Finite element analysis of fatigue damage in passenger-car diesel engine cylinder head under cyclic thermo-mechanical loadings
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Abstract:
In this article, the thermo-mechanical fatigue lifetime of the cylinder head of a passenger-car diesel engine has been estimated. At the first stage, stress and strain distributions in the cylinder head have been calculated using the two-layer visco-plastic model, available in the ABAQUS software. The calibration of the model was performed, using correlating of simulated hysteresis curves and low-cycle fatigue (LCF) and thermo-mechanical fatigue (TMF) tests on the aluminum-silicon-magnesium alloy. In order to estimate the fatigue lifetime of the cylinder head, two common approaches including the corrected plastic strain energy model and the Sehitoglu’s model were utilized. Obtained results of both models showed that the fatigue crack area was located between valves, which could be verified by empirical observations of the fatigue crack area. Both models had similar results; however, the energy model was the optimal approach, in order to predict the fatigue lifetime of components, than that of the Sehitoglu’s model. The reason was simplified formulations and the lower number of material constants for the energy model, with respect to those of the Sehitoglu’s model.
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Journal title
volume 51 issue 51
pages 3- 20
publication date 2018-07
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