Finite element analysis of fatigue crack growth of linear friction welded superalloy joints

被引：0
|
作者：
Yang X. [1 ]
Peng C. [1 ]
Ma T. [1 ]
Wen G. [2 ]
Wang Y. [1 ]
Chai X. [1 ]
Xu Y. [1 ]
Li W. [1 ]
机构：
[1] State Key Laboratory of Solidification Processing, Shaanxi Key Laboratory of Friction Welding Technologies, School of Materials Science and Engineering, Northwestern Polytechnical University, Xi'an
[2] Xi'an Research Institute of China Coal Technology & Engineering Group Corp., Xi'an
来源：
Hangkong Xuebao/Acta Aeronautica et Astronautica Sinica | 2022年 / 43卷 / 02期
基金：
中国国家自然科学基金;
关键词：
Crack propagation; Finite element analysis; Joint; Microstructure; Residual tensile stress;
D O I：
10.7527/S1000-6893.2021.25004
中图分类号：
学科分类号：
摘要：
To characterize the fatigue crack initiation and growth of linear friction welded superalloy joints in the fatigue environment and reveal the effect of crack growth on joint failure, this study investigates the fatigue crack growth behavior of the linear friction welded superalloy joint and its important influencing factors based on the finite element method. To study the internal causes of joint failure (holes, hard inclusions, and residual stresses), finite element models for the fatigue joints containing initial holes and inclusions with different geometric and location characteristics were established to study the sequence of crack initiation and propagation of the joints and classify important factors of crack growth. The results show that for the fatigue joints with initial holes and inclusions, cracks were initiated at the locations of the holes and inclusions. For the specimens with initial inclusions, the cracks grew in a "bypass" manner. For the joints with initial holes, the cracks were all propagated in a "crossing" manner. The locations of holes and inclusions had little effect on the crack initiation position and propagation mode. Crack initiation, propagation and specimen fracture occurred earlier with the increase of the size of holes and inclusions. The residual tensile stress of the joint accelerates the initiation and propagation of cracks, and the initiation and propagation time of cracks is positively correlated with the tensile stress. © 2022, Beihang University Aerospace Knowledge Press. All right reserved.
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