Two Strokes Diesel Engine Exhaust Valve Stress Analysis Using Ceramic (SI3N4) Coating

Nugroho, Adi Osis (2017) Two Strokes Diesel Engine Exhaust Valve Stress Analysis Using Ceramic (SI3N4) Coating. Undergraduate thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Katup gas buang merupakan komponen penting pada mesin disel. Katup gas buang berfungsi untuk mengatur aliran gas buang serta menjaga kekedapan pada ruang bakar. Kerusakan pada katup gas buang dapat berakibat fatal pada kinerja mesin disel. Pada penelitian sebelumnya disebutkan ada 4 penyebab terjadinya kerusakan pada katup gas buang yaitu fatigue, temperatur tinggi, erosi-korosi, dan goresan. Pada penelitian tersebut juga ditemukan ada material yang tahan terhadap suhu tinggi (1000C) sampai dengan 10^7 siklus (lebih tinggi dibandingkan material katup gas buang pada umumnya) yaitu keramik (Si3N4). Keramik dapat digunakan sebagai lapisan pada komponen mesin disel. Penggunaan lapisan keramik dapat berdampak pada tegangan yang diterima oleh katup gas buang, sehingga diperlukan pengujian untuk mengetahuinya. Pengujian dilakukan dengan metode Finite Element (FE). Pengujian terbagi menjadi 3 kasus beban (mechanical load, thermal load, dan thermo-mechanical load) serta berdasarkan 4 model yaitu katup gas buang tanpa lapisan dan menggunakan lapisan dengan ketebalan 0.3mm, 0.4mm, dan 0.5mm. Hasil akhir menunjukkan adanya peningkatan tegangan pada beban thermo-mechanical di area seat face (lokasi tegangan terbesar) sebesar 1.1% (3.96 MPa) pada katup gas buang dengan ketebalan lapisan sebesar 0.5mm dibandingkan dengan tanpa lapisan (standar). ================================================================= Exhaust valve is an important part of a diesel engine. Exhaust valve used for control of exhaust gas and seal the combustion chamber. Failure on exhaust valve can affect the performance of the engine. On related journal, present cause of exhaust valve failure namely, fatigue, high temperature, erosion-corrosion, and wear. It found that there is a material able to withstand high temperature (1000C) without failure up to 10^7 cycles (more than others common exhaust valve materials) which is ceramic (Si¬3N4). Ceramic can be applied as coating on diesel engine parts (exhaust valve combustion face). Applying ceramic as coating on exhaust valve influence the stress on exhaust valve during operation, therefore simulation test is required. FEM (Finite Element Method) used as test tool. The simulation is divided into 3 different load cases (mechanical, thermal, and thermo-mechanical) and based on 4 models which are non-coated exhaust valve and coated with thickness variation of 0.3, 0.4, and 0.5 in mm. The result shown that exhaust valve stress increase with thermo-mechanical load at seat face area (the highest stress occur) by 1.1% (3.96 MPa) on exhaust valve with 0.5 mm coating thickness compared to the non-coated exhaust valve.

Item Type: Thesis (Undergraduate)
Uncontrolled Keywords: Diesel Engine, Exhaust Valve, Stress Analysis, Ceramic Coating
Subjects: V Naval Science > VM Naval architecture. Shipbuilding. Marine engineering > VM731 Marine Engines
Divisions: Faculty of Marine Technology > Marine Engineering > (S1) Undergraduate Theses
Depositing User: Adi Osis Nugroho
Date Deposited: 10 Oct 2017 01:10
Last Modified: 06 Mar 2019 07:49
URI: http://repository.its.ac.id/id/eprint/45365

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