Dynamic fracture study by an experiment/simulation method for rich gas transmission X80 steel pipelines

The drop weight tear tests (DWTTs) are conducted to obtain the material toughness (CTOA)C (crack tip opening angle) for X80 pipeline steel, and the empirical formulas for X70 steel are modified because of the inaccuracy in the toughness evaluation of X80 steel. Based on the experimental data of the full-scale burst test, the dynamic crack propagation of the rich gas transmission pipeline is simulated using the finite element method. A multi-parameter state equation is applied in the simulation and the three-stage linear decompression model of rich gas is put forward. The different factors affecting the dynamic crack propagation are also discussed. The reliability for rich gas pipeline engineering is evaluated though the experiment and simulation in this paper.