Analisa Penjalaran Retak Sekat Ruang Muat Kapal Tanker 17500 DWT Akibat Beban Muatan dengan Metode Elemen Hingga - Crack Propagation Analysis Of Cargo Bulkhead Of Tanker 17500 DWT Due To Tank Loads Using Finite Element Method

Zandi, Erlangga Fandra (2018) Analisa Penjalaran Retak Sekat Ruang Muat Kapal Tanker 17500 DWT Akibat Beban Muatan dengan Metode Elemen Hingga - Crack Propagation Analysis Of Cargo Bulkhead Of Tanker 17500 DWT Due To Tank Loads Using Finite Element Method. Undergraduate thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Kapal Tanker memiliki keistimewaan dalam bentuk konstruksi. Pada kapal tersebut dijumpai berbagai jenis struktur berupa sambungan pelat yang rawan terhadap terjadinya retak, salah satunya adalah konstruksi sekat ruang muat. Pada sekat tersebut terjadi pembebanan fluktuatif akibat muatan maupun pergerakan gelombang sehingga dalam periode tertentu dapat menimbulkan fatigue fracture. Oleh karena itu, pada penelitian ini dilaksanakan analisa mengenai penjalaran retak sekat ruang muat Kapal Tanker 17500 DWT dengan menggunakan metode elemen hingga. Melalui metode tersebut, dibuat pemodelan tiga ruang muat kapal untuk menentukan area nodal tegangan normal maksimum. Setelah itu, nilai tegangan tersebut diaplikasikan pada pemodelan retak untuk menentukan nilai faktor intensitas, laju penjalaran retak, jumlah siklus, maupun umur kelelahan struktur. Dengan demikian, maka diperoleh nilai tegangan normal maksimum sebesar 6,85 MPa. Setelah itu, dengan kedalaman awal retak sebesar 0,5 mm, 1,5 mm, dan 2,5 mm, maka menghasilkan nilai laju perambatan retak (da/dN) berturut-turut sebesar 8,14 x 10-9 m / cycle, 4,44 x 10-8 m / cycle, dan 9,68 x 10-8 m/cycle. Sehingga dengan mengkonversi kedalam bentuk siklus, maka didapatkan nilai fatigue pada kedalaman awal retak tersebut sebesar 30,88 tahun, 9,10 tahun, dan 5,11 tahun. ========================================================================================================== Tanker has own features in its constructions. There are found various types of connection plates that are liable to propagate as cracks, one of which is cargo bulkhead construction. This construction occurs some fluctuating loads due to tank and wave loads that can cause failure of the fatigue structure. So, this study is to be carry out a crack propagation analysis of cargo bulkhead of Tanker 17500 DWT using Finite Element Method. Using this method, the longitudinal extent of the midship cargo tank finite element (FE) model is to cover three cargo tank lengths about midships to achieve the required values of maximum normal stress. After that, this stress is to be applied by crack model to determine the stress intensity factor, crack propagation rate, number of cycles, and fatigue life. Therefore, it takes a maximum normal stress value of approximately 6,85 MPa. After that, by using the crack initiations of 0,5 mm, 1,5 mm, and 2,5 mm, the crack propagation rates are to be reached of 8,14 x 10-9 m / cycle, 4,44 x 10-8 m / cycle, and 9,68 x 10-8 m/cycle. So, if they are converted into number of cycles, the fatigue life values are to be determined of approximately 30,88 years, 9,10 years, and 5,11 years.

Item Type: Thesis (Undergraduate)
Additional Information: RSPe 620.112 6 Zan a-1 3100018078343
Uncontrolled Keywords: Tegangan normal maksimum, faktor intensitas tegangan, laju perambatan retak, jumlah siklus, umur kelelahan, Maximum normal stress, stress intensity factor, crack propagation rate, number of cycle, fatigue life
Subjects: T Technology > TA Engineering (General). Civil engineering (General) > TA347 Finite Element Method
Divisions: Faculty of Marine Technology (MARTECH) > Naval Architecture and Shipbuilding Engineering > 36202-(S1) Undergraduate Thesis
Depositing User: Erlangga Fandra Zandi
Date Deposited: 10 Jan 2019 07:22
Last Modified: 08 Feb 2021 07:03
URI: http://repository.its.ac.id/id/eprint/57620

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