Sandwich Core Material Development for Ship Deck Structure

Development of sandwich materials for ship structure is aimed mainly to reduce the ship light weight so that the ship payload increases. This paper addresses development of sandwich core material suitable for ship structure. The core materials were composed of synthetic resin and talc; percentages of talc by total weight investigated were 10%, 20%, 30%, and 40%. Laboratory tests stipulated by the Lloyd’s Register (LR) and Det Norske Veritas (DNV) were performed on the core materials. Moreover, sandwich plates consisted of steel faceplates and the core materials were tested using ASTM standards including tension, shear, and flexure tests. The sandwich plates were applied for designing car deck of a ro-ro ship. Analysis of the sandwich deck under design load utilizing finite element approach was carried out to select the best sandwich core materials developed in this study. It was observed that the sandwich panel deck composed of synthetic resin and core material with 40% talc was better than the others

Aplikasi Sandwich Plate System Berbahan Core Limbah Cangkang Kerang pada Geladak Kapal

The development of technology in the field of materials and construction produces many innovations, one of them is sandwich plate system. Sandwich plate system is a material formed by two different materials into one layer. Sandwich plate system consists of face that from plate and core form composite. Clam shells are one of the waste materials that can be used as filler on the core. The composite material that use as a core is a mixture of clam shells powder as filler and resin as a matrix. The combination of clam shells powder and resin, produces strong composite materials. Sandwich plate system using core from clam shelsl powder and resin produce good strength. The material using 20% clam shells powder as filler of the resin weight has maximum stress 53.32 N/mm2 on the deck and 53.20 N/mm2 for 30% of filler by weight of the resin. The maximum stress value is still below the permission stress required by the class rule

PengaruhRPM Terhadap Kualitas Sambungan Dan Metalurgi Las Pada Joint Line Untuk Aluminium Seri 5083 Dengan Proses Friction Stir Welding

Proses penyambungan Aluminium dengan GTAW dan GMAW mempunyai kekurangan yaitu menyebabkan rusaknya lapisan tahan korosi pada permukaan Aluminium, untuk mengatasi kekurangan tersebut dilakukan pengelasan yang suhu pengelasannya berada di bawah titik leleh Aluminium yaitu Friction Stir Welding. Pada penelitian ini dilakukan pengelasan dengan mesin frais tipe PM 1 1/2 HU sebagai pengganti mesin Friction Stir Welding pada aluminium paduan 5083 dengan tebal 4 mm dengan ukuran 20 mm x 10 mm menggunakan empat variasi RPM sebesar (394,536,755,1084) dengantravel speed sebesar 0.33 mm/detik serta sudut inklinasi 30. Kemudian dilakukan analisa terhadap Perubahan metalurgi, defect yang terjadi dan besarnya heat input yang diwakilkan dengan temperatur pada permukaan weld joint. Dari hasil percobaan diketahui bahwa semakin besar RPM maka semakin besar suhu pengelasan menyebakan bentuk butir semakin besar, surface irragularitis semakin pendek, kekerasan material menjadi lebih rendah serta diskontinuitas berupa weld flash semakin besar. Variasi RPM yang paling optimum adalah RPM dengan kecepatan putar 755 karena pada variasi RPM ini tidak terdapat defect pada weld joint serta memiliki panjang surface irragularitis cukup pendek

Study of Core Material Sandwich Panel in Ship Construction

¾Sandwich panel in ship construction necessitates identification for the core material. Non-metal cores of sandwich materials were identifiedin this study for polyurethane foam, polyresin, and synthetic resin. This material identification was conducted through experiments using Det Norske Veritas (DNV) standard tests. The experiments conducted were reactivity test, density test, and tensile test. Results of the investigation show that the core material suitable for the sandwich panel is synthetic resin with composition of 50% resin,50% talc and 0.3% catalyst. The density of the material is 1,728 kg/m3, tensile strength is 24.75 Mpa, modulus of elastisity is 546.95 Mpa, and shear modulus is 273.48 Mpa

Implementation Forms of Integration Strategy for Development of Shipyard Industry in Surabaya and Surrounding

One of the successes of the Philippines and Vietnam in developing the shipbuilding industry is by applying integration strategies within the shipbuilding industry, so that synergy between docks and supporters is optimized and create sustainable competitiveness. Therefore, this research is aimed at developing shipyard industry in Surabaya and its surroundings, through analysis of business competitiveness with the implementation of integration strategies. The form of strategy implementation from several previous studies was continued through questionnaires (based on Likert Scale) to 31 respondents of top management of a number of shipyard and supporting industries, as well as related institutions. The result, then analyzed by using Quantitative Strategic Planning Matrix (QSPM), so that obtained some form of synergy and potential synergy pattern done in shipbuilding industry development

