Resonant Fatigue Tests on Drill Pipe Connections with Different Geometries and Sizes

Santus, Ciro; Romanelli, Lorenzo; Burchianti, Alessandro; Inoue, Tomoya

doi:10.3390/app13148006

Cited by 2 publications

(1 citation statement)

References 55 publications

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“…The resonant fatigue test rig for long tubular structures was utilized by the authors of this research in previous studies, as in Refs. [50,51], and in subsequent years, some changes were proposed to improve the performance of the tests. This test rig is similar to other testing machines, as shown in Refs.…”

Section: Introductionmentioning

confidence: 99%

Resonant Fatigue Tests on Polished Drill Pipe Specimens

Santus,

Romanelli,

Bertini

et al. 2024

Machines

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In this study, the fatigue strength of polished drill pipe specimens was investigated and compared with previous test results of corroded and not-corroded pipes. The resonant fatigue test rig, which was designed and implemented by the University of Pisa, is initially presented by providing a detailed description of the set-up of the machine, the calibration of the strain gauges, the control system, and the correct identification of the vibrational node locations. A polishing rig was also designed and put into operation to remove the corrosion pits from the outer surface of almost the entire length of the drill pipe specimens. After the fatigue tests with the resonant rig, and the observation of the fatigue fracture of the specimens, a few samples were extracted from different zones (corroded and not corroded) of the failed drill pipe specimens. This allowed for investigations to be carried out using a scanning electronic microscope. The obtained results were analyzed using the Murakami model, and a discussion is presented about the effect of the corrosion pits on the fatigue strength.

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Section: Introductionmentioning

confidence: 99%

Resonant Fatigue Tests on Polished Drill Pipe Specimens

Santus,

Romanelli,

Bertini

et al. 2024

Machines

Self Cite

View full text Add to dashboard Cite

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Experimental investigations on normal mode nodes as support positions of a resonant testing facility for bending fatigue tests

Schramm,

Birkner,

Schneider

et al. 2024

Fatigue Fract Eng Mat Struct

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Large‐scale fatigue testing is very important to the research on scale effects, which occur in large cyclic loaded structures, such as wind turbine towers. However, such experimental testing has a very high energy consumption. As an efficient alternative, this paper presents a new resonant testing facility for large‐scale specimens under cyclic bending loads. The facility works as a 4‐point bending test, in which the specimen is supported in the nodes of its first normal bending mode, where theoretically no reaction forces occur. Two counter‐rotating imbalance motors with excitation frequencies near resonance generate a harmonic force acting on the specimen. Experimental trial fatigue tests on a steel pipe as a specimen were carried out, in order to validate the new testing setup. A great decrease in the support forces was reached by placing the supports at the normal mode nodes. Additionally, the behavior of the support forces under varying positions and excitation frequencies was also investigated. In summary, the resonant testing method combined with the supports at the normal mode nodes offers an efficient and energy‐saving testing setup for large‐scale fatigue tests.

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Resonant Fatigue Tests on Drill Pipe Connections with Different Geometries and Sizes

Cited by 2 publications

References 55 publications

Resonant Fatigue Tests on Polished Drill Pipe Specimens

Resonant Fatigue Tests on Polished Drill Pipe Specimens

Experimental investigations on normal mode nodes as support positions of a resonant testing facility for bending fatigue tests

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