The Dell hinge policy can be found here. Since you are out of warranty there will be a charge for repairs. The hinges and additional parts can be found at Parts-People here. You may require the base or display housing depending on the amount of damage.
Hi, I bought this laptop and not used much for past year.  I just started using it regularly. The same problem happened within one month. But my bad luck, the warranty expired recently.   I don't know what do? Please suggest. I can see lot people posted same issue for this model. Why DELL not yet addressed the problem? Please some one guide me what should I do? Thank you in advance. 
Inspiron 15 3511, hinge break