How to determine the shear stress for plastic deformation to

How to determine the shear stress for plastic deformation to happen?

Solution

Metal piece is subjected to a uniaxial force deformation occurs

• When force is removed:

- metal returns to its original dimensions elastic deformation (atoms return to their original position)

- metal deformed to an extent that it cannot fully recover its original dimensions plastic deformation (shape of the material changes, atoms are permanently displaced from their positions).

If the forces are applied along the faces of the material, they are called shear forces.

shear stress = Shear Force/Area