Dear Y. Chen,
You can read the crack strains from an Abaqus results file by using Abaqus2Matlab (
http://www.abaqus2matlab.com/ http://www.abaqus2matlab.com/ ). If you are a Matlab user, I think this is a good solution to your problem. Let me know if you need anything else.
________________________________________________________
George Papazafeiropoulos
Captain, Infrastructure Engineer, Hellenic Ministry of National Defence
Civil Engineer, M.Sc., Ph.D. candidate, NTUA
Email:
[hidden email]