This chapter provides a combined computational and analytical study to
investigate the lateral impact behavior of pressurized pipelines and inspect effects of
important parameters such as the outside diameter and internal pressure on such
behavior. A total of more than 300 numerical simulations are carried out on mild
steel pipe models with different internal pressure levels and were struck at the mid-span
and at the one quarter span positions. These numerical simulations of the impact
tests are performed using 3D dynamic nonlinear finite element analysis (FEA)
through LS-DYNA, where both geometrical and material nonlinearities are
considered. The computational results for the first time systematically reveal the
effects of internal pressure, impact position, and outside diameter on the lateral
impact behavior of the pipeline models. Quartic polynomial functions are applied to
formulate the maximum crushing force (Fmax), maximum permanent displacement
(Wf), and absorbed energy (Ep) of the pressurized pipelines during the impact
problem. The effects of the diameter and pressure on F, W, and E are therefore
illustrated through analyzing those functions. Response surfaces are also plotted
based on the generated quartic polynomial functions and the quality (accuracy) of those functions are verified through several techniques. The outcomes of this study
have potential benefits on research of safety and reliability of pressurized pipelines
in hydraulic system of aerospace and development of advanced pipeline materials.
Keywords: Collapse mechanism, Computer modeling and simulation,
Lateral impact, LS-DYNA, Pressurized pipeline.
