Mahendra, Caesar Adza (2019) Analisis Umur Kelelahan XA-Pro Platform Menggunakan Metode Fracture Mechanics Dengan Mempertimbangkan Variable Amplitude Load. Other thesis, Institut Teknologi Sepuluh Nopember.
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Abstract
Di Indonesia, anjungan lepas pantai didominasi oleh ajungan lepas pantai terpancang (fixed platform) dengan rata-rata masa beroperasi sudah lebih dari 20 tahun. Oleh karena itu umur kelelahan pada struktur lepas pantai harus diketahui untuk mengantisipasi salah satu penyebab utaman kegagalan sebuah struktur terutama di lepas pantai. Pada penelitian ini akan dilakukan analisis umur kelelahan sebuah anjungan lepas pantai terpancang (fixed platform) menggunakan metode fracture mechanics. Struktur yang dijadikan objek penelitian adalah XA-Pro Platform milik Pertamina EP. Struktur akan dianalisa lokal setelah diketahui umur kelelahan secara global dengan metode cumulative damage. Pada analisa menggunakan metode fracture mechanics diawali dengan menentukan joint kritis pada struktur yang memiliki umur kelelahan terendah akibat beban lingkungan dengan bantuan software. Kemudian dilakukan analisis perambatan retak pada joint kritis tersebut dengan persamaan Paris Law yang telah dimodifikasi oleh Barsom (1999) pada kondisi Variable Amplitude Load sehingga diperoleh umur kelelahan struktur tersebut menggunakan metode fracture mechanics. Dari hasil analisis diperoleh umur kelelahan platform sebesar 0,51 tahun menggunakan metode fracture mechanics, dimana umur kelelahan ini lebih rendah dibandingkan menggunakan metode cumulative damage. Sehingga dapat disimpulkan, dengan adanya retak membuat umur kelelahan struktur berkurang.===============================================
In Indonesia, offshore platforms are dominated by fixed platforms with an average operating period of more than 20 years. Therefore, fatigue life in offshore structures must be known to anticipate one of the main causes of failure of a structure, especially offshore. In this research, the analysis of fatigue life on a fixed platform using a fracture mechanics method will be carried out. The structure used as the object of research is XA-Pro Platform owned by Pertamina EP. The structure will be analyzed locally after fatigue life is known globally by the method of cumulative damage. In the analysis using the fracture mechanics method begins by determining the joint critical in the structure that has the lowest fault fatigue life due to environmental loads with the help of software. Then the crack propagation analysis at the joint critical was carried out with the Paris Law equation modified by Barsom (1999) on the Variable Amplitude Load condition, so that the fatigue life of the structure was obtained using the fracture mechanics method. From the analysis results obtained by platform fatigue life of 0.51 years using the fracture mechanics method, where the fatigue life is lower than using the cumulative damage method. So that it can be concluded, in the presence of cracks the structure's fatigue life is reduced.
| Item Type: | Thesis (Other) |
|---|---|
| Uncontrolled Keywords: | cumulative damage, fracture mechanics, variable amplitude load, umur kelelahan |
| Subjects: | T Technology > TC Hydraulic engineering. Ocean engineering > TC1665 Offshore structures--Materials. T Technology > TC Hydraulic engineering. Ocean engineering > TC1680 Offshore structures T Technology > TN Mining engineering. Metallurgy > TN871.3 Offshore well drilling |
| Divisions: | Faculty of Marine Technology (MARTECH) > Ocean Engineering > 38201-(S1) Undergraduate Thesis |
| Depositing User: | Anggara Kristoforus Satya |
| Date Deposited: | 24 Jun 2024 06:25 |
| Last Modified: | 24 Jun 2024 06:25 |
| URI: | http://repository.its.ac.id/id/eprint/68634 |
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