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Abstrak :
Pada penatalaksanaan fraktur maksilofasial secara internal fiksasi diperlukan pemasangan alat miniplate dan screw sampai terjadi penyembuhan tulang, salah satu material yang paling sering digunakan untuk memfabrikasi miniplate dan screw di pasaran adalah Titanium murni dan TI-6Al-4V, secara ekonomis titanium murni memiliki harga yang lebih tinggi dari TI-6Al-4V yang merupakan metal campuran, penilitian ini bermaksud untuk membandingkan properti mekanikal kedua material sebagai miniplate di bagian maksilofasial, serta menyesuaikan dimensi miniplate TI-6Al-4V untuk menyamai properti mekanikal Titanium Murni. ......In the internal fixation management of maxillofacial fractures, the placement of miniplate and screw is necessary until bone repair takes place, materials that most commonly used to fabricate miniplates and screws are Pure Titanium and TI-6Al-4V ,Economically Pure Titanium tend to have higher price than TI-6Al-4V which is an alloy metals, this research is being held to compare the mechanical properties of both material as a miniplate that specifically used on the maxillofacial, this researacg will also adjust the design of TI-6Al-4V miniplate in order to replicate the property of pure titanium miniplate.

Abstrak :
laminating technology is combining two or more of the same material or different mechanical properties and fisis. The method used is laminated horizontally laminated bending test (bending) where the size and shape to follow the rules of press ASTM test specimens (ASTM D 143)....

Abstrak :
Dalam aplikasi di bidang kelautan, bahan komposit sandwich harus mempunyai kulit dan inti yang memiliki ketahanan yang baik terhadap korosi dan kelembaban. Penetitian ini dilakukan untuk mengetahui pengaruh arah serat dan ketebalan inti terhadap kekuatan tekan dan bending pada material komposit sandwich. Bahan kulit untuk komposit sandwich berupa komposit dari fiberglass dengan matriks polyester resin, untuk inti dari styrofoam, sedangkan untuk adhesive menggunakan bahan dasar epoxy. Arah serat kulit dibuat anyam 4 lapis, anyam-acak-anyam-acak, [0/90]s, [0/45/-45/90]. Ketebalan inti yang digunakan adalah 14 mm dan 28 mm. Hasil penelitian menunjukkan bahwa spesimen dengan ketebalan inti 28 mm menghasilkan kekuatan tekan yang lebih tinggi dibanding spesimen dengan ketebalan inti 14 mm. Sedangkan, spesimen dengan ketebalan inti 14 mm menghasilkan kekuatan bending yang lebih tinggi dibanding spesimen dengan ketebalan inti 28 mm. Spesimen dengan arah serat anyam 4 lapis menghasilkan kekuatan tekan dan bending paling tinggi, diikuti anyam-acak-anyam-acak, [0/90]s dan terakhir [0/45/-45/90].

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In marine application, sandwich composites should have high corrosive and moisture resistance. Polyester reinforced composite as sandwich skin's has been widely used in boat construction. Research has been conducted to investigate influence of fiber orientation and core thickness on the compressive and bending strength of foam cored sandwich composite. Glassfiber reinforced polyester composite used as skin for sandwich and styrofoam as core. The skin has lay-up four layers woven, four layers woven-random alternatively, [0/90]s, and [Q/45/-45/9Q]. The thickness of core were 14 mm and 28 mm. The results indicate that the thicker core has higher compressive strength than the thinner one. However for bending strength the thicker core is higher than the thinner. For skin, lay-up that has higher 0 fiber orientation indicates the highest in both of compressive and bending strength.

Abstrak :
Two kinds of stresses in the gear teeth are root bending stress and tooth contact stress. These two stresses results in the failure of gear teeth. The root bending stress results in fatigue failure and contact stress results in pitting failure at the contact surface. The stress analysis used to minimize gear failure in the design of helical gear. It is also optimize the design of helical gear on the transmission system of the truck motor vehicle, where the power transmission is required at heavy loads with smoother and noiseless operation. In this paper bending stress and contact stress estimated using analytical method while modeling of gears used the numerical solution. Method of beam strength based on modified Lewis calculation used to predict the bending strength of helical gears. Contact stress was estimated using related method of AGMA contact stress. Stress modeling of helical gears is done by ANSYS 14.5, which is a finite element analysis package. The results are then compared with both AGMA and ANSYS procedures. The values of bending strength and contact stress determined using AGMA method found to be compatible with ANSYS simulation.

Abstrak :
ABSTRAK
Pada era perkembangan bidang konstruksi saat ini, kebutuhan konstruksi semakin meningkat. Permintaan bahan bangunan yang kuat, ramah lingkungan, dan mudah didapat menjadi sasaran untuk pembangunan saat ini baik dalam skala besar maupun kecil. Penggunaan limbah yang tepat dapat menciptakan pembangunan hunian murah dan layak pakai tentu menjadi solusi untuk membantu mengurangi pengeluaran pemerintah. Pada penelitian ini, limbah yang akan digunakan adalah limbah beton dan limbah kertas. Pada penelitian ini, limbah yang digunakan yaitu beton dengan mutu lebih atau sama dengan K-500 dan limbah kertas di Fakultas Teknik Universitas Indonesia. Limbah beton dihancurkan untuk menggantikan seluruh agregat kasar alami sedangkan kertas dijadikan bubur kertas sebagai pengganti 10 dari volume agregat halus. Komposisi pada penelitian ini ditetapkan dengan perbandingan semen : agregat = 1:3 dengan proporsi agregat halus sebesar 40 , 45 , dan 50 dari total agregat. Hasil penelitian menunjukan bahwa pada kuat tekan dan kuat lentur komposisi 45 agregat halus merupakan komposisi optimum. Kuat tekan yang dihasilkan sebesar 38,11 MPa atau meningkat sebesar 37 dari beton normal pada hari ke 56 sedangkan kuat lentur yang dihasilkan sebesar 3,87 MPa atau meningkat 19 dari beton normal. Pada pengujian modulus elastisitas, komposisi 50 menghasilkan nilai modulus elastisitas terkecil. Untuk pengujian susut, komposisi 50 menghasilkan nilai tertinggi.

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ABSTRAK
In this current era of construction development, the need for constructions are increasing. The demand for a strong, eco friendly, and easy to get building materials has been the target for current development in both large and small scales. the building materials can be more economical if it uses recycled materials. The appropriate use of wastes can be turned into a concrete that is more cheaper and still meet the standards. In this research, the wastes that will be used are concrete waste and paper waste. Based on previous researchs, the weight of mortar in recycled aggregate is 25 35 for size 8 16 mm and 60 for 4 8 mm diameter. Whereas paper has 56.38 of Calcium Oxide CaO , 16.11 of water H2O , 11.26 of Sulphur Trioxide SO3 , and other elements. In this research, the wastes that are used are concrete with high grade are the same as K 500 and paper waste from Engineering Faculty, Universitas Indonesia. Concrete waste is destroyed to replace all of the natural coarse aggregate while paper is pulped to substitute the 10 of the fine aggregate volume. The composition of this research is determined by the ratio of cement aggregate 1 3 with the fine aggregate proportions are 40 , 45 , and 50 from the total of aggregate. The result of this research shows that from the compression strength and bending strength of the fine aggregate composition of 45 is the most optimum composition. The resulting compression strength is 38.11 MPa or increased 37 from a normal concrete on the 56 day whereas the resulting bending strength is 3.87 MPa or increased 19 from a normal concrete. In the modulus of elasticity test, 50 composition yields the smallest modulus of elasticity. For the shrinkage test, 50 composition yield the highest.