The Material failure can be classified into several types failure
including fatigue which is also classified into plain fatigue and
fretting fatigue. Many studies were carried out to understand the
behavior of the material under the condition of one those two types
only. None of the previous studies considered testing the material under
a combination between plain and fretting fatigue where most of the
components in engineering and industrial application subjected to. This
study is directed to that end. Five tests were conducted with different
ratio between the plain and fretting fatigue. When half of the whole
fretting fatigue life was applied initially and then followed by the
plain fatigue cycles until a failure, the plain fatigue was found to
have no impact on the material life comparing to fretting fatigue. This
shows that most of the fretting fatigue life is expended in the crack
initiation. The ratio between the plain fatigue and the fretting fatigue
has significant effect on fatigue life. If this ratio decreases the
effect of the fretting fatigue increases that results in reduction of
the fatigue life. This study was done under constant contact load, so it
is recommended to investigate the material under combination between
plain and fretting fatigue with variable contact load