Kajian Penerapan Aturan Klasifikasi pada Laminasi Struktur Konstruksi Lambung Kapal Ikan Fiberglass 3 GT

Material fiberglass masih menjadi alternatif dalam pembuatan kapal di Indonesia, hal ini terlihat dari banyaknya kapal ikan berbahan fiberglass pesanan KKP pada tahun 2016. Penelitian ini bertujuan untuk melakukan tinjaun sejauh mana penerapan aturan klasisfikasi pada proses produksi pembangunan kapal ikan 3 GT dengan melakukan pengujian kuat tarik dan kuat tekuk terhadap spesimen laminasi kapal ikan FRP 3 GT yang diambil dari dua galangan yang sedang membangun kapal ikan pesanan Kementrian Kelautan dan Perikanan (KKP) tahun 2016, dimana proses pembangunannya mengacu pada persyaratan pengujian dalam Biro Klasikasi Indonesia (BKI) tahun 2015, yang memakai International Standard (ISO) 527-4 (1997) untuk uji tarik, dan ISO 14125 (1998) untuk uji bending. Spesimen yang akan di uji masing-masing diambil dari bagian lunas (keel), alas (bottom) dan sisi (side). Secara keseluruhan hasil yang diperoleh dalam penelitian ini adalah mengevaluasi dari laminasi struktur konstruksi yang pada penerapanya tidak memenuhi dari aturan klasifiaksi dan juga memeberikan alterbatif susunan laminasi optimal untuk diterapkan dalam pembangunan kapal ikan 3 GT berbahan fiberglass. Penelitian ini juga nantinya dapat berkonstribusi dalam penyususnan standarisasi untuk kapal-kapal fiber berukuran kecil

Dynamics Finite Element for Ship Damage Collision Analysis

¾ Along with the growing fleet of vessels, ship collision accident cases are becoming more frequent. It is unavoidable that the rapid shipping due to the number of vessels that operate relatively large and the ship is waiting for the loading and unloading at the port. This study will examine the design of the solid bulk cargo ship safe for shipping operations congested areas. The finite element method is used to determine the amount of internal energy in the structure of damaged vessel. The striking ship is assumed a tanker that have a bulbous bow. Bulk carrier is designed with space of double skin 1.8 m and the structure of wing tank is determined previously. The results obtained from this research is the design of the cargo hold of bulk carrier that has a double skin to protect the leaking compartment when the ship was crashed. Penetration in depth 1.8 m will be occurred at ship if ship crashed is with speed 12 knots and weight 1400 tons

Pengembangan Parameter Teknologi Terhadap Prediksi Produktivitas Pembangunan Kapal Dengan Pendekatan Splin Kubik

Development ofTechnology Parameter Towards Shipbuilding Productivity Predictor Using Cubic Spline Approach. Ability of production processes associated with state-of-the-art technology, which allows the shipbuilding,is customized with modern equipment. It will give impact to level of productivity and competitiveness. This study proposes a nonparametric regression cubic spline approach with 1 knot, 2 knots, and 3 knots. The application programs Tibco Spotfire S+ showed that a cubic spline with 2 knots (4.25 and 4.50) gave the best result with the value of GCV = 56.21556, and R2 = 94.03%.Estimation result of cubic spline with 2 knots for the PT. Batamec shipyard = 35.61 MH/CGT, PT. Dok & Perkapalan Surabaya = 27.49 MH/CGT, PT. Karimun Sembawang Shipyard = 27.49 MH/CGT, and PT. PAL Indonesia = 19.89 MH/CGT

Effect of Fibers on Some Engineering Properties of Cement and Lime Stabilized Soils

Recently, many attempts were made to use metal fiber reinforcements to improve some soil properties. In this research, the effects of fibers on the compaction and mechanical properties of cement and lime stabilized soils (silty and clayey soils respectively) were studied. Variables such as stabilizer (cement and lime) content, amount and type of metal fibers were studied. Results indicated that the addition of fibers lead to increase in the maximum dry unit weight. On the other hand, a maximum values of unconfined and tensile strength were obtained with the addition of 0.5 % short fiber (FS) and 1.5 % long fiber (FL) respectively. During the flexural test a brittle manner failure was observed for the unreinforced samples and samples prepared with little amount of fibers 0.5%. Finally, the addition of fibers increases the fracture energy of cement stabilized silty soil and lime stabilized clayey soil