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All Journal APTEK Jurnal Rekayasa Material, Manufaktur & Energi SAINSTEK
Sepfitrah, Sepfitrah
Jurusan Teknik Mesin Sekolah Tinggi Teknologi Pekanbaru
Aerospace Engineering Civil Engineering, Building, Construction & Architecture Control & Systems Engineering Electrical & Electronics Engineering Energy Engineering Materials Science & Nanotechnology Mechanical Engineering

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ANALISIS PERISTIWA KEGAGALAN PADA ”LEAF SPRING” TRUK COLT DIESEL PENGANGKUT PASIR Sepfitrah -; Yose Rizal
Jurnal APTEK Vol. 5 No. 2 (2013): APLIKASI TEKNOLOGI
Publisher : Universitas Pasir Pengaraian

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (852.863 KB) | DOI: 10.30606/aptk.v5i2.85

Abstract

Vehicle for pengakut goods such as trucks, have tended to point loading up backward toward the center of the body. The back of the truck so the suspension will experience a greater deflection than the suspension on the front. Truck rear suspension system uses leaf springs, which will undergo the toughest conditions in the compressive load over and over again, so the potential for failure due to material fatigue limit passing.In this research investigation into the leaf springs on trucks carrying sand in the form of a broken failure. A broken spring release of a series of truck suspension system to cut the rupture area and certain areas that want to be observed as a test specimen.
ANALISA KEGAGALAN FATIK PADA PLUNGER POMPA TORAK RECIPROCATING 5H3S Yose Rizal; Sepfitrah -
Jurnal APTEK Vol. 6 No. 1 (2014): APLIKASI TEKNOLOGI
Publisher : Universitas Pasir Pengaraian

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1112.604 KB) | DOI: 10.30606/aptk.v6i1.93

Abstract

Pumps supply water used for steam generators in PT. CPI is a reciprocating type IR 5H3S used in the steam generators to be processed in order to supply water to steam. Compression pressure reciprocating pump is very large reaching 89.6 bars, is used to push the volume of liquid to be transferred through the exhaust system. The pressure generated by the movement of the pump plunger working pump suction and presses to compress the fluid. In fact plunger has fail until crack at the operational pressure.This study was conducted with the procedure properly. Through several stages with both the identification and investing the incident, which includes mechanical test hardness test, photo documentation fraktografi (mikrofraktografi and makrofraktografi) the material shaft patah. As approach to the truth has simulation to see the distribution of the forces acting on the piston rod (plunger rod).
Evaluasi Pengujian Kekerasan Material Aisi 4140 Menggunakan Full Factorial Design Of Experiment Weriono Weriono; Rinaldi Rinaldi; Sepfitrah Sepfitrah
Rekayasa Material, Manufaktur dan Energi Vol 3, No 1: Maret 2020
Publisher : Fakultas Teknik UMSU

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (430.159 KB) | DOI: 10.30596/rmme.v3i1.4525

Abstract

Experiment is looking at the influence of dimensions, heat treatment temperature and cooling media effect linearly on hardness, tensile strength steel AISI 4140 so that the level comparison of the hardness of influence on the diameter variation (input effects the response). The Full Factorial Design of Experiment Method is used to assess the results of the hardness test in accordance with the testing hypothesis. Design of Experiment (DOE) has been widely used to determine design factors that significantly influence target responses and build empirical models that represent relationships between significant factors. Reviewing the literature revealed that the majority of researchers explored various DOE. Response Tempering heat treatment with Quenching Oil media, this study used AISI 4140 material with a diameter of 29 mm, 33 mm and 35 mm. Results AISI 4140 of commercial production by partial cutting are then taken for hardness testing. The Full Factorial Design of Experiment Method is used to assess the results of the hardness test in accordance with the hypothesis according to the analysis of variance(Anova). The response of the hardness test data input in the 300 & 900 direction is not influenced by the AISI 4140 material dimensions and the direction of the test surface data retrieval. Fo, 5%, 2.15 = 3.68, then Fo = 50.11> 3.68 in the 300 test direction and Fo, 5%, 2.15 = 3.68, then Fo = 70.79> 3, 68, in the 900 test direction where H0 cannot be accepted while H1 is accepted.
ANALISIS PROXIMATE KUALITAS BATUBARA HASIL TAMBANG DI RIAU Sepfitrah
Sainstek (e-Journal) Vol. 4 No. 1 (2016)
Publisher : Sekolah Tinggi Teknologi Pekanbaru

