TY - GEN
T1 - Cyclic Entropy Generation Rate to Signify the Fatigue Failure in Elevated-Temperature Crack Propagation of GH4169 Superalloy
AU - Zuo, Liangliang
AU - Ding, Shuiting
AU - Li, Guo
AU - Li, Zhenlei
AU - Bao, Shaochen
AU - Li, Bolin
N1 - Publisher Copyright:
© The Author(s), under exclusive license to Springer Nature Switzerland AG 2024.
PY - 2024
Y1 - 2024
N2 - Thermodynamic entropy is a natural metric of irreversible material damage in fatigue process. The cyclic entropy generation rate is utilized to characterize the system state of crack propagation specimen, and is investigated as the indicator of fatigue failure in crack propagation of GH4169 superalloy at elevated temperature. The crack propagation process is analyzed within the thermodynamic framework, and a procedure is proposed to calculate the cyclic entropy generation rate. Finite element simulations were conducted to obtained the data of fatigue life, crack length and cyclic entropy generation rate under different temperatures and different stress amplitudes. The results show that the cyclic entropy generation rate at fatigue failure first decreases and then increases with the increase of stress amplitude. The increasing trend of cyclic entropy generation rate with crack length can be divided into two stages. The cyclic entropy generation rate increases in an approximately exponential form during the second stage. The increase in temperature will significantly increase the cyclic entropy generation rate. The fatigue failure is about to occur when the cyclic entropy generation rate exceeds 1 × 104 J/(m3·K·cycle) for GH4169 superalloy, and this criterion is validated by specimens in other shape, such as compact tension specimens.
AB - Thermodynamic entropy is a natural metric of irreversible material damage in fatigue process. The cyclic entropy generation rate is utilized to characterize the system state of crack propagation specimen, and is investigated as the indicator of fatigue failure in crack propagation of GH4169 superalloy at elevated temperature. The crack propagation process is analyzed within the thermodynamic framework, and a procedure is proposed to calculate the cyclic entropy generation rate. Finite element simulations were conducted to obtained the data of fatigue life, crack length and cyclic entropy generation rate under different temperatures and different stress amplitudes. The results show that the cyclic entropy generation rate at fatigue failure first decreases and then increases with the increase of stress amplitude. The increasing trend of cyclic entropy generation rate with crack length can be divided into two stages. The cyclic entropy generation rate increases in an approximately exponential form during the second stage. The increase in temperature will significantly increase the cyclic entropy generation rate. The fatigue failure is about to occur when the cyclic entropy generation rate exceeds 1 × 104 J/(m3·K·cycle) for GH4169 superalloy, and this criterion is validated by specimens in other shape, such as compact tension specimens.
KW - Crack Propagation
KW - Cyclic Entropy Generation Rate
KW - Elevated Temperature
KW - Fatigue Failure
KW - GH4169 Superalloy
KW - Thermodynamic Entropy
UR - https://www.scopus.com/pages/publications/85202617129
U2 - 10.1007/978-3-031-68775-4_18
DO - 10.1007/978-3-031-68775-4_18
M3 - 会议稿件
AN - SCOPUS:85202617129
SN - 9783031687747
T3 - Mechanisms and Machine Science
SP - 240
EP - 258
BT - Computational and Experimental Simulations in Engineering - Proceedings of ICCES 2024—Volume 1
A2 - Zhou, Kun
PB - Springer Science and Business Media B.V.
T2 - 30th International Conference on Computational and Experimental Engineering and Sciences, ICCES 2024
Y2 - 3 August 2024 through 6 August 2024
ER -