A relatively simple model for pipeline quasistatic buckle propagation is presented. It is hypothesized that individually collapsing rings linked longitudinally by beams at the 12 o'clock and 6 o'clock positions can approximately reproduce the three dimensional aspects of the propagating buckle. The model formulates an equilibrium equation of a ring under pressure and concentrated force. This allows closed form equations to describe the force interaction between the beams and the rings. With this approach, the longitudinal bending work contribution to the energy balance equation can be evaluated and several documented aspects of buckle propagation can be explained. Predictions of the propagation pressure are within engineering agreement to experimental values. This novel description of buckle propagation leads to an improved understanding of the physical phenomenon.
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