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All Journal JURNAL SAINS DAN TEKNOLOGI INDONESIA Majalah Ilmiah Material, Komponen dan Konstruksi Majalah Ilmiah Pengkajian Industri PengabdianMu: Jurnal Ilmiah Pengabdian kepada Masyarakat Jurnal Ners El-Mu'Jam. Jurnal Kajian Al Qur'an dan Al-Hadis
Febriyanti, Eka
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Journal : JURNAL SAINS DAN TEKNOLOGI INDONESIA

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ANALISA KERUSAKAN CONNECTING ROD PADA MESIN DIESEL KENDARAAN BERMOTOR febriyanti, eka
Jurnal Sains dan Teknologi Indonesia Vol. 12 No. 3 (2010)
Publisher : Badan Pengkajian dan Penerapan Teknologi

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (458.156 KB) | DOI: 10.29122/jsti.v12i3.858

Abstract

Connecting rod and crank pin bearing are important components of automotive diesel engine. If these components failed, all of engine system would be shut down. In this research, these components failed during operation. Detail analysis of the failed surface showed that the failure in connecting rod and crank pin bearing was caused by improper lubrication system. Evidence of improper lubrication system was proved by the existence of black scratch and chipping on crank pin bearing which formed by high friction during operation. High friction affects performance of other pistons and therefore bolts of connecting rod experienced dynamic tension load. With repeated load during operation, crack initiated on the bolts and propagated until the bolt could not withstand the load anymore before they are finally broken.
Fenomena Fatik Pada Baut Penyebab Kerusakan Piston Mesin Diesel Suatu Unit Alat Berat Buldozer Febriyanti, Eka
Jurnal Sains dan Teknologi Indonesia Vol. 16 No. 2 (2014)
Publisher : Badan Pengkajian dan Penerapan Teknologi

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (2529.562 KB) | DOI: 10.29122/jsti.v16i2.3410

Abstract

Bolt is important component of diesel engine in bulldozer heavy equipment which has function to tight a piston component, so bolt generally experiences tensile load and torque load in its operation. In this research, showed that the bolt failed during diesel engine operation. Therefore, it is necessary to do a detailed analysis of the main causes bolt failure. Observation and examination include visual observation, fracture surface observation by Scanning Electron Microscope (SEM), metallographic examination, hardness test, tensile testing, and chemical composition analysis by optical emission spectroscopy. Detail analysis of the failed bolt was caused by fatigue failure. The failure of bolt was initiated by plastic deformation such as indentation on the outer bolt surface. Incompatibility of clamping and tightening mechanism is allegedly the caused of the indentation on the bolt. The indentation on outer bolt surface acts as stress riser. With the presence of material defect such as MnS inclusion from metallographic examination, vibration, tensile and torque residual stress during operation, fatigue crack formed and propagated until material is no longer able to withstand load that resulted final fracture.Baut merupakan komponen penting suatu mesin diesel pada sebuah unit alat berat buldozer yang salah satunya berfungsi untuk mengencangkan komponen piston. Oleh karena itu, menyebabkan baut tersebut sering mengalami pembebanan tarik dan torsi dalam pengoperasiannya. Pada penelitian ini menunjukkan bahwa baut rusak selama mesin diesel beroperasi. Untuk mengetahui detail penyebab utama kerusakan yang terjadi pada baut perlu dilakukan analisis yang mendalam. Tahapan yang dilakukan antara lain pemeriksaan visual, pengamatan fraktografi dari permukaan patahan baut dengan menggunakan SEM, pengamatan metalografi, pengujian kekerasan, pengujian tarik, dan analisis komposisi kimia material baut. Dari hasil pengamatan dan pengujian menunjukkan bahwa kerusakan baut disebabkan karena pembebanan fatik dimana kerusakan awal ditandai dengan adanya deformasi plastis berupa indentasi/penjejakan di permukaan luar baut. Oleh karena itu, ketidaksesuaian dalam mekanisme pengencangan dan penjepitan piston menyebabkan terjadinya indentasi/penjejakan. Indentasi/penjejakan di permukaan luar baut berperan sebagai peningkat tegangan. Dengan adanya kehadiran cacat material seperti inklusi MnS seperti yang terlihat dari hasil pengamatan metalografi, ditambah dengan getaran, tegangan tarik, dan torsi selama pengoperasian maka retak fatik terbentuk dari indentasi/penjejakan dan merambat sampai material baut tidak dapat menahan beban dan akhirnya patah.Keywords: bolt, inclusion, indentation, vibration, fatigue
Co-Authors Abdul Gafar, Abdul Amin Suhadi, Amin Annisa Annisa Dedi Supriadi Erwin Erwin Hadipramana, Josef Islamiyah Islamiyah, Islamiyah Jamhari Jamhari Laili Novita Sari Muhammad Fitra Zambak Nurul Huda Ridhowati, Ayu Rizeki Rini Riastuti, Rini Suhadi, M.Eng., Dr. Ir. Amin Suhartono, Hermawan Agus Syaiful Amri Saragih Worferst, Rismadefi