Fatigue Crack Propagation of Nickel-Based Superalloy: Experiments and Simulations with Extended Finite Element Method
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Fatigue Crack Propagation of Nickel-Based Superalloy: Experiments and Simulations with Extended Finite Element Method Hong Zhang
, Peidong Li, Qingyuan Wang, and Yongjie Liu
(Submitted February 13, 2018; in revised form September 17, 2018) Numerical simulation based on extended finite element method was employed to investigate the fatigue crack propagation of nickel-based superalloy at room temperature. Experimental tests on compact tension specimens have performed to obtain fatigue crack propagation parameters in Paris region. The extended finite element method has presented a new approach to solve the stress intensity factors and can effectively predict crack propagation without re-meshing at crack tip. The simulation results are in good accordance with experimental data in real 3D cases. Keywords
extended finite element method, fatigue crack propagation, nickel-based superalloy, stress intensity factor
the FCP model is empirical model and fitting by Paris and Erdogan (Ref 5) as following: da ¼ C ðDK Þm dN
1. Introduction Nickel-based superalloy strengthened by additions of titanium, aluminum, etc., are designed to meet high strength, toughness and thermal performance, and widely used in power generation, i.e., blades, rings and disks and nuclear boiler tube support (Ref 1), which are subjected to cyclic loading during service life. Fatigue crack propagation (FCP) starts as the result of cyclic loading which is typically below the yield stress of a material and finally lead to failure. Many investigators prove that FCP occurs over about 90% of the service life (Ref 2, 3). Hence, to address the fatigue failure behavior considered on crack initiation and propagation of nickel-based superalloy is very important for material design and safe application based on damage-tolerance criterion. It is well known that FCP model is described by a differential equation, which makes the FCP as a function of material properties and stress intensity factor (SIF) (Ref 4). And
Hong Zhang, Peidong Li, and Yongjie Liu, Failure Mechanics and Engineering Disaster Prevention and Mitigation Key Laboratory of Sichuan Province, College of Architecture and Environment, Sichuan University, Chengdu 610065, China; and Key Laboratory of Deep Underground Science and Engineering, Ministry of Education, Sichuan University, Chengdu 610065, China; Qingyuan Wang, Failure Mechanics and Engineering Disaster Prevention and Mitigation Key Laboratory of Sichuan Province, College of Architecture and Environment, Sichuan University, Chengdu 610065, China; Key Laboratory of Deep Underground Science and Engineering, Ministry of Education, Sichuan University, Chengdu 610065, China; State Key Laboratory of Hydraulics and Mountain River Engineering, Sichuan University, Chengdu 610065, China; and School of Architecture and Civil Engineering, Chengdu University, Chengdu 610106, China. Contact e-mails: [email protected] and [email protected].
Journal of Materials Engineering and Performance
ðEq 1Þ
where C
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