The Orc World campaign has an interesting history. When the current party dropped in, their weapons were all turned into bone. Naturally, I did not tell them that is what happened, rather that their weapons have become brittle.
They have since upgraded to weapons found in the village (more on that later), but they are still fragile weapons.
The general idea is extremely strict weapon control.
I will be using the following weapon breakage rule:
A natural 20, or maximum damage will break a weapon.
I am thinking about extending the rule to armor as well.