Behnam - Contact stabilization introduces viscous damping to oppose incremental relative motion between surfaces. This can help with initial contact like when one is using stick contact. Essentially using this trades accuracy for convergence. The key is to use only enough to address the convergence issue and if possible phase out the effect once it is not needed. Checkout Manual section 5.2.3 Viscous damping description and the keywords reference guide for the definition options.

I don't know what exactly is causing problems in your simulation, but I find the Analysis user guide is very helpful for diagnosing contact problems. There can be many problem specific variables that effect convergence. I suggest defining what the contact issue is and reading the Analysis users guide Section 39 "Common difficulties associated with contact modeling" to understand what options Abaqus has available.

thank you Daniel.i am modeling  a friction bolted lap joint. because of unconvergence problem i forced to define contact control,i dont know why time increment and initial time increment and tabular load effect on the contact control and the result while the analysis is static general.

when i increase the time period and reduce the max time increment the results are reasonable .(in my model there are some contact and i define contact control because of unconvergence problem) why in general static time period is important while actually its shouldn't effect on static problem?

Dear Behnam,

Did you figure out how to work with Contact Controls?

If so, I'd appreciate it if you could share your knowledge and let me know how to define Stabilizing Coefficient, or Factor. How much it should be?