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"ABSTRAK

Fatigue Design Analysis pada Struktur Kapal merupakan hal yang cukup baru di dunia Enjiniring Perkapalan. Struktur Kapal yang sangat rumit dan sangat detail membutuhkan ketelitian yang tinggi untuk menghitung kekuatan strukturnya, lebih-lebih menghitung bagian per bagian strukturnya. Dengan menggunakan metode Finite Element penghitungan umur kelelahan kapal dapat dilakukan dengan lebih mudah, cepat dan akurat. Di samping itu, tidak hanya mencari nilai umur kelelahan kapal akan tetapi Finite Element dapat melakukan analisa frekuensi natural dari struktur, respon harmonik dari beban harmonik sinusoidal dan getaran acak dari beban yang acak.

Faktor utama yang mempengaruhi umur kelelahan kapal dibagi menjadi 3 kategori besar, yaitu beban statik, beban dinamik dan tekanan hidrostatik. Beban statik berasal dari muatan kapal, beban dinamik berasal dari gelombang laut, tekanan hidrostatik berasal dari kedalaman laut. Penghitungan beban dinamik dilakukan dengan menggunakan simplifikasi dan distribusi normal. Umur kelelahan kapal didapat sebesar 49 tahun dengan equivalent alternating stress von-misses terbesar terdapat pada Plate 5 mm sebesar 31,23 Mpa. Umur kelelahan kapal didapat dari bagian yang mengalami tegangan terbesar ketiga. Hal ini disebabkan oleh faktor material, bentuk, luas, permukaan dan produksi material. Frekuensi yang harus dihindari kapal ketika beroperasi adalah 50-90 Hz.

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ABSTRACT

Fatigue Design Analysis on ship‟s structure is relatively new in Marine engineering. The ship structures is so complicated and details, that makes analyzing ship structures is so hard and take so much time. Using Finite Element for Fatigue Design Analysis makes the analysis easier, faster and more accurate. Beside that, not only doing the Fatigue Design Analysis but Finite element also can analyze the harmonic response of the structure from sinusoidal load and random vibration from random load.

The main factor affecting the life of a ship divided by three catgeories, Static Load, Dynamic Load and Hidrostatic Pressure. Static load caused by cargo load, dynamic load caused by sea wave and hidrostatic pressure caused by the depth of the sea. Dynamic load calculated using simplification and Gaussian distribution. The final result of the ship‟s life is 49 years with the biggest equivalent alternating stress von-misses in Plate 5 mm and the amount of equivalent alternating stress von-misses is 31,23 Mpa. Frequency that the ships must be avoided when the ship is in operation is 50-90 Hz.

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"Pembangunan Oil Barge modern dengan tinggi sarat air laut kecil seperti Self-propelled oil barge dengan kemampuan struktur yang baik dapat menunjang kemajuan perindustrian maritim Indonesia. Dilain hal Pengklasifikasian Kapal menggunakan ClassNK semakin diminati pihak pemilik bangunan kapal. Dengan mengaplikasikan Fatigue Design Analysis (FDA), kekuatan konstruksi berdasarkan Rules ClassNK dapat diperhitungkan. Simulasi FDA pada konstruksi dengan klasifikasi Self-propelled oil barge menggunakan Rules ClassNK Part Q tentang Steel Barge memperhitungkan faktor beban static, dinamik (dari pengaruh percepatan SPOB) dan tekanan hidrostatik, yang menghasilkan Equivalent Stress terbesar sebesar 91.26 MPa dengan deformasi terbesar sebesar 0.031626 m.

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The construction of modern Oil Barge with short draught of waterline likes Self-propelled oil barge with good capability of strcture is a right tool to developing the Maritime Industry of Indonesia. In the other case, The Classification of Ship building with ClassNK is more and more interesting to the owner of ship building sides. With applicating the Fatigue Design Analysis (FDA) to the Ship Building, structural strength from Rules ClassNK can be Calculated. The FDA Simulation to the construction from classification Self-propelled oil barge using Rules ClassNK Part Q about Steel Barge are calculated factor of Static load, Dynamic Load (from the influence from Speed of SPOB), and Hidrostatic Pressure, which is produced biggest Equivalent stress with 91.26 MPa and the biggest Deformation at Inner Bottom Plate 10mm with deformation number 0.031626 m."

"These proceedings gather a selection of peer-reviewed papers presented at the 7th International Conference on Fracture Fatigue and Wear (FFW 2018), held at Ghent University, Belgium on 9–10 July 2018.The contributions, prepared by international scientists and engineers, cover the latest advances in and innovative applications of fracture mechanics, fatigue of materials, tribology and wear of materials.The book is intended for academics, including graduate students and researchers, as well as industrial practitioners working in the areas of fracture fatigue and wear."

"These proceedings gather a selection of peer-reviewed papers presented at the 7th International Conference on Fracture Fatigue and Wear (FFW 2018), held at Ghent University, Belgium on 9–10 July 2018.The contributions, prepared by international scientists and engineers, cover the latest advances in and innovative applications of fracture mechanics, fatigue of materials, tribology and wear of materials.The book is intended for academics, including graduate students and researchers, as well as industrial practitioners working in the areas of fracture fatigue and wear."