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ACTA AERONAUTICAET ASTRONAUTICA SINICA ›› 2023, Vol. 44 ›› Issue (10): 427300-427300.doi: 10.7527/S1000-6893.2022.27300

• Material Engineering and Mechanical Manufacturing • Previous Articles    

A unified criterion for high⁃low cycle fatigue life prediction based on crystal plasticity theory

Xiurui WANG1, Kaishang LI1, Hanghang GU1, Yong ZHANG1, Tiwen LU1, Runzi WANG2, Xiancheng ZHANG1()   

  1. 1.Key Laboratory of Pressure Systems and Safety,Ministry of Education,East China University of Science and Technology,Shanghai  200237,China
    2.Fracture and Reliability Research Institute,Graduate School of Engineering,Tohoku University,Sendai 9808579,Japan
  • Received:2022-04-19 Revised:2022-05-05 Accepted:2022-06-20 Online:2022-06-29 Published:2022-06-27
  • Contact: Xiancheng ZHANG E-mail:xczhang@ecust.edu.cn
  • Supported by:
    National Natural Science Foundation of China(52005185)

Abstract:

A life prediction unified criterion is developed for Inconel 718 (IN718) from Low Cycle Fatigue (LCF) to High Cycle Fatigue (HCF) within the crystal plasticity finite element framework. On the mesoscopic scale, the life prediction is completed with the help of Fatigue Indicator Parameter (FIP). For example, the LCF life is predicted well based on the FIP accumulated energy dissipation for IN718, while the predicted HCF life is too non-conservative, which will make the engineering components face the risk of advanced fatigue failure. Therefore, a new FIP, effective energy, is developed by the combination of effective elastic energy and accumulated energy dissipation. The critical value of effective energy is assumed to be a loading-condition-independent constant. When the effective energy per cycle is added up to the critical value, the fatigue life of the material can be determined. Not only the LCF life of IN718 but also the HCF life of IN718 is predicted well based on effective energy. However, results show that the critical values of effective energy for different strain amplitudes are not equal. And there is a double logarithmic linear relationship between the critical values of effective energy and effective energy per cycle under different strain amplitudes. Based on this, the life prediction criterion based on effective energy is modified. Results show that the modified life prediction criterion not only has higher life prediction accuracy but also has better life prediction stability for LCF and HCF life.

Key words: crystal plasticity, finite element, fatigue indicator parameter, life prediction, unified criterion

CLC Number: