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Study on inner shell crack propagation of LNG cryogenic storage tank during vacuum loss
YANG Fan1,2, CHEN Bao-dong2, JIANG Wen-quan2, JIA Yong-chang3
(1.College of Pipeline and Civil Engineering in China University of Petroleum, Qingdao 266580, China;2.College of Petroleum Engineering, Liaoning Shihua University, Fushun 113001, China;3.First Oil Production Plant in Qinghai Oilfield, PetroChina, Haixizhou 816400, China )
Abstract:
The stress-strain and crack tip atom structure of inner shell were studied after vacuum loss of LNG cryogenic storage tank vacuum. The micro-mechanism of inner shell crack propagation was discovered. The micro-crack propagation of inner shell after vacuum loss was simulated by molecular dynamics method. The changes of stress, strain, pressure and atom structure near the micro-crack were obtained at different moment. The results show that the stress reaches the maximum value first, then decreases and tends to be stable after vacuum loss of LNG storage tank. The stress strength factor KI is larger than KC, and the strain increases continuously. At the same time, the dislocation accumulates near crack and moves forward, which makes the crack extend.
Key words:  cryogenic storage tank  vacuum loss  crack propagation  molecular dynamics  dislocation