TY - JOUR
T1 - 3D constraint effect on 3D fatigue crack propagation
AU - Shen, Haijun
AU - Guo, Wanlin
PY - 2005/6
Y1 - 2005/6
N2 - As typical examples, tensile round bars with elliptical surface cracks are used to illustrate the three-dimensional (3D) constraint effect and the characteristics of 3D fatigue crack propagation. Based on the latest plastic constraint theory and the concept of equivalent thickness Beq, a practical 3D crack closure model, which can be as well used to obtain material da/dN-ΔKeff curves, is developed to eliminate the 3D constraint effect on 3D fatigue crack propagation. Further, in order to verify the present Beq based 3D crack closure model, the fatigue crack propagation lives of 20CrMo steel round bars with elliptical surface cracks and 7475-T761 aluminum alloy sheets with corner cracks in edge region of their holes are predicted in this paper. The analytical results based on the present 3D model show that the 3D constraint effect on 3D fatigue crack growth can be eliminated, and fatigue crack propagation lives for both 20CrMo steel round bars and 7475-T761 aluminum alloy sheets with straight holes can be predicted accurately. The Beq based 3D crack closure model in the present paper can also be applied to analyze other complicated 3D fatigue cracks.
AB - As typical examples, tensile round bars with elliptical surface cracks are used to illustrate the three-dimensional (3D) constraint effect and the characteristics of 3D fatigue crack propagation. Based on the latest plastic constraint theory and the concept of equivalent thickness Beq, a practical 3D crack closure model, which can be as well used to obtain material da/dN-ΔKeff curves, is developed to eliminate the 3D constraint effect on 3D fatigue crack propagation. Further, in order to verify the present Beq based 3D crack closure model, the fatigue crack propagation lives of 20CrMo steel round bars with elliptical surface cracks and 7475-T761 aluminum alloy sheets with corner cracks in edge region of their holes are predicted in this paper. The analytical results based on the present 3D model show that the 3D constraint effect on 3D fatigue crack growth can be eliminated, and fatigue crack propagation lives for both 20CrMo steel round bars and 7475-T761 aluminum alloy sheets with straight holes can be predicted accurately. The Beq based 3D crack closure model in the present paper can also be applied to analyze other complicated 3D fatigue cracks.
KW - 3D constraint effect
KW - Crack closure model
KW - Equivalent thickness B
KW - Fatigue crack propagation
UR - https://www.scopus.com/pages/publications/14544303203
U2 - 10.1016/j.ijfatigue.2004.12.005
DO - 10.1016/j.ijfatigue.2004.12.005
M3 - 文章
AN - SCOPUS:14544303203
SN - 0142-1123
VL - 27
SP - 617
EP - 623
JO - International Journal of Fatigue
JF - International Journal of Fatigue
IS - 6
ER -