Analysis of Multiaxial Low Cycle Fatigue Life for Single Crystal Ni-Based Superalloy Based on Two-Phase Unit Cell Model

Abstract:

Based on micro structure of Ni-based single crystal superalloy, a γ/γ’ two-phase unit cell finite element model was established, and its cyclic stress-strain was simulated under tension/torsion cyclic loading. A low cycle fatigue (LCF) life prediction model of single crystal superalloy was proposed by using cyclic plasticity strain energy as a parameter based on energy dissipation theory. Calculation results of macro finite element model and γ/γ’ two-phase unit cell micro finite element model, and multiaxial LCF test data of CMSX-2 Ni-based single crystal superalloy along [001] orientation were applied to fit the LCF life model by multiple linear regression. The results show that the unit cell model not only reflects the microstructure characteristics of single crystal Ni-based superalloy, but also is better than the macro model in accuracy of analysis, and greatly improve the accuracy of fatigue life prediction. Almost test data fall into the factor of 2.0 scatter band.

• Periodical: Applied Mechanics and Materials (Volumes 117-119)
• Pages: 503-508
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.117-119.503
• Online since: October 2011
• Authors: Zhi Ping Ding, Ming Li, Teng Fei Wang, Rong Hua Yang
• Keywords: Life Prediction, Low Cycle Fatigue, Single Crystal Superalloy, Unit Cell Model

References

[1] Zhiping Ding, Jiping Chen, Zeyong Yin, et al: Journal of aeronautical materials. Vol. 26 (2006) No.4, pp.6-10 (In Chinese)

[2] Mitsuru kanda, Masao Sakane, Masateru Ohnami: Journal of Engineering Materials and Technology. Vol. 4(1997), pp.153-160.

[3] M. Okazaki , M. Sakaguchi: International Journal of Fatigue. Vol. 30(2008), pp.318-323

[4] F.T. Meissonnier, E.P. Busso, N.P. O'Dowd: International Journal of Plasticity. Vol. 17(2001), pp.601-640

[5] Yunqiang Guo, Keshi Zhang, Xiaoliang Geng, et al: Rate metal materials and engineering. Vol. 36(2007) No. 8, pp.1331-1335 (In Chinese)

[6] Zhiping Ding:(Study on multiaxial LCF damage of single crystal Ni-based superalloy (Ph.D., Center South University, China 2005), pp.41-76 (In Chinese)

[7] Shuguang Gong, Guilan Xie, Yunqing Huang, et al. Ansys parametric programming and command manual(Machinery Industry Press, Beijing 2009). (In Chinese)

[8] Xiaoqun He, Wenqin Liu. Applied regression analysis(China Renmin University Press, Beijing 2007). (In Chinese)