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CoGripedia your encyclopedia of terms used in the industrial flooring industry.

Engineering Stress


When a material has a force applied to it, it produces a stress. This stress deforms the material. Engineering stress is a slightly simplified version of true stress, used by engineers in their calculations.

Technical Information

The principal difference between engineering and true stress is:
  • 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 pressure.

Engineering stress is defined as:

  • σ=F/A0   Where:
  • σ=Stress
  • F=Applied force
  • A0=Original area of the plane on which the stress is acting.

The deformation of a material caused by stress is known as strain.

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