I am trying to run a Non-Linear Static FEA on a small stainless steel sheet metal part.  I have succefully run a linear static FEA on the part but I am getting loads above the yield strength.  I am using a 304 Stainless steel and have created a custom material that includes a modified stress strain curve.  I continiously get warnings that the "Incremental logarithmic strain is too large"  I have tried modifying the mesh and reducing the loads with no success.  Any recomendations?