This is something I've been dying to sit down and play with forever. Now that things are far enough along on my other two projects, it's time to crack the last piece of the puzzle for this third project. I've been using Blender for years. It's an amazingly powerful, versatile tool, which apparently ships with an equally powerful and versatile destruction simulation toolset. It's hidden away on the plug-ins menu, and not "On" by default, which just feels plain wrong.
After tinkering with sim settings for a bit, I'm getting some really nice results. More importantly, porting these modified assets straight into Unity is a breeze.