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asymmetry coefficient and other factors. It is determined
experimentally, often in terms of a symmetric cycle. Apparatus
for determining the boundary of endurance under conditions of
bending is shown in fig. 6.3.
In trials using the same batch of samples. The first sample load
is quite high stress   0,5...0,7  , where  - the boundary of
I м м
the material sample. In this case, the sample dissolved in a
relatively small number of revolutions (cycles) N .
I

Figure 6.3– Scheme of installation for determining  :
 1
1 – sample; 2 - clamp shell;
3 – bearing.

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