Dynamic Ductile Fracture Toughness Test and Numerical Simulation for Ultra-High Pressure Gas Pipelines

摘要

Defects introduced by steel pipe manufacturing and pipeline construction are the primary reasons of pipeline rupturing. Preventing pipeline from rapid crack propagation is a critical problem to avoid casualty and disaster. Since high strength ductile steel pipelines have been widely used by gas industry, most of the former empirical formula and algorithm are no longer applicable to today's operating conditions. New arrest criteria, experiments and numerical simulations are necessary to put forward to control the velocity and distance of crack propagation. This paper tries to calibrate methods in measuring pipeline toughness through a number of toughness tests, simulating the state of dynamic crack propagation in reaction against supersonic jet steam, in the aim of establishing an enclosed evaluation system under optional operating conditions.