The principal difference between engineering and true
- True stress considers the change in
cross-section of the deformed body throughout loading, which in turn gives a
more accurate result.
- Engineering stress assumes a constant
cross-section, giving slightly inaccurate results but still acceptable for most
general engineering applications.
Stress is measured in N/mm2, the same as
Engineering stress is defined as:
- σ=F/A0 Where:
- A0=Original area of the plane on which the stress is acting.
The deformation of a
material caused by stress is known as strain.