Global analysis of drill string buckling in the channel of a curvilinear bore-hole

Gulyayev, V.I.; Shlyun, N

doi:10.1016/j.jngse.2017.01.021

Cited by 11 publications

(1 citation statement)

References 20 publications

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“…Normally, when purposely derived FE elements are applied to model drill-string dynamics, different variations of linear and nonlinear beam elements are used, without taking into account all nonlinearities arising from coupling of the torsional and axial or lateral DOFs. The main focus of previous studies was on inclusion of basic couplings between DOFs [19][20][21], gyroscopic effects [22], gravity [23], uncertaintities in drill-bit and rock interactions [24], the contacts with a bore-hole ( [25]) as well as fluid and drill-string interactions [26,27].…”

Section: Introductionmentioning

confidence: 99%

Bifurcation scenarios in helical buckling of slender rods using new FE

Kapitaniak

Vaziri

Wiercigroch

2020

International Journal of Engineering Science

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We develop a new Finite Element to accurately model twisting of rods and capture the bifurcation scenarios leading to helical buckling and various further post-buckling states. Since standard nonlinear beam elements do not account for nonlinearities in torsional modes, as well as for coupling between axial, lateral and torsional modes, we derive a new beam element, which allows us to describe complex helical buckling bifurcation scenarios of a rod subjected to a twisting load. The formulated beam element is systematically tested to assess its predictive capabilities in determining critical torsional buckling loads and its sensitivity to a number of elements used. Once the model is validated against commercial FE software (ABAQUS), we focus our attention on computing bifurcation scenarios to observe various complex helical configurations and transitions between them. The analysis reveals coexistence between helices with multiple loops for certain values of twisting load. Additionally, we trace the transition onsets between stable helical configurations. The developed FE can be applied to study complex buckling mechanics of engineering and biological structures.

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