Shear From Torsion ❲EASY | 2025❳

Materials like cast iron or glass are weaker in tension than in shear. When twisted, they tend to crack at a 45-degree angle. This is because the maximum tensile stress in a twisted shaft occurs at that specific diagonal. Real-World Applications

$$ \tau = \frac{T \cdot r}{J} $$

Stress increases linearly as you move outward. The highest stress always occurs at the outer edge (the "skin") of the object. shear from torsion

As a drill enters a hard surface, the resistance creates massive torsional shear. If the torque exceeds the material's strength, the bit snaps. Materials like cast iron or glass are weaker