Kajian Pengaruh Teknik Pembuatan Lubang terhadap Kekuatan Tarik Komposit Hibrid Serat Gelas dan Serat Karung Plastik

      In panels or components, there are holes for joinning with other part. There are two method for manufacturing a hole, i.e. by boring and molding processes. The objective of this research is to investigate the effect of hole manufacturing method on the tensile properties of hybride composite reinforced chopped strand mat of E-glass fiber and woven roving fiber of plastic bag.       The materials in this research are plastic bag fiber, chopped strand mat of E-glass fiber (300 gr/m2), unsaturated polyester 157 BQTN-EX, and MEKPO hardener. The composite was made using press mold method, prepared with 4 laminates of glass fiber and 3 laminates of plastic bag fiber. The weight fraction fiber (Wf) of the composite was around 38%. The tensile test specimens were produced according to ASTM D 5766. In the middle of each specimen, there is a hole with 4, 6, or 8 mm in diameter. There are two types hole, i.e. holes were manufactured using boring and molding process methods.       The result shows that the highest tensile strength of the composites occurs on the composite with 6 mm in diameter of hole manufactured by boring and molding process. It can be recommended that composite has the higher strength for 6 mm in diameter of hole for joining. The composites with 4 and 6 diameters of holes manufactured by molding process have higher tensile strength compared to that manufactured by boring process. In contrast, the tensile strength of the composite with 8 mm in diameter of hole produced by boring is higher than that of the composite with 8 mm in diameter of hole produced by molding process

Pengaruh Kandungan Dan Ukuran Serbuk Genteng Sokka Terhadap Ketahanan Bakar Komposit Geopolimer

The objective of this research is to investigate the effect of particle content and grain size of Sokka roof tile powder on the burning endurance of the composite of Sokka roof tile powder - ripoxy R-802.The materials used were a Sokka roof tile powder (SGS), ripoxy R-802 resin, MEKPO catalyst and P-EX promotor. The Sokka roof tile powder was generated from the rejected Sokka roof tile which was crushed into powder. The powder was sieved to result in three size variances, which were mesh 80 retained in mesh 100 (177μm-149μm), mesh 150 retained in mesh 200 (99μm-74μm), and breaking away from mesh 200 (≤74μm). Prior to getting mixed with the resin, SGS was heated in an oven for 45 minutes in the temperature of 105oC. Afterwards, the powder was mixed with ripoxy R-802 resin for 3 minutes. The variances of SGS content were determined to be 10%, 20%, 30% and 40% composition. Making composite was conducted by press mould. Fixed composites was given post curing treatment in the temperatures of 80oC for 120 minutes. The burning testing on the composite was conducted on the basis of the standard of ASTM D-635. The indicator of burning endurance was determined by the data of time of burning (TOB) and rate of burning (ROB). The TOB resulted from the time of ignition and the ROB resulted from the time of fire propagation time in the composite. The results of this research are as follows: (1) the addition of SGS can improve the burning endurance of the composite of SGS-ripoxy R-802 as indicated by the increase in the TOB but the decrease of ROB due to the addition of the content of SGS; (2) the small size of the particle of SGS can increase the burning endurance of the composite of SGS-ripoxy R-802 as signified by the increase in the TOB but the decrease in the ROB due to the small size of the particle of SGS which breaks away from mesh 200 (≤74μm)

Desain, Pemilihan Material, dan Faktor Keamanan Stasiun Pengisian Gawai Menggunakan Metode Elemen Hingga

Penggunaan gawai di lingkungan kerja saat ini sudah menjadi kebutuhan umum. Gawai menjadi salah satu produk teknologi yang sangat penting dalam menunjang produktifitas kerja dan memudahkan komunikasi antar pegawai. Kondisi ini menyebabkan stasiun pengisian gawai menjadi media yang sangat penting untuk menjaga konektivitas antar pegawai. Penelitian ini bertujuan mendesain stasiun pengisian gawai menggunakan material Polikarbonat dan HDPE. Pemilihan kedua material tersebut didasarkan pertimbangan sifat isolator listrik yang tak dimiliki oleh material logam. Hal ini sangat penting untuk menjaga keamanan dan keselamatan dalam penggunaannya. Analisis elemen hingga dilakukan menggunakan software Autodesk Inventor Professional 2017. Variasi beban yang digunakan adalah 4 kg, 5 kg, dan 6 kg. Hasil simulasi menunjukkan material HDPE dengan variasi beban 4 kg, 5 kg, dan 6 kg memiliki faktor keamanan berturut-turut sebesar 2,65, 2,12, dan 1,77. Faktor keamanan menggunakan material Polikarbonat dengan variasi beban 4 kg, 5 kg, dan 6 kg berturut-turut sebesar 7,77, 6,22, dan 5,18