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RISK ANALYSIS OF INTERNAL COMBUSTION ENGINE 33
VALVE PRODUCTION USING FMEA METHOD

RISK ANALYSIS OF INTERNAL COMBUSTION ENGINE
VALVE PRODUCTION USING FMEA METHOD

Orçun ASLAN
ITU Material Science & Engineering Department

ABSTRACT

In this article, FMEA method usage for the production of the poppet valves is considered. The definition
of valves, ICE, and FMEA method for risk analysis is going to be remembered to the reader. When we
produce poppet valves, there may be numerous kinds of problems that we meet. These problems should
be handled with care and while doing this we need an approach with FMEA method. To avoid these
problems’ recurrence, FMEA method seems the best for us. In this article, we will focus on the summary
of our work and FMEA usage. The details of production steps, FMEA steps will be introduced in another
article.

Keywords: ICE, Poppet, Valve, P-FMEA, Production.

1. Introduction

An internal combustion engine (ICE) is a heat engine where the combustion of a fuel occurs
with an oxidizer (usually air) in a combustion chamber that is an integral part of the working
fluid flow circuit. In an internal combustion engine the expansion of the high-temperature and
high-pressure gases produced by combustion apply direct force to some component of the
engine. The force is applied typically to pistons, turbine blades, or a nozzle. This force moves
the component over a distance, transforming chemical energy into useful mechanical energy.
The first commercially successful internal combustion engine was created by Étienne Lenoir
around 1859 and the first modern internal combustion engine was created in 1864 by Siegfried
Marcus.

Failure mode and effects analysis (FMEA) was one of the first systematic techniques for failure
analysis. It was developed by reliability engineers in the late 1950s to study problems that might
arise from malfunctions of military systems. A FMEA is often the first step of a system
reliability study. It involves reviewing as many components, assemblies, and subsystems as
possible to identify failure modes, and their causes and effects. For each component, the failure
modes and their resulting effects on the rest of the system are recorded in a specific FMEA
worksheet.

2. Internal Combustion Engine

The term internal combustion engine usually refers to an engine in which combustion is
intermittent, such as the more familiar four-stroke and two-stroke piston engines, along with
variants, such as the six-stroke piston engine and the Wankel rotary engine. A second class of
internal combustion engines use continuous combustion: gas turbines, jet engines and most

Sayı 5, 2016 GiDB|DERGi