Microstructure and fatigue fracture mechanism for a heavy-duty truck diesel engine crankshaft

Abstract

The main goal of this research is the experimental and numerical study of the fatigue function and failure of the crankshaft of the diesel engine of a heavy truck. To this end, a crankshaft of the diesel engine of a heavy truck that underwent failure after traveling 955000 km was used. The crack developed from the third crankpin, leading to nal failure in the llet of the 4th crankpin. To investigate the roots of this failure, several experimental studies were carried out. Besides, by using a three-dimensional nite element method, the location of the maximum stress in the crankshaft was determined using \complete crankshaft model" and \one-crank model". The application of the results of stress analysis was the basis for the crack growth model and fatigue life estimation to determine the stress intensity factor and fatigue life considering the related parameters and boundary conditions. At the nal stage, by using the results obtained from the given model for the fatigue crack growth, comparing them with experimental results, and examining the whole process, it was concluded that the scratches in crankpin region were the main reason for the fatigue failure obtained from the bending-torsional load-combination.

RETRACTED: Reliability analysis of fatigue crack growth for rail steel under variable amplitude service loading conditions and wear

“…The Paris law is used to describe the fatigue crack growth behavior and to predict the fatigue life under cyclic loading to failure in accordance with Eq. ( 3) [47][48][49][50][51]:…”

Failure analysis of four-cylinder diesel engine crankshaft

“…10 Micrographs of the second crankpin obtained from the left crack propagation for × 1000 magnifications Fig. 11 Stress distribution of von Mises in crankpin [11] 95,000 km of operation of four-cylinder light-duty truck diesel engine was conducted, and the following results were drawn.…”

“…The morphology of fracture surface showed that the fracture is of the smooth type and has occurred due to the fatigue. Aliakbari et al [11] have carried out another research on examining microstructure and fatigue fracture mechanism for a heavy-duty truck diesel engine crankshaft. The crankshaft started failure having travelled 955,000 km in the third crankpin.…”

Active Tilt Control of Brake Disc Bolt Load for Heavy Semitrailer

“…Additional vertical acceleration is produced by dynamic and impact, and centrifugal force is produced when wheel axle drives brake disc to rotate at high speed. The combined action of the two forces will cause dynamic stress and cyclic alternating stress of brake disc [10]. Therefore, the mechanism of bolt load damage in brake disc from the aspect of braking will be analyzed.…”