Syed,
For a detailed explanation about averaging you can go through - 20.4 Stress Calculation And Output In Optistruct in the HyperWorks Student guide (page 419).
Read - HyperWorks Desktop Applications > HyperView > Results > Nodal Averaging of Elemental Results in HyperWorks Help.
Also go through the tutorial - HyperWorks Desktop Applications > HyperView > HyperView Tutorials > Result Data Analysis > HV-3060: Transforming and Averaging Stresses
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