Thanks