Result Optistruct explanation

Hi, 

 

please can you tell me how can i explain thoses results in each iteration ? i did't understand why its 0 for the 2 premiers iterations and after the number is changed !

And what does it mean please ' MAXconstrViol(%)' ?

 

Thank you 

 

Ps : I used thoses parameters :

Objective: Min Weight Comp

Cstr : Volfrac30%

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