Penggunaan Mode Shape Curvature Method Untuk Identifikasi Kerusakan Struktur Sandwich Ramp Door Plate Kapal

Anjasmara, Haikal (2024) Penggunaan Mode Shape Curvature Method Untuk Identifikasi Kerusakan Struktur Sandwich Ramp Door Plate Kapal. Masters thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Struktur kapal membutuhkan bahan yang tidak hanya memiliki kekuatan tinggi, tetapi juga ringan agar dapat mengangkut muatan lebih banyak, yang pada gilirannya akan meningkatkan efisiensi operasional kapal. Secara lebih mendalam, penggunaan pelat sandwich dalam konstruksi kapal dapat mengurangi berat total konstruksi kapal hingga 5-8%. Selain itu, struktur yang ringan juga dapat mengurangi konsumsi bahan bakar kapal. Namun, dengan kelebihan yang dimili sandwich material juga memiliki kekurangan salah satunya yaitu kerusakan debonding. Debonding adalah terlepasnya sambungan antara lapisan kulit dan inti, hal ini dapat menurunkan kekuatan dari struktur sandwich material. Dikarenakan struktur sandwich material yang terdiri atas face-core-face maka diperlukan metode identifikasi kerusakan pada sandwich material. Studi ini menerapkan Mode shape curvature Method (MSCM) sebagai solusi untuk mengidentifikasi dan memetakan kerusakan pada sandwich material, dengan memperhatikan absolute curvature difference atau absolute square curvature difference. Hasilnya menunjukkan bahwa absolute curvature dapat mengidentikasi kerusakan yang terjadi. Variabel kedalaman kerusakan tidak memengaruhi hasil absolute curvature pada MSCM, namun jumlah kerusakan dan rasio kerusakan yang sama dapat mempengaruhi mode shape dan nilai absolute curvature. Pada variasi kedalaman kerusakan 0.25 mm, 0.50 mm dan 0.75 mm damaged index yang dihasilkan masing-masing 1.434, 1.434 dan 1.433. Lokasi kerusakan juga berdampak pada bentuk mode shape, dengan nilai absolute curvature yang semakin terpusat pada daerah kerusakan yang lebih besar. Pada variasi A damaged indexnya 0.851, pada variasi B damaged indexnya 0.480, pada variasi C damaged indexnya 1.705, pada variasi D damaged indexnya 2.506, pada variasi E damaged indexnya 2.223, dan pada variasi F damaged indexnya 3.139.
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The ship's structure requires materials that are not only strong but also lightweight to enable it to carry a greater load, thereby enhancing operational efficiency. Furthermore, a lightweight structure can reduce fuel consumption in ships. In-depth, the incorporation of sandwich panels in ship construction can lead to a 5-8% reduction in the overall weight of the ship's construction. However, despite the advantages of sandwich materials, they come with drawbacks, one of which is debonding damage. Debonding is the separation of the connection between the outer skin and the core, which can compromise the strength of the sandwich material structure. Due to the composition of face-core-face in sandwich material structures, a method for identifying damage in sandwich materials is essential. This study employs the Mode Shape Curvature Method (MSCM) as a solution to identify and map damage in sandwich materials, focusing on absolute curvature difference or absolute square curvature difference. The results indicate that absolute curvature can successfully identify occurring damage. The depth of the damage does not affect the results of absolute curvature in MSCM. However, the quantity and ratio of damage can influence the mode shape and absolute curvature values. In variations of damage depth at 0.25 mm, 0.50 mm, and 0.75 mm, the resulting damaged index values are 1.434, 1.434, and 1.433, respectively. The location of the damage also impacts the shape of the mode, with absolute curvature values concentrating more in larger damaged areas. In variations A, B, C, D, E, and F, the damaged index values are 0.851, 0.480, 1.705, 2.506, 2.223, and 3.139, respectively.

Item Type:	Thesis (Masters)
Uncontrolled Keywords:	Material sandwich, Metode elemen hingga, Mode shape curvature method, indeks kerusakan; sandwich material, finite element analysis, mode shape curvature method, damaged index.
Subjects:	T Technology > TA Engineering (General). Civil engineering (General) > TA347 Finite Element Method T Technology > TA Engineering (General). Civil engineering (General) > TA355 Vibration.
Divisions:	Faculty of Marine Technology (MARTECH) > Naval Architecture and Shipbuilding Engineering > 36101-(S2) Master Thesis
Depositing User:	Haikal Anjasmara
Date Deposited:	16 Feb 2024 02:54
Last Modified:	16 Feb 2024 02:54
URI:	http://repository.its.ac.id/id/eprint/107319

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