Are you telling me the Titanic wasn't fiberglass?
Still, a whack anywhere on a long-keeled fiberglass boat with a block of ice would be a rather bad thing, no? And my time on the Arctic coast of Alaska suggests to me that you would have to worry about hitting ice for all but about one or two months out of the year. And wouldn't being frozen in the ice severely damage a boat -ala what Shackleton's boat suffered? How do they do it?
If these questions seem uninformed it's because they are. I'm new to sailing but would eventually like to have a boat that I could safely take into the areas I mentioned.