Equivalent Strain von Mises VS Logarithmic Strain

Hello, everyone, I am writing my Bachelor thesis. It's about the Simulation using ANSYS Workbench to calculate the Strain of Model.

My question is: I can use ANSYS Workbench to calculate the Equivalent Strain von Mises, but the Thesis requires the "Logarithmic Strain".

So I wonder, is there a connction between these two Strains? Or is thers any convertion bwtween these two Strains.

Thank your for your Help.