$$\text { A prismatic shaft (diameter } d _ { 0 } = 19 \mathrm {~mm} \text { ) is loaded by torque } T _ { 1 } \text {. A stepped shaft (diameters } d _ { 1 } = 20 \mathrm {~mm}$$ and $d _ { 2 } = 25 \mathrm {~mm}$ with radius of fillets $R = 2 \mathrm {~mm}$ ) is loaded by torque $T _ { 2 }$. The allowable shear stress in the material is $42 \mathrm { MPa }$. The ratio $T _ { 1 } / T _ { 2 }$ of the maximum permissible torques that can be applied to the shafts, considering stress concentration effects in the stepped shaft is:

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The Answer of $$\text { A prismatic shaft (diameter } d _ { 0 } = 19 \mathrm {~mm} \text { ) is loaded by torque } T _ { 1 } \text {. A stepped shaft (diameters } d _ { 1 } = 20 \mathrm {~mm}$$ and $d _ { 2 } = 25 \mathrm {~mm}$ with radius of fillets $R = 2 \mathrm {~mm}$ ) is loaded by torque $T _ { 2 }$. The allowable shear stress in the material is $42 \mathrm { MPa }$. The ratio $T _ { 1 } / T _ { 2 }$ of the maximum permissible torques that can be applied to the shafts, considering stress concentration effects in the stepped shaft is:

And d2=25 mmd _ { 2 } = 25 \mathrm {~mm}d2​=25 mm

And $d _ { 2 } = 25 \mathrm {~mm}$