THE DESIGN OF FATIGUE STRENGTH MACHINE BEING ONE OF THE METHODS FOR DETERMINING THE MECHANICAL PROPERTIES OF THE MATERIALS USED IN THE INDUSTRY

Year 2018, Volume: 5 Issue: 2, 79 - 88, 29.06.2018

AYDIN Şık , AHMET Atak CEMİL Yavuz , VEYSEL Özdemir

Abstract

Machine parts fail to perform their tasks due to the
fatigue with the rate of 90%. The fatigue applications have been known since
the early days of the industrial revolution. The field of study on metal
fatigue has started to expand due to the increase in the use of steel
constructions in the systems of railway bridges in particular. It is of
critical importance for all of the engineering fields to produce designs
against the fatigue. Moreover, it is quite difficult to determine the initial
damages of the fatigue by way of observation and the initial damages of the
fatigue cannot be mostly recognized until a structural component becomes unusable.
Therefore, the determination of fatigue life of the structural members during
the stage of design and development results in a considerable decrease in
unexpected damage risk that may occur during the use. Thus, reliable methods
which can accurately predict the fatigue life are required. However, it is very
difficult to find one single method to determine the fatigue life because of
the presence of different loads and different designs. Finding a generally
accepted and unified method which can accommodate to the desired condition
removes difficulties in determining the fatigue life for each of the designs
separately and facilitates the design process against the fatigue. The fatigue
strength is normally found by means of Wöhler method. It is also called as the
method of (S-N) curves. In this method, each of test parts which are completely
same in terms of material, shape and the quality of surface are continually forced
to the stress at different levels and the number of cycles with which the
fracture occurs is determined.

In this study, a bending fatigue strength machine was
designed in accordance with the method of Wöhler curve. A linear motor enabling
a linear movement was used in the bending fatigue testing machine. The designed
bending fatigue machine was different from the existing machines in terms of
not occupying much area, noise being lower, non-requirement of the additional
apparatus (strap, camshaft, etc.) as the movement is linear; determination of
the force applied on the test sample directly in computer software and easiness
of the measurement and obtaining data such as on which life number the test
sample fractured. 

Keywords

Fatigue, Bending Fatigue Strength

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