A Key Parameter in a Novel Fatigue Crack Growth Model

Abstract:

The effect of the load ratio, R, or the mean-stress on fatigue life has been recognized for more than a hundred years. In this paper we first describe a novel mechanics model for fatigue crak growth (FCG) under constant amplitude (CA) loading based on static fracture mechanics with thinking about the inertial effect coefficient and its impact to crack tip, and then discuss the relation between R-ratio and fatigue crak growth rate. Comparison of the present analysis with experimental data taken from the literature demonstrates that R-ratio has a greater impact to the fatigue crack propagation.

• Periodical: Advanced Materials Research (Volumes 163-167)
• Pages: 3186-3192
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.163-167.3186
• Online since: December 2010
• Authors: Li Xiong Gu, Zhi Fang Liu, Zhong Yong Xu
• Keywords: Constant Amplitude Loading, Fatigue Crack Growth Model, Inertial Effect Coefficient, Key Parameter

References

[1] Wheeler OE, Spectrum loading and crack growth. J Basic Eng, Trans ASME, SerD 1972; 94(1): 181-6.

[2] Goodman J. Mechanics applied to engineering. London: Longmans Green; 1899.

[3] Dowling NE. Mechanical behavior of materials: engineering methods for deformation fracture and fatigue. 2nd ed. Upper Saddle River (NJ): Prentice Hall; (1999).

[4] Paris, P.C., Erdogan, F., 1963. A critical analysis of crack propagation laws. ASME Journal of Basic Engineering 85, 528-534.

DOI: 10.1115/1.3656902

[5] Walker, K., 1970. The effect of stress ratio during crack propagation and fatigue for 2024-T3 and 7075-T6 aluminum. In: Effects of Environment and Complex Loading History on Fatigue Life, ASTMSTP 462. American Society for Testing and Materials, Philadelphia, PA, pp.1-14.

DOI: 10.1520/stp32032s

[6] Kujawski, D., 2001. A fatigue crack driving force parameter with load ratio effects. International Journal of Fatigue 23, 239-246.

DOI: 10.1016/s0142-1123(01)00158-x

[7] Kumar, R., Garg, S.B.L., 1988. Effect of stress ratio on effective stress range ratio and crack growth in 6061-T6 AL-alloy. International Journal of Pressure Vessels and Piping 35(5), 351-361.

DOI: 10.1016/0308-0161(88)90132-9

[8] Pippan, R., Bichler, C., Tabernig, B., Weinhandl, H., 2005. Overloads in ductile and brittle materials. Fatigue and Fracture of Engineering Materials and Structures 28, 971-981.

DOI: 10.1111/j.1460-2695.2005.00934.x

[9] Wu, X.R., Newman, J.C., Zhao, W., Swain, H.M., Ding, C.F., Phillips, E.P., 1998. Fatigue and Fracture of Engineering Materials and Structures 21(11), 1289-1306.

DOI: 10.1046/j.1460-2695.1998.00080.x

[10] Zhao, T., Jiang, Y., 2008. Fatigue of 7075-T651 aluminum alloy. International Journal of Fatigue 30, 834-849.

DOI: 10.1016/j.ijfatigue.2007.07.005

[11] Crooker, T.W., Krause, D.J., 1972. The influence of stress ratio and stress level on fatigue crack growth rates in 140 ksi YS steel. Report of NRL Progress. Naval Research Laboratory, Washington, DC, pp.33-35.

[12] Kumar, R., Pandey, A.K., 1990. Investigation of fatigue crack growth under constant amplitude loading. International Journal of Pressure Vessels and Piping 41(2), 179-192.

DOI: 10.1016/0308-0161(90)90040-o

[13] Zhang, M. The test methods analysis of threshold stress intensity factor of fatigue crack growth. Transaction of Nan Jing Aeronautics college, 1992, 10: 301-306, (in Chinese).

[14] Xu, Z.Y., The Investigation of Fatigue Crack Growth by Mechanics Approach. Modern Mathematics and Mechanics-Ⅷ, 2000, 11: 306-310, (in Chinese).