from remarkable tendency of stress concentration. The small crack propagates driven by the periodic vibration stress and leads to a final fracture failure. Service performance of the bracket has been improved by optimizing the structural design and controlling the machined surface quality, and the earlier fatigue failure can be consequently avoided.
Fatigue Fracture and Optimization Design of Low Carbon Steel Bracket for Automotive Engine Application
Lect. Notes Electrical Eng.
2022-01-13
10 pages
Aufsatz/Kapitel (Buch)
Elektronische Ressource
Englisch
Topologic Optimization Applied to an Auxiliary Organs Bracket of an Automotive Engine
SAE Technical Papers | 2008
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