Studi Parametrik Stress Intensity Factor (SIF) Pada Multiplanar Tubular Joint Berbasis Fracture Mechanics

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. ====================================================================================================== 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 > Ocean Engineering > (S1) Undergraduate Theses
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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