Puspaningtyas, Arvina (2016) Studi Parametrik Stress Intensity Factor (SIF) Pada Multiplanar Tubular Joint Berbasis Fracture Mechanics. Undergraduate thesis, Institut Teknologi Sepuluh Nopember.
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Abstract
Struktur jacket platform sebagai salah satu contoh fixed platform yang paling banyak
digunakan untuk eksplorasi minyak dan gas bumi di perairan dangkal merupakan
suatu sistem yang terdiri dari banyak elemen chord dan brace berupa silinder yang
membentuk tubular joint. Pada fase operasional, struktur lepas pantai memiliki
resiko kegagalan yang salah satunya diakibatkan oleh kelelahan (fatigue). Fatigue
umumnya terjadi pada sambungan las sebagai daerah diskontinuitas yang rentan
terhadap cacat dan keretakan akibat adanya konsentrasi tegangan. Pendekatan
fracture mechanics dapat digunakan untuk menganalisa perilaku retak (crack) yang
terjadi di daerah perpotongan antara chord dan brace pada tubular joint (Murthy et
al, 1993). Stress intensity factor (SIF) merupakan parameter desain untuk
menentukan sifat dan proses kepecahan yang dapat digunakan untuk menentukan
umur sisa dari struktur. Studi ini dilakukan dengan membandingkan nilai SIF dari
beberapa model yang telah divariasikan pembebanan dan geometri crack-nya. Pada
suatu geometri struktur tubular joint yang sama, faktor pembebanan dan geometri
crack sangat mempengaruhi nilai SIF. Semakin besar pembebanan dan semakin
besar ukuran crack, maka SIF yang terbentuk semakin besar.
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Jacket platform structure as one of fixed platform most commonly used for oil and
natural gas exploration in shallow waters is a system that consist of many elements
of chord and brace cylinder forming tubular joint. In the operational phase, offshore
structure have the risk of failure which caused by fatigue. Fatigue commonly occurs
in welded joints as a discontinuity areas that are prone to defects and cracks due to
stress concentration. Fracture mechanics approach can be used to analyze the
behavior of crack that occurred in the area of intersection between the chord and
brace on tubular joint (Murthy et al, 1993). Stress intensity factor (SIF) is a design
parameter for determining the character and process of breakage that can be used to
determine the remaining life of the structure. This study was conducted by
comparing the value of SIF of several models that have varied the loading and crack
geometry. On a tubular joint structure geometry, loading factors and crack geometry
greatly affect the value of the SIF. The larger the load and the larger the size of the
crack, then SIF which formed greater.
| Item Type: | Thesis (Undergraduate) |
|---|---|
| Additional Information: | RSKe 620.112 6 Pus s |
| Uncontrolled Keywords: | crack, fracture mechanics, metode elemen hingga, multiplanar tubular joint, 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: | 21 Feb 2018 03:03 |
| Last Modified: | 27 Dec 2018 04:22 |
| URI: | http://repository.its.ac.id/id/eprint/51309 |
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