Abstract
The numerical simulation could help to understand the fracture mechanics behavior of high-pressure gas pipeline. The calculation results show that the internal high pressure of gas provides a driving force for crack propagation and tube wall deformation when the pipeline cracks and expands. Therefore, the rapid crack propagation tends to occur when the steel pipe is driven by high-pressure gas. In the process of steel pipe crack extension, immense internal high-pressure gas spewed from rupture and expand rapidly, compressing the air to form a series of compression wave which propagate rapidly and superpose together to form a shock wave eventually. Because the explosive wave of the pipe rupture has a high directivity, the energy distribution of gas is not uniform during the releasing process. What’s more, in pipe blasting, the longer distance, the more the surface vibration velocity decreases. In the vicinity of explosion source, the decreasing trend of the peak vibration velocity is significant. The vertical vibration velocity at the same point is larger than the longitudinal and tangential vibration speed.
Highlights
Gas pipeline has characteristics such as long conveying distance, big tube pressure and wide range of distribution
Based on the correct establishment of the dynamic finite element numerical calculation model, this paper studies the characteristics of the physical explosive shock wave and the formation and propagation mechanism of the explosive seismic wave in high-pressure gas pipeline, so as to provide important reference for solving such problems
A large number of internal high-pressure gas will spew from rupture and expand rapidly, compressing the air to form a series of compression wave which propagate rapidly and superpose together to form a shock wave eventually
Summary
Gas pipeline has characteristics such as long conveying distance, big tube pressure and wide range of distribution. Song and Belytschko [2] simulated crack and the crack propagation process of the thin-walled cylindrical shell under internal blast loading by extended finite element method, which has a good consistency with the experimental results. Yang Xiao-bin [5], based on the three linear pressure mode, explored the dynamic extension of rich-gas pipeline crack by finite. It proved that the rich-gas transportation pipeline is harder to crack, but based on the pressure attenuation area, linear attenuation relationship in reduced pressure zone can improve. Based on the correct establishment of the dynamic finite element numerical calculation model, this paper studies the characteristics of the physical explosive shock wave and the formation and propagation mechanism of the explosive seismic wave in high-pressure gas pipeline, so as to provide important reference for solving such problems
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
