how to find or evaluate the damage and critical damage

Hello Sir, I am doing research on the journal "A continuum damage mechanics model for void growth and micro crack initiation". In that i am modellling the cylinder with preneck. i have applied tensile load and found the induced stress.  Now, I want to find out the damage and i need to plot the damage vs plastic strain graph and I dont know how to do it abaqus or ansys. Can u please guide me or let me know how to find out the damage and plastic strain and also suggest me the weblinks if there are any which tells about the evaluation of the damage?

I have attached a file of my journal, If possible please check the page 926 , 'figure 5' i.e  'damage vs plastic strain graph '. That is the graph which i want to plo. so, please help

For your comveneice iam providing the weblink where you can check the cylinder with preneck and also damage vs plastic strain graphs. i amalso attaching the same file.

http://www.sciencedirect.com/science?_ob=MiamiImageURL&_cid=271088&_use…

Regards,

Anand James