Fracture Analysis of a Crankshaft Used for Heavy-Duty Truck

Chang Zhen Liu; Yong Gang Hao; Xiao Fei Chen; Xu Dong Li

doi:10.4028/www.scientific.net/AMM.654.61

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HomeApplied Mechanics and MaterialsApplied Mechanics and Materials Vol. 654Fracture Analysis of a Crankshaft Used for...

Fracture Analysis of a Crankshaft Used for Heavy-Duty Truck

Abstract:

A failure investigation for a diesel engine crankshaft has been conducted which was used for truck in this paper, which is made from 42CrMo steel. The fracture occurred on the crank web between the 4th crankpin and the 4th journal, the fracture section indicates that fatigue is the dominant mechanism. The dimensions, chemical compositions of material and surface hardness were evaluated in order to find the failure causes. Chemical compositions, the depth of hardness layer and surface hardness are qualified; however, there are transition zone of hardness layer on the journal boss fillet, the dimensions of journal boss is not qualified, it less than specified dimension, and many non-metallic inclusions aggregate zones and heavy segregation were found from metallographic photo, these would reduce the tensile strength. FEA analysis is also used to analysis the strength of this crankshaft, and the results suggest that the dimension of journal boss fillet is the key dimension, which has an important effect on the strength of the crankshaft. So the disqualified machining dimensions, material property are the main reasons for the fraction of this crankshaft.

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Periodical:

Applied Mechanics and Materials (Volume 654)

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61-64

DOI:

https://doi.org/10.4028/www.scientific.net/AMM.654.61

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Online since:

October 2014

Authors:

Chang Zhen Liu*, Yong Gang Hao, Xiao Fei Chen, Xu Dong Li

Keywords:

Crankshaft Facture, Experimental Analysis, FEA Simulation

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* - Corresponding Author

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