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On the Fatigue Damage of GH4169 Based on Thermodynamic Entropy Generation
Shuiting Ding1, Liangliang Zuo2, Guo Li2,*, Zhenlei Li3, Shuyang Xia2, Shaochen Bao3
1 Civil Aviation University of China, 2898 Jinbei Road, Tianjin, 300300, China
2 School of Energy and Power Engineering, Beihang University, 37 Xueyuan Road, Beijing, 100191, China
3 Research Institude of Aero-Engine, Beihang University, 37 Xueyuan Road, Beijing, 100191, China
* Corresponding Author: Guo Li. Email:
The International Conference on Computational & Experimental Engineering and Sciences 2023, 25(1), 1-1. https://doi.org/ 10.32604/icces.2023.09911
Abstract
This paper presents the assessment of fatigue damage for GH4169 under cyclic loading based on
thermodynamic entropy generation at elevated temperature. According to the second law of
thermodynamics, fatigue crack propagation is an irreversible thermodynamic dissipative process in which
damage accumulates and entropy generates with each cycle until fracture occurs. In this work, crack growth
process is simulated by commercial finite element software ABAQUS, and the concept of cyclic entropy
generation rate (CEGR) is proposed to present the entropy generation of the crack tip region in a single
loading cycle, where the calculation of CEGR is dependent on the evolution data of stress, plastic strain rate
and temperature at the crack tip region. The accumulated entropy generation of crack growth process is
obtained by integrating CEGR. The influence of temperature and the amplitude of uniform far-field stress on
CEGR and accumulated entropy generation is discussed. Results indicated that the rise of temperature and
the increase of far-field stress amplitude can both increase the dissipation of plastic strain energy at crack
tip region, leading to the increase of CEGR eventually. When the temperature and the far-field stress
amplitude remain unchanged in fatigue progress, CEGR increases continuously until fracture occurs. Results
showed that the entropy generation per unit crack length ds/da is almost a constant in crack growth process.
The fatigue fracture entropy (accumulated entropy generation at fracture point) has an approximate
quadratic function relationship with the amplitude of uniform far-field stress. The fatigue damage is defined
as the ratio of accumulated entropy generation to fatigue fracture entropy in this paper, and an estimation
model for fatigue damage using the normalized cycles N/Nf is proposed. The estimated fatigue damage is
compared to literatures.
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Cite This Article
APA Style
Ding, S., Zuo, L., Li, G., Li, Z., Xia, S. et al. (2023). On the fatigue damage of gh4169 based on thermodynamic entropy generation. The International Conference on Computational & Experimental Engineering and Sciences, 25(1), 1-1. https://doi.org/ 10.32604/icces.2023.09911
Vancouver Style
Ding S, Zuo L, Li G, Li Z, Xia S, Bao S. On the fatigue damage of gh4169 based on thermodynamic entropy generation. Int Conf Comput Exp Eng Sciences . 2023;25(1):1-1 https://doi.org/ 10.32604/icces.2023.09911
IEEE Style
S. Ding, L. Zuo, G. Li, Z. Li, S. Xia, and S. Bao "On the Fatigue Damage of GH4169 Based on Thermodynamic Entropy Generation," Int. Conf. Comput. Exp. Eng. Sciences , vol. 25, no. 1, pp. 1-1. 2023. https://doi.org/ 10.32604/icces.2023.09911