Fatigue Analysis of the Structural Bottom of an Aluminum Planing Craft through Vibratory Load of the Propeller System
DOI:
https://doi.org/10.25043/19098642.111Keywords:
planing craft, fatigueAbstract
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.Downloads
References
AEROSPACE SPECIFICATION METALS Inc. MatWeb. [Online]. http://asm.matweb.com/ search/SpecificMaterial.asp?bassnum=MA5086H116
AMERICAN BUREAU OF SHIPPING, "Guide for Building and Classifying High-speed Craft". ABS, 2012.
AMERICAN BUREAU OF SHIPPING, "Structural Direct Analysis for High Speed Craft". ABS, 2011.
ASTINAVE E.P., Memoria Técnica de la Lancha Guayas. Guayaquil, 2011.
BANNANTINE, J., COMER, J., and HANDROCK, J., Fundamentals of Metal Fatigue Analysis. Pearson Edition, 1990.
CUENCA, C., Determinación de la Vida Útil del fondo de una embarcación construida en Aluminio por Carga Vibratoria del Sistema Propulsivo. Tesis de Ingeniería Naval, FIMCBOR, ESPOL, Guayaquil, 2014
DET NORSKE VERITAS, Rules for Classification of Speed, Light Craft, and Naval Surface Craft, DNV, 2011.
European Committee for Standardization, Eurocode 9: Design of Aluminium Structures, Brussels, 2011.
HAMILTON JET, Manual de diseño de la serie HJ de Hidrojets, 2007.
KOROTKIN, A., Added Masses of Ship Structures. Springer, 2009.
LONG, CH., Propellers, Shafting, and Shafting System Vibration Analyses, Cap. X en Marine Engineering, Harrington, Ed., SNAME, 1992.
MARÍN, J., MIRANDA, L., and MACAS, F., Análisis de resultados propulsivos en una lancha planeadora de 11 m. Jornadas Técnicas sobre Propulsión de Buques, Colegio de Ingenieros Navales del Ecuador, Guayaquil, 2011.
MORENO, V., Motores de Combustión Interna, Vol. II. Escuela Técnica Superior de Ingenieros Navales, Madrid, 1980.
OTERO, C., Tipología y análisis de fallos en la estructura de los buques mercantes, 2ª parte. Revista Ingeniería Naval, Nov. 2004.
Published
How to Cite
Issue
Section
License
The authors who publish in this Journal certify that:
- The work submitted for publication in The Ship Science and Technology journal, was written by the author, given that its content is the product of his/her direct intellectual contribution.
- All data and references to material already published are duly identified with their respective credits and are included in the bibliographic notes and quotations highlighted as such.
- All materials submitted for publication are completely free of copyrights; consequently, the author accepts responsibility for any lawsuit or claim related with Intellectual Property Rights thereof, Exonerating of responsibility to The Science and Technology for the Development of Naval, Maritime, and Riverine Industry Corporation, COTECMAR.
- In the event that the article is chosen for publication by The Ship Science and Technology journal, the author state that he/she totally transfers reproduction rights of such to The Science and Technology for the Development of Naval, Maritime, and Riverine Industry Corporation, COTECMAR.
- The authors retain the copyright and transfer to COTECMAR the right of publication and reproduction of the work which will be simultaneously subject to the Creative Commons Attribution License (CC -BY) , which allows the license to copy, distribute, display and represent the work and to make derivative works as long as it recognizes and cites the work in the manner specified by the author or licensor.
- For more information about the Creative Commons Attribution License (CC -BY) and his use and scope, please visit the following web page https://creativecommons.org/licenses/by-sa/4.0/legalcode