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The principal stresses and the principal directions are calculated from the eigenvalues of the stress tensor. When the solution has not been found, this message is shown to notify the user. You should verify the material properties in your 3D model, making sure their values are correct. Then examine the zoning of your mesh to make sure there is no abrupt increase or decrease of element size and no mesh distortion. Because AUTODYN stopped on the first cycle, it is most likely there is a problem with the initial setup.
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