Residual stress is the internal stress distribution locked inside an object after all external loading forces have been removed. These stresses are the result of the material obtaining equilibrium after it has undergone plastic deformation.
Common units: Megapascals (MPa) or thousands of pounds per square inch (ksi)
1 ksi = 6.895 MPa
When the force is acting on an angle, it can be split into two directions: normal and tangential (also known as shear).
When a normal force cause an object to contract, it creates compressive stress, while a force that causes an object to expand creates tensile stress. Tangential or shear stress causes an object to deform.
