Fauzi, Muhammad (2016) Analisa Umur Kelelahan Struktur Sepinggan Q Platform Yang Memiliki Retak Awal Semi-Elliptical Dengan Menggunakan Metode Linear Elastic Fracture Mechanics. Undergraduate thesis, Institut Teknology Sepuluh Nopember.
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Abstract
Fatigue adalah salah satu masalah yang dapat dijumpai dalam operasi struktur
bangunan lepas pantai. Fatigue pada struktur terjadi pada sambungan terkritis
struktur dan mengalami perambatan akibat beban siklis hingga terjadi kegagalan
struktur. Sambungan tubular terkritis ditentukan berdasarkan nilai fatigue damage
tertinggi yang terjadi pada multiplanar tubular joint 502. Metode yang digunakan
dalam penelitian ini adalah dengan pendekatan fracture mechanics. Pemodelan
retak awal dilakukan pada titik hotspot dimana terjadi tegangan terbesar. Analisis
ini dimulai dengan menentukan stress intensity factor (SIF) dan laju perambatan
retak yang terjadi pada titik hotspot sehingga umur kelelahan struktur dapat
diprediksi. Hasil analisis yang didapat yaitu besarnya nilai SIF dengan pembebanan
maksimum adalah 6,86 MPa√m sedangkan besarnya nilai SIF dengan pembebanan
minimum adalah 6,02 MPa√m. Laju perambatan retak yang terjadi pada tubular
joint 502 sebesar 1,59 x 10-10 in/cycle. Perhitungan umur kelelahan struktur
menggunakan metode fracture mechanics adalah 1,12 x 108 cycles (27 tahun).
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Fatigue is one of the problems that frequently in the operational stage of offshore
structures. Fatigue at structure caused by crack in critical joint of the structure and
can propagate due to cyclic load up to structure failure. Most critical joint was
determined by the highest fatigue damage at the multiplanar tubular joint 502. The
method used in this research was fracture mechanics approach. Modelling the
initial crack at the hotspot point, which has the highest stress. This analysis began
by determined the stress intensity factor (SIF) and crack propagation rate at the
hotspot point so that the fatigue life of the structure can be predicted. The analytical
results obtained are the value of the SIF with the maximum loading is 6.86 MPa√m
while the value of the SIF with minimum loading was 6.02 MPa√m. The crack
propagation rate in the tubular joint 502 was 1.59 x 10-10 in/cycle. The prediction
of the fatigue life of the structure using fracture mechanics approach was 1.12 x
108 cycles (27 years).
| Item Type: | Thesis (Undergraduate) |
|---|---|
| Additional Information: | RSKe 620.112 6 Fau a |
| Uncontrolled Keywords: | fatigue damage, fracture mechanics, hotspot, laju perambatan retak, stress intensity factor |
| Subjects: | T Technology > TC Hydraulic engineering. Ocean engineering > TC1665 Offshore structures--Materials. |
| Divisions: | Faculty of Marine Technology (MARTECH) > Ocean Engineering > 38201-(S1) Undergraduate Thesis |
| Depositing User: | Mr. Tondo Indra Nyata |
| Date Deposited: | 04 Feb 2020 02:44 |
| Last Modified: | 04 Feb 2020 02:44 |
| URI: | http://repository.its.ac.id/id/eprint/74589 |
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