Sibu, Agustinus Daddy (2016) Analisa Umur Kelelahan pada Platform Kerindingan K Menggunakan Pendekatan Mekanika Kepecahan. Undergraduate thesis, Institut Technology Sepuluh Nopember.
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Abstract
Bangunan terpancang tersusun atas deck, jacket dan pile sebagai penyokongnya.
Sambungan tubular menjadi komponen utama pendukung jacket. Dalam masa
operasinya, struktur akan mengalami fatigue akibat beban cyclic. Sambungan
dengan konsentrasi tegangan terbesar akan memicu terjadinya retak awal dan
perambatan retak yang akan mengurangi umur struktur. Perhitungan umur
kelelahan dilakukan pada Platform Kerindingan K milik Chevron Indonesia
Company (CICo) dengan metode Linear Elastic Fracture Mechanics (LEFM).
Pemodelan dan analisa fatigue global dilakukan dengan software SACS 5.6 yang
menghasilkan joint kritis 558. Sedangkan analisa lokal untuk pengaruh dari
perambatan crack dengan retak awal (a) 0.5 mm dan panjang (2c) 3.3mm dilakukan
dengan software ANSYS 16.0. Analisa ini menghasilkan nilai Stress Intensity
Factor (SIF) untuk pembebanan maksimum dan minimum masing-masing adalah
sebesar 2.17 ksi√in dan 1.98 ksi√in. Dengan laju perambatan crack sebesar 5.71E-
12 in/cycle, maka diperoleh umur kelelahan pada Platform Kerindingan K adalah
sebesar 3.7 tahun.
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A fixed platform is composed of deck, jacket, and pile. Tubular connection becomes
a major component of jacket. A critical aspect in the design of the fixed platform is
the fatigue performance due to cyclic loads during the life time. The joint that has
highest stress concentration lead to crack initiation and propagation which will
reduce the life of the structure. Fatigue life calculations were performed on
Kerindingan K Platform of Chevron Indonesia Company (CICO) using Linear
Elastic Fracture Mechanics Method (LEFM). The modelling and analysis of global
fatigue were done with SACS software 5.6. The global analysis result is critical
joint 558. Then the local analysis due to crack initiation (a) 0.5 mm for length of
(2c) 3.3mm was done with ANSYS 16.0. This analysis produced the value of SIF
(Stress Intensity Factor). The maximum value for SIF is 2.17 ksi√in and the
minimum value is 1.98 ksi√in. For crack propagation rate at 5.71E-12in/cycle, the
fatigue life on Kerindingan K Platform after crack propagation is 3.7 years.
| Item Type: | Thesis (Undergraduate) |
|---|---|
| Additional Information: | RSKe 627.98 Sib a |
| Uncontrolled Keywords: | cyclic, crack, fatigue, fracture mechanics, stress intensity factor |
| Subjects: | T Technology > TC Hydraulic engineering. Ocean engineering > TC1680 Offshore structures |
| Divisions: | Faculty of Marine Technology (MARTECH) > Ocean Engineering > 38201-(S1) Undergraduate Thesis |
| Depositing User: | Mr. Tondo Indra Nyata |
| Date Deposited: | 25 Feb 2020 03:55 |
| Last Modified: | 25 Feb 2020 03:55 |
| URI: | http://repository.its.ac.id/id/eprint/75155 |
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