PHYSICAL REALITY IN FE HEAD MODELS: ROTATION AND STRAIN

This paper highlights the potential limitations of numerical procedures and the need to capture the relevant physics in the finite element analysis (FEA) models for head impact studies. This is accomplished through a discussion on stress update objectivity, which assumes particular importance because it affects the accuracy of stress and strain calculations when large displacements associated with rotations, as commonly seen in head impacts, are involved. Inaccurate stress and strain results will also result due to material rotation if the objectivity is not maintained.

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