E Dadkhah - PH.D student of Tabriz University, Department of Civil Engineering, Earthquake Engineering
M kheirollahi - PH.D student of Sahand University of Technology, Department of Civil Engineering, Structural Engineering
Hassan sani - Master Graduated of Tabriz University, Department of Civil Engineering, Hydraulic Structures
Farhad Alizadeh Afshar - M.Sc ,Civil Engineering

Local buckles induced by excessive force on specific part of pipeline can locally reduce the collapse pressure of a pipeline and cause local failure. This, in turn, can initiate a buckle which propagates at high speed and has the potential of destroying the whole line. Periodic placement of buckle arrestors along the pipeline can ensure that collapse only effect the length of pipe between two arrestors on either side of the initiation site. In the present study, the propagation and arresting of dynamic buckle are modeled using the finite element method. For the post buckling analysis, the material and geometrical nonlinearity are considered. The effects of different diameter to thickness ratio of pipeline (D/t), arrestor’s thickness to pipe’s thickness ratio (h/t), and arrestor’s length to pipe’s diameter ratio (La/D)on cross over pressure, speed of dynamic bucke propagation have been evaluated.

Dynamic Buckle Propagation, Buckle Arrestor, Arrestor Spacing, Velocity of Propagation, Diameter to Thickness Ratio