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A modal approach to identify fatigue damage in threaded connections of large scale tubular structures in a resonant bending test rig

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Abstract
The current work aims at using a modal approach to detect fatigue damage of threaded connections in large scale tubular structures. A full scale resonant bending fatigue test rig has been developed to test at first a plain pipe with notches. Two kinds of vibration testing are used for fatigue crack detection. Forced vibration tests (input-output) are performed before and after the fatigue test, in which input signals from forced excitation as well as output signals from accelerometers and dynamic strain gauges are both recorded. Whereas, the ambient vibration test (output only) follows the fatigue experiment. The modal parameters of the structure can be determined from the acquired data using subspace identification algorithms, i.e. the Reference-based Combined Deterministic-Stochastic Subspace Identification one for the forced vibration tests and the Reference-based Stochastic Subspace Identification one for the ambient vibration test. An observed change in the extracted modal parameters implies the degradation of the bending stiffness when a fatigue crack initiates. The modal approach demonstrates to be a viable and reliable way to detect fatigue cracks in large scale tubular structures. This potentiality makes vibration based testing a complement to conventional approaches like e.g. global deflection control; moreover, it is rather simple to implement and can be used for longterm monitoring.
Keywords
Ambient, vibration test, Modal analysis., Forced vibration test, Resonant bending test rig, Threaded connection, Subspace identification, Pipeline

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Chicago
Bui, TienThanh, Edwin Reynders, Guido De Roeck, Jeroen Van Wittenberghe, Patrick De Baets, and Wim De Waele. 2011. “A Modal Approach to Identify Fatigue Damage in Threaded Connections of Large Scale Tubular Structures in a Resonant Bending Test Rig.” In 8th International Conference on Structural Dynamics, Proceedings, ed. Guide De Roeck, G Degrande, G Lombaert, and G Müller, 1623–1628. Ghent, Belgium: Ghent University, Department of Mechanical construction and production.
APA
Bui, T., Reynders, E., De Roeck, G., Van Wittenberghe, J., De Baets, P., & De Waele, W. (2011). A modal approach to identify fatigue damage in threaded connections of large scale tubular structures in a resonant bending test rig. In Guide De Roeck, G. Degrande, G. Lombaert, & G. Müller (Eds.), 8th international conference on structural dynamics, Proceedings (pp. 1623–1628). Presented at the 8th International Conference on Structural Dynamics (Eurodyn - 2011), Ghent, Belgium: Ghent University, Department of Mechanical construction and production.
Vancouver
1.
Bui T, Reynders E, De Roeck G, Van Wittenberghe J, De Baets P, De Waele W. A modal approach to identify fatigue damage in threaded connections of large scale tubular structures in a resonant bending test rig. In: De Roeck G, Degrande G, Lombaert G, Müller G, editors. 8th international conference on structural dynamics, Proceedings. Ghent, Belgium: Ghent University, Department of Mechanical construction and production; 2011. p. 1623–8.
MLA
Bui, TienThanh, Edwin Reynders, Guido De Roeck, et al. “A Modal Approach to Identify Fatigue Damage in Threaded Connections of Large Scale Tubular Structures in a Resonant Bending Test Rig.” 8th International Conference on Structural Dynamics, Proceedings. Ed. Guide De Roeck et al. Ghent, Belgium: Ghent University, Department of Mechanical construction and production, 2011. 1623–1628. Print.
@inproceedings{1860054,
  abstract     = {The current work aims at using a modal approach to detect fatigue damage of threaded connections in large scale tubular structures. A full scale resonant bending fatigue test rig has been developed to test at first a plain pipe with notches. Two kinds of vibration testing are used for fatigue crack detection. Forced vibration tests (input-output) are performed before and after the fatigue test, in which input signals from forced excitation as well as output signals from accelerometers and dynamic strain gauges are both recorded. Whereas, the ambient vibration test (output only) follows the fatigue experiment. The modal parameters of the structure can be determined from the acquired data using subspace identification algorithms, i.e. the Reference-based Combined Deterministic-Stochastic Subspace Identification one for the forced vibration tests and the Reference-based Stochastic Subspace Identification one for the ambient vibration test. An observed change in the extracted modal parameters implies the degradation of the bending stiffness when a fatigue crack initiates. The modal approach demonstrates to be a viable and reliable way to detect fatigue cracks in large scale tubular structures. This potentiality makes vibration based testing a complement to conventional approaches like e.g. global deflection control; moreover, it is rather simple to implement and can be used for longterm monitoring.},
  author       = {Bui, TienThanh and Reynders, Edwin and De Roeck, Guido and Van Wittenberghe, Jeroen and De Baets, Patrick and De Waele, Wim},
  booktitle    = {8th international conference on structural dynamics, Proceedings},
  editor       = {De Roeck, Guide and Degrande, G and Lombaert, G and M{\"u}ller, G},
  isbn         = {9789076019314},
  keyword      = {Ambient,vibration test,Modal analysis.,Forced vibration test,Resonant bending test rig,Threaded connection,Subspace identification,Pipeline},
  language     = {eng},
  location     = {Leuven, Belgium},
  pages        = {1623--1628},
  publisher    = {Ghent University, Department of Mechanical construction and production},
  title        = {A modal approach to identify fatigue damage in threaded connections of large scale tubular structures in a resonant bending test rig},
  year         = {2011},
}