Similar conclusions can be drawn for cracks in soldiers and missiles : In soldiers SIF is greater for small cracks and for small notch radii, with them being nearly constant along the crack front for deep corner cracks. In missiles SIF increases with the ratio between the stress concentrator radius and the missile thickness. In shallow cracks, the front region of the crack is influenced by the stress concentration from the notch. While in deep cracks, the front lies further from the notch. So, the SIF increases as the crack length increases.
For trapezoidal notches, some of these conclusions also apply for notches located outside the corners. For other notches, the portion of the crack front that lies outside the notch is influenced by the stresses from the flanking edges. So, there is no clear correlation between the SIF and the notch radius : In soldiers, more crack closing is needed for deeper cracks. In missiles, a higher SIF is needed for semidlitz notches. d2c66b5586