Multiaxial fatigue life prediction for notched specimens considering stress gradient effect

doi:10.13245/j.hust.210315

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	Multiaxial fatigue life prediction for notched specimens considering stress gradient effect
	Liu, Jianhui; Pan, Xuemei; Hua, Feilong; Dai, Baolin
刊名	Huazhong Keji Daxue Xuebao (Ziran Kexue Ban)/Journal of Huazhong University of Science and Technology (Natural Science Edition)
	2021-03-23
卷号	49 期号:3 页码:80-85
关键词	Crack propagation Distribution functions Linear transformations Strain energy Welds Co-ordinate transformation Crack initiation and propagation Equivalent stress distribution Finite element software Multiaxial fatigue life Multiaxial proportional loading Strain energy density Stress gradient effects
ISSN号	1671-4512
DOI	10.13245/j.hust.210315
英文摘要	The field intensity of the fatigue damage area near the notch was taken as the damage parameter, and a method for predicting the fatigue life of notched specimens under multiaxial proportional loading was proposed by combining the Manson-Coffin equation. Firstly, the plane with the highest strain energy density was defined as the critical plane position by using coordinate transformation matrix. The proposed method overcomes the shortcoming of the traditional energy method which is difficult to describe the direction of crack initiation and propagation. Secondly, the equivalent stress of critical plane distribution rule was analyzed by using the finite element software and the equivalent stress distribution function within 5 mm from the danger point was fitted. The size of the fatigue damage affected area was determined by calculating the stagnation point of the relative stress gradient function. The field intensity of the fatigue damage affected area was used as the damage parameter to estimate the fatigue life of Q345 steel multiaxial notched specimens. Finally, the estimated life using the proposed method and the local stress strain method were compared with the test life. The results show that both the estimated life has error within the factor of 2 with the corresponding experimental value. But for considering the stress gradient effect in the proposed method, the estimated accuracy is better than that of the local stress strain method. © 2021, Editorial Board of Journal of Huazhong University of Science and Technology. All right reserved.
语种	中文
出版者	Huazhong University of Science and Technology
内容类型	期刊论文
源URL	[http://ir.lut.edu.cn/handle/2XXMBERH/148412]
专题	机电工程学院
作者单位	School of Mechanical and Electronical Engineering, Lanzhou University of Technology, Lanzhou; 730050, China
推荐引用方式 GB/T 7714	Liu, Jianhui,Pan, Xuemei,Hua, Feilong,et al. Multiaxial fatigue life prediction for notched specimens considering stress gradient effect[J]. Huazhong Keji Daxue Xuebao (Ziran Kexue Ban)/Journal of Huazhong University of Science and Technology (Natural Science Edition),2021,49(3):80-85.
APA	Liu, Jianhui,Pan, Xuemei,Hua, Feilong,&Dai, Baolin.(2021).Multiaxial fatigue life prediction for notched specimens considering stress gradient effect.Huazhong Keji Daxue Xuebao (Ziran Kexue Ban)/Journal of Huazhong University of Science and Technology (Natural Science Edition),49(3),80-85.
MLA	Liu, Jianhui,et al."Multiaxial fatigue life prediction for notched specimens considering stress gradient effect".Huazhong Keji Daxue Xuebao (Ziran Kexue Ban)/Journal of Huazhong University of Science and Technology (Natural Science Edition) 49.3(2021):80-85.