The effect of a tension crack can again be allowed for, and in this case:

The centre of the most critical circle can only be found by trial and error, various slip circles being analysed and the minimum factor of safety eventually obtained.

A suitable procedure is suggested in Fig. 5.10. The centre of each trial circle is plotted and the F value for the circle is written alongside it. After several points have thus been established it is possible to draw 'contours' of F values, which are roughly elliptical so that their centre indicates where the centre of

5.4.3 Location of the most critical circle

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