Damage and blasting failure of marine riser with slips bite-mark

For exploring the pipe damage and blast failure mechanical behavior under the slips clamped operation is of critical importance in oil & gas production safety, the thick-walled cylinder hypothesis and elastic-plastic mechanics theory are applied to analyze pipe damage mechanical behavior under the slips clamped while the elliptical crack hypothesis and fracture damage mechanics theory are used to describe the pipe bite marks geometric characteristics. Further, the functional relationship between the bite mark and the slip structural parameters is determined and provides methods to estimate the burst pressure of the pipe with the bite mark. An experimentally validated FEM is used to study pipe blast failure mechanical behavior and the simulation results indicated the blast failure usually occurs in the two long narrow zones with a certain distance from the endpoint on both sides of the bite marks zone and the burst pressures obtained based on the proposed analytical model are in good agreement with the numerical results but relatively conservative. Furthermore, the sensitive parameters research indicates that the slip tooth space, tooth up and down inclination angle have an almost negligible effect on the pipe burst pressure, the pipe burst pressure decreases with the increases of bite-mark depth, slip teeth number, and edge thickness.