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Actually, the stress error estimation is based on the principle of the continuity of stress. The resulting stress distribution of a finite element analysis is generally discontinuous. The nodal stresses of each element are averaged to smooth the discontinuity in the element stresses. The stress error in each element is defined as the difference between the element stress and the average of the nodal stresses corrected using the form functions. This error is used to calculate the energy norm error for each element. COSMOS Products allow the user to plot a contour of the percentage of the elemental energy norm error relative to the average elemental energy.
Note that ERR is unitless and represents a percentage.