An expression for stress intensity factor, load-point compliance and inverse compliance of three-point bending beams with straight through crack are presented here. The stress intensity factor expression was calculated using the well known Srawley expression, and correcting the effect of the concentrated force of the loading point in finite specimens. The compliance formula was obtained by direct integration of this stress intensity factor, using the classic Irwing method. Finally, a method is proposed for calculation of the inverse compliance, of general application for any span-width ratio.
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