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$$p=P/L$$

$$C_E=\cfrac{1-ν_1^2}{E_1}+\cfrac{1-ν_2^2}{E_2}$$

$$K_D=\cfrac{D_1\cdot D_2}{D_1+D_2}$$

$$b=1.60\cdot\sqrt{p\cdot K_D\cdot C_E}$$

$$σ_c=0.798\cdot\sqrt{\cfrac{p}{K_D\cdot C_E}}$$