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If S is the applied stress, c 1s the width of the crack and r the radius of curvature at the tip of the crack, Griffith's crack theory gives the concentrated stress $$S_{c}$$ as
2 S $$(\frac{c}{r})^{\frac{1}{2}}$$
2 S $$(\frac{c}{r})^{\frac{1}{3 }}$$
S $$(\frac{c}{r})^{\frac{1}{2}}$$
2 S $$(2 \frac{c}{r})^{\frac{1}{2}}$$
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