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Abstract

Kualitas batubara perlu diketahui untuk menentukan apakah batubara tersebut menguntungkan untukditambang.Kualitas batubara disetiap tempat penambangan mempunyai nilai yang berbea-beda.Untuk mengatasi nilaikalor yang rendah, perusahaan melakukan metode blending atau pencampuran dengan batubara kualitastinggi.Komposisi pencampuran haruslah tepat agar didapat kualitas batubara yang paling optimal.Untuk itu perludilakukan penelitian lebih mendalam tentang kualitas batubara di provinsi Riau.Untuk menentukan kualitas batubara digunakan metoe analisis proksimat dan analisis ultimat. Hasil analisis batubara dari tambang yang ada di Riau, yaitu diLogas, berada pada kategori batubara muda dengan nilai kalor 5264 KCal/kg, kurang dari 5700 Kcal/kg. Batu bara daritambang Selensen dan Pangkalan memiliki nilai kalor yang hamper mendekati, masing-masing 6525 KCal/kg dan 6754Kcal/kg, batubara ini masuk dalam kategori Sub bituminous. Batura muda yang ada di Logas cenderung memiliki unsurpencemar udara besar.Untuk mengurangi dampak pencemaran udara dari unsur pengotor tersebut dapat dilakukandengan proses blending dengan batubara yang memiliki kualitas lebih baik, seperti dari Selensen maupun dariPangkalan.
OPTIMASI SISTEM SALURAN TUANG PRODUK COR PULI 12” MENGGUNAKAN SIMULASI ESI PROCAST Sepfitrah
Sainstek (e-Journal) Vol. 3 No. 2 (2015)
Publisher : Sekolah Tinggi Teknologi Pekanbaru

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Abstract

Poroses pengecoran melalui beberapa proses yaitu, peleburan dan pemaduan logam, pembuatancetakan, penuangan logam cair kedalam cetakan, dan proses pengerjaan akhir. Setiap tahapan memilikiparameter yang ditentukan guna mendapatkan hasil pengecoran yang baik dan bebas dari cacat. Sepertipengaturan temperatur peleburan dan penuangan logam cair, sistem rongga saluran tuang, dan jenis cetakanyang digunakan. Pada industri kecil parameter proses pengecoran lebih mengikuti pengalaman, sehinggaparameter tadi tidak terukur. Pada akhirnya, hasil produk coran berkualitas rendah dan banyak terdapat cacat.Pada penelitian ini dicoba untuk mencarikan sebuah solusi dalam pengecoran produk puli pada sebuahindustri kecil. Produk akhir yang didapat masih terdapat cacat shrinkage (penyusutan). Penelitian inimenggunakan metoda kajian teori dan perhitungan mengacu pada literatur serta FEA (Finite ElementAnalisys) sebagai pendekatan terhadapat fenomena hasil pengecoran. FEA berupa simulasi komputerdigunakan untuk menganalisa sistem saluran tuang dan proses pembekuan logam cair dalam cetakan.Berdasarkan hasil penelitian terdapat kesalahan dalam perencanaan saluran tuang yang akhirnyamenyebabkan terjadinya cacat shrinkage, dalam hal ni penempatan posisi raiser dan dimensi raiser itusendiri yang tidak dapat menyuplai logam cair untuk mengatasi efek penyusutan selama proses pembekuanlogam cair.
Co-Authors Rinaldi, Rinaldi Weriono Yose Rizal