Replying to WARRANTY

Im not familiar with this, but has anyone ever warrantied a helmet? Ive got an RED trace and today i caught an edge and thought nothin of it. Hit my head but i didnt think it was that hard, just a little dizzy and shit. But on the lift up i realize that ive got a huge ass crack right down the middle back of the helmet, so apparently i smoked my head hard enough. Honestly tho i really do not think the impact was anywhere near hard enough to crack a helmet. I doubt u can warranty things like this but im wondering if anyone has ever been able to