Studies on Strain Fatigue Crack Growth Rate Controlled by Displacement or Load of 16MnR Steel

Abstract:

In order to understand the strain fatigue crack growth rate of pressure vessel steel controlled by displacement or load, we did experiments on strain fatigue of 16MnR steel and describe the fatigue with the energy method. We have obtained delayed cycle curve of strain fatigue controlled by displacement or load and calculated the J-integral at crack tip. In order to compare strain fatigue crack growth rates of 16MnR steel on two conditions，we compute weighted means of the strain fatigue controlled by displacement or load. Comparing two kinds of fatigue growth rate, it is obvious that the crack growth rate of fatigue controlled by displacement is greater than that controlled by load. All experiments show that compress plastic energy is higher, the fatigue growth rate of 16MnR is lower.

• Periodical: Advanced Materials Research (Volumes 243-249)
• Pages: 5680-5685
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.243-249.5680
• Online since: May 2011
• Authors: Yan Yan, An Zhong Liu, Dao Xiang Zhou
• Keywords: Fatigue, Fracture Mechanic, Metal Materials

References

[1] P.Guo, H.J.Hu and P.N.L: Journal of Shanghai University, Vol. 3(1997) No.5, pp.22-29.

[2] P.Zhang, F.Zhang and Y.Wang: Chemical Equipment and Pipeline， Vol.42 (2005) NO.6, pp.48-49.

[3] Y.Xiong, B.B. Chen, S.L. Zheng, and Z.L. Gao: Acta Metallurgica Sinica, Vol.49 (2009) NO.7, pp.849-855.

[4] Z.X. Xing J.C. Jiang: China Petroleum Machinery, Vol.2 (2004) NO.2, pp.5-6.

[5] N.E. Dowling and J.A. Begley: Fatigue Crack Growth during Gross Plasticity and the J-Integral. ASTM STP590-EB (1976). pp.82-103.

DOI: 10.1520/stp33940s

[6] O.Vardar: Journal of Engineering Materials and Technology, Vol.104(1982),pp.192-199.

[7] Z.Y. Dai: Journal of Southwest Jiaotong University, Vol.27 (1992) No.6. pp.12-18.