Analisis Umur Lelah Pada Kapal Pusher Barge Akibat Beban Impact

Artha, Jasmine Aulia (2026) Analisis Umur Lelah Pada Kapal Pusher Barge Akibat Beban Impact. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Pusher barge merupakan moda transportasi laut yang digunakan untuk mengangkut muatan dalam jumlah besar, dengan tugboat mendorong barge melalui struktur pusher pad. Kontak berulang antara haluan tugboat dan pusher pad menimbulkan beban impact serta tegangan siklik yang berpotensi menyebabkan kegagalan kelelahan. Penelitian ini bertujuan menentukan umur lelah struktur pusher pad dan menganalisis pengaruh variasi tinggi gelombang 0,5; 1; dan 1,5 meter. Respons akselerasi tugboat diperoleh melalui simulasi hidrodinamika ANSYS AQWA dan digunakan sebagai beban pada simulasi tumbukan ANSYS LS-DYNA untuk memperoleh tegangan global dan lokal. Umur lelah dihitung dengan dua pendekatan, yaitu simplified fatigue life assessment berbasis kurva S-N dan cumulative damage, serta fracture mechanics berbasis Stress Intensity Factor Mode I dan Hukum Paris dengan retak awal 0,5 mm. Hasil simplified fatigue life assessment menghasilkan umur lelah sebesar 2.694,39 tahun, 2.579,53 tahun, dan 2.408,57 tahun untuk tinggi gelombang 0,5; 1; dan 1,5 meter. Pendekatan fracture mechanics menghasilkan umur lelah sebesar 0,443 tahun atau 161,84 hari; 0,425 tahun atau 155,00 hari; dan 0,398 tahun atau 145,32 hari. Dengan demikian, pendekatan simplified menunjukkan umur struktur melampaui umur desain 25 tahun, sedangkan fracture mechanics menunjukkan bahwa keberadaan retak awal menyebabkan umur lelah berada di bawah umur desain. Kondisi paling kritis terjadi pada tinggi gelombang 1,5 meter.
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A pusher barge is a marine transportation configuration in which a tugboat pushes a barge through a pusher pad structure. Repeated contact between the tugboat bow and the pusher pad produces impact loading and cyclic stresses that may cause fatigue failure. This study determines the fatigue life of the pusher pad structure and evaluates the effect of wave heights of 0.5, 1.0, and 1.5 m. The tugboat acceleration response was obtained using ANSYS AQWA hydrodynamic simulations and applied to ANSYS LS-DYNA collision simulations to determine the global and local stresses. Fatigue life was evaluated using two approaches: a simplified fatigue life assessment based on the S-N curve and cumulative damage, and a fracture mechanics approach based on the Mode I Stress Intensity Factor and Paris law with an initial crack size of 0.5 mm. The simplified fatigue life assessment produced fatigue lives of 2,694.39 years, 2,579.53 years, and 2,408.57 years for wave heights of 0.5, 1.0, and 1.5 m, respectively. The fracture mechanics approach produced fatigue lives of 0.443 years or 161.84 days, 0.425 years or 155.00 days, and 0.398 years or 145.32 days. Therefore, the simplified approach indicates a fatigue life exceeding the 25-year design life, whereas the fracture mechanics approach shows that an initial crack reduces the fatigue life below the design requirement. The 1.5 m wave-height condition is the most critical case.

Item Type:	Thesis (Other)
Uncontrolled Keywords:	pusher barge, beban impact, umur lelah, kurva S-N, fracture mechanics, ANSYS AQWA, ANSYS LS-DYNA., pusher barge, impact load, fatigue life, S-N curve, fracture mechanics, ANSYS AQWA, ANSYS LS-DYNA.
Subjects:	V Naval Science > VM Naval architecture. Shipbuilding. Marine engineering > VM156 Naval architecture V Naval Science > VM Naval architecture. Shipbuilding. Marine engineering > VM163 Hulls (Naval architecture)
Divisions:	Faculty of Marine Technology (MARTECH) > Naval Architecture and Shipbuilding Engineering > 36201-(S1) Undergraduate Thesis
Depositing User:	Jasmine Aulia Artha
Date Deposited:	04 Aug 2026 06:51
Last Modified:	04 Aug 2026 06:51
URI:	http://repository.its.ac.id/id/eprint/143416

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