PSI - Issue 14

Ritu. J. Singh et al. / Procedia Structural Integrity 14 (2019) 549–555 Ritu .J.Singh / Structural Integrity Procedia 00 (2018) 000–000

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observed in the case considering isotropic properties. This can be attribute to limited yielding developed in anisotropic case and hence lower residual stresses. 4. Conclusions Autofrettage of a thick cylinder made from Zr 2.5% Nb was studied using isotropic and anisotropic material properties to investigate its effect on residual stresses. It was observed that during the autofrettage, the residual stress obtained for the two material model was substantially different. For anisotropic material properties as per the hills yield criterion the yielding initiates at higher pressure compared to isotropic material model. This leads to lesser plastification of the cylinder compared to isotropic case for a given expansion pressure and hence results in lower residual stresses. ABAQUS Documentation Manual. n.d. “No Title.” 6.12. Bouzid, A-H, A-HI Mourad, and A El Domiaty. 2015. “Impact of Bauschinger Effect on the Residual Contact Pressure of Hydraulically Expanded Tube-to Tubesheet Joints.” Procedia Engineering 130: 176–92. Cheong, Yong-Moo, Sung-Soo Kim, and Young-Suk Kim. 2002. “Temperature Effect of Dynamic Anisotropic Elastic Constants of Zr--2.5 Nb Pressure Tube by Resonant Ultrasound Spectroscopy.” Journal of Nuclear Materials 303 (2–3): 83–91. Christodoulou, N, M Resta Levi, P A Turner, E T C Ho, and C K Chow. 2000. “Anisotropy of Yielding in a Zr-2.5 Nb Pressure Tube Material.” Metallurgical and Materials Transactions A 31 (2): 409–20. Gao, Xin-lin. 1992. “An Exact Elasto-Plastic Solution for an Open-Ended Thick-Walled Cylinder of a Strain-Hardening Material.” International Journal of Pressure Vessels and Piping 52 (1): 129–44. Hill, R. (1948). A theory of the yielding and plastic flow of anisotropic metals. Proc. R. Soc. Lond. A , 193 (1033), 281-297. Hu, Zhong, and Sudhir Puttagunta. 2012. “Computer Modeling of Internal Pressure Autofrettage Process of a Thick-Walled Cylinder with the Bauschinger Effect.” American Transactions on Engineering and Applied Science 1 (2): 143–61. Huang, Xiaoping, and Tian Xie. 2011. “Modeling Hydraulically Expanded Tube-to-Tubesheet Joint Based on General Stress-Strain Curves of Tube and Tubesheet Materials.” Journal of Pressure Vessel Technology 133 (3): 31205. Lee, Eun-Yup, Young-Shin Lee, Qui-Ming Yang, Jae-Hoon Kim, Ki-Up Cha, and Suk-Kyun Hong. 2009. “Autofrettage Process Analysis of a Compound Cylinder Based on the Elastic-Perfectly Plastic and Strain Hardening Stress-Strain Curve.” Journal of Mechanical Science and Technology 23 (12): 3153– 60. Tian, Xie, Xiao Ping Huang, and Zhi Yong Fu. 2010. “Determination of Expanding Pressure of Hydraulically Expanded Tube-to-Tubesheet Joint.” In Advanced Materials Research, 97:2898–2902. 310.4 References