Elastic and Plastic Analysis of O-Ring Seal for Reactor Pressure Vessel

Abstract:

The elasto-plastic analysis for Reactor Pressure Vessel seal is necessary because of nuclear safety is actively demanded. The existed work based on simplified way to simulate the seal ring, such as uniform stress, spring elements, is too conservative. Therefore, it is necessary to simulate seal ring using 3D solid model considering the elasto-plastc deformation. In this paper, the two-dimensional model is adopted to simulate the compressing and springback character of inconel 718 O-ring using nonlinear isotropic hardening constitutive model and contact algorithm. The simulation approach and constitutive model are validated according to the deformation of seal ring using ANSYS. The seal analysis for reactor pressure vessel is achieved by considering complex loads, such as bolt pre-tightening force and temperature/pressure transient with the usage of an elasto-plastic constitutive model. It is found that the deformation of seal ring obtained by finite element is close to true value. The application of 3D solid model can reduce excessive conservatism effectively and improve the precision of seal analysis compare to the simplified method.

• Periodical: Key Engineering Materials (Volume 725)
• Pages: 339-344
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.725.339
• Online since: December 2016
• Authors: Xue Jiao Shao, Lian Gang Zheng, Li Ping Zhang, Xiao Long Fu
• Keywords: Elastic-Plasticity, O-Ring, Reactor Pressure Vessel, Separating

References

[1] Pan Jiazhen. Handbook of pressure vessel materials of carbon steel and alloy steel [M]. Beijing: Chemical Industry Press, (2000).

[2] Liu Hougui. Seal technology [M]. Changsha: Hunan science and Technology Press, (1981).

[3] Hu Guozhen, Shi flow, Yan Jiabin. Chemical seal technology [M]. Beijing: Chemical Industry Press, (1991).

[4] Du Xuesong, Lin Tengjiao, Li Runfang, Xu Mingyu. Improvement of the three-dimensional 3D seal analysis program for nuclear pressure vessels [J]. Journal of Chongqing University (Natural science edition), 2003, 26 (10): 93-96.

[5] Xu Mingyu, Lin Lin, Li Runfang, Du Xuesong. Transient thermal elastic plastic contact efficient solution for the reactor pressure vessel seal system [J]. nuclear power engineering, 2005, 26 (1): 40-43.

[6] Yin Biao he, song Jiadi, sinus Yikang. Metal O-ring seal performance of reactor pressure vessel [J]. CPVT, 2004, 21 (9): 9-12.

[7] Zheng Liangang, Zhang Liping, Yang Yu, Zang Fenggang. Seal analysis technology for reactor pressure vessel. Nuclear power engineering, 2009, 30(3): 4-6.

[8] Cai Lixun, Ye Yuming, Zuo Guo. Elastic and plastic behavior of O-ring speciments of inconel 718 alloy under side-compressing at elevated temperatures[J]. Journal of Shanghai Jiaotong University, 2005, 39 (5): 818-822.

[9] Nuclear Power Design and Research Institute of the intelligence room, research report aout the technology of pressurized water reactor pressure vessel flange seal[R], (1990).