i. FEM results revealed that the first crankpin fillet is the most vulnerable point to fracture.
ii. Soderburg diagram of the studied crankshaft showed that the service operation point, which stands for mean and alternating stresses of the critical region (first crankpin fillet) was located in the safe region.
iii. SEM images of the fractured surface also showed cleavage fracture and put in evidence that the failure was brittle fracture
iv. The results suggest re-evaluation of the design and manufacturing.
v. Optimization of the fillet rolling process by changing process parameters has been recommended to the manufacturer. This recommendation has been adopted by the manufacturer and no further fracture has been reported since.