Fatigue-Life Assessment of InaTEWS Tsunami Buoys

Suastika, Ketut and ., Sahlan and Nugroho, Wibowo H. and Zubaydi, Achmad (2014) Fatigue-Life Assessment of InaTEWS Tsunami Buoys. In: International Conference n Marine Technology, 24-26 October, Surabaya, Indonesia.

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The Indonesia tsunami early warning system (InaTEWS) utilizes a number of surface buoys which are
installed and operated at a number of locations in Indonesia seas, namely, off the West coast of the Sumatra island
and off the South coast of the Java island. A critical structural component of the surface buoy is its keel structure,
which was manufactured from a previously used ship propeller shaft. Due to the cyclic nature of the loading and the
utilization of used material, a fatigue-life assessment of the keel structure is required. For that purpose, fatigue tests
were performed to determine the S-N curve of the material. The experimentally obtained S-N curve has a slopesof
approximately -1/14 or a value of m = -1/sof approximately 14, indicating that the fatigue strength of the material is
very much lower than a typical new carbon steel,which has a value of m of 3 or 4. Furthermore, model tests were
conducted to measure the wave load on the mooring line. Results of spectral fatigue calculations including the
Rayleigh approximation of narrow-banded spectrum and those taking into account band-width effects, show that the
fatigue life of the keel structure is approximately 15 years.

Item Type: Conference or Workshop Item (Speech)
Uncontrolled Keywords: fatigue life, tsunami buoy, InaTEWS, spectral method
Subjects: T Technology > TA Engineering (General). Civil engineering (General) > TA418.38 Materials--Fatigue.
Divisions: Faculty of Marine Technology (MARTECH) > Naval Architecture and Shipbuilding Engineering
Depositing User: - Davi Wah
Date Deposited: 01 Aug 2019 18:22
Last Modified: 01 Aug 2019 18:22
URI: http://repository.its.ac.id/id/eprint/68930

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