Mechanism-based thermomechanical fatigue life prediction of cast iron. Part II: Comparison of model predictions with experiments
In the present paper, predictions of mechanism-based models for cast iron are compared to experimental results obtained for the nodular cast iron EN-GJS-700, the vermicular cast iron EN-GJV-450 and the lamellar cast iron EN-GJL-250. A strategy is proposed to efficiently identify the model parameters based on isothermal experiments. In particular, complex low cycle fatigue (LCF) tests, tension tests and compression tests are used to adjust the time and temperature dependent cyclic plasticity model. The time and temperature dependent fatigue life prediction model is adjusted to LCF tests. For all investigated cast iron materials, good predictions of thermomechanical fatigue (TMF) tests are possible with the models. Additionally, the location of failure and fatigue life of a thermomechanically loaded double-sided notched specimen are predicted with high accuracy.