Fatigue Analysis of the Structural Bottom of an Aluminum Planing Craft through Vibratory Load of the Propeller System

Authors

  • José Marín
  • Carlos Cuenca

DOI:

https://doi.org/10.25043/19098642.111

Keywords:

planing craft, fatigue

Abstract

This work analyzed the structural fatigue of a high-speed craft, which has a propeller system formed by two 493-hpengines connected through speed multipliers to water jet systems. Its aluminum alloy structure has combined-typeframing. The useful life of the boat bottom’s structure was determined considering the cyclical loads generatedby the propulsion system, using the Finite Elements method and applying the effort-number method of cycles tofailure. For this, a structural model was developed of the selected zone, which was analyzed with the SAP2000program, to obtain complex amplitudes of the stress supported by the structure. Thereafter, with these results thestress range was determined and, then, using S-N curves for Aluminum the number of cycles that needed to becarried out by six structural details selected was determined, for its failure. Using Miner’s Rule, combined with thecraft’s assumed work modes, the time of the useful life time of the referential details selected during an hour wasdetermined. Finally, if the craft operates for three hours per day, the bottom structure of the boat analyzed wouldhave a useful life of 14.5 years, when working principally in low speed rating.

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Author Biographies

José Marín

ESPOL. 1Facultad de Ingeniería Marítima, Ciencias Biológicas, Oceánicas y RR.NN. Guayaquil, Ecuador

Carlos Cuenca

SLEM S.A. Guayaquil, Ecuador

References

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Published

2015-01-23

How to Cite

Marín, J., & Cuenca, C. (2015). Fatigue Analysis of the Structural Bottom of an Aluminum Planing Craft through Vibratory Load of the Propeller System. Ciencia Y tecnología De Buques, 8(16), 57–75. https://doi.org/10.25043/19098642.111

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Section

Scientific and Technological Research Articles
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