Abstract
It is rather difficult for engineers to apply many of the fatigue damage models for requiring a knee point, material-dependent coefficient, or extensive testing, and some of them are only validated by a fatigue test of two-stage loading rather than higher-stage loading. In this paper, we propose a new model of fatigue cumulative damage in variable amplitude loading, which just requires the information of the S-N curve determined from the fatigue experiment. Specifically, the proposed model defines a stress equivalent transformation way to translate the damage of one stress to another stress through simple calculation. Experimental data of fatigue including two-, three-, and four-block loading verify the superiority of the proposed model by comparing it with the Miner model and Manson model. The results show that the proposed model can be generalized to any type of loading and presents a better prediction. Therefore, the advantage of the proposed model can be easily used by an engineer.
Highlights
Fatigue fracture plays an important role in the failure of mechanical components, which accounts for 80%–90% of the failure probability [1]
Shang et al [8] proposed a new nonlinear model of fatigue cumulative damage based on the evolution law of the material ductility during fatigue damage
Despite extensive works on this area, many of these models require a knee point, material-dependent coefficient, or extensive testing, and some of them are only validated by a fatigue test of two-stage loading rather than higher-stage loading
Summary
Fatigue fracture plays an important role in the failure of mechanical components, which accounts for 80%–90% of the failure probability [1]. Subramanyan [6] and Hashin et al [7] proposed the power law rule by considering a knee point in the S-N curve to predict the remaining damage, which needs the endurance limit of material. Shang et al [8] proposed a new nonlinear model of fatigue cumulative damage based on the evolution law of the material ductility during fatigue damage. Djebli et al [12] proposed a nonlinear fatigue damage accumulation model relying on the application of energy parameters. Considering the above-mentioned situation, the present work aims to apply a new fatigue damage model in a simple way under variable amplitude loading. E proposed model relies only on the S-N curve and does not need other fixed points or other material parameters, while being applicable for fatigue analysis engineers.
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