Multiaxial fatigue life prediction for notched specimens considering stress gradient effect

doi:10.13245/j.hust.210315

IR > 机电工程学院

	Multiaxial fatigue life prediction for notched specimens considering stress gradient effect
	Liu JH(刘俭辉); Pan XM(潘雪梅); Hua FL(华飞龙); Dai BL(戴宝林)
	2021-03-23
发表期刊	Huazhong Keji Daxue Xuebao (Ziran Kexue Ban)/Journal of Huazhong University of Science and Technology (Natural Science Edition)
ISSN	1671-4512
卷号	49 期号:3 页码:80-85
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.
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
DOI	10.13245/j.hust.210315
收录类别	EI
语种	中文
出版者	Huazhong University of Science and Technology
EI入藏号	20211710250622
EI主题词	Fatigue damage
EI分类号	538.2 Welding ; 921.3 Mathematical Transformations ; 922.1 Probability Theory ; 931.1 Mechanics ; 951 Materials Science
引用统计	无
文献类型	期刊论文
条目标识符	https://ir.lut.edu.cn/handle/2XXMBERH/148412
专题	机电工程学院
作者单位	兰州理工大学机电工程学院
第一作者单位	机电工程学院
第一作者的第一单位	机电工程学院
推荐引用方式 GB/T 7714	Liu JH,Pan XM,Hua FL,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	刘俭辉,潘雪梅,华飞龙,&戴宝林.(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	刘俭辉,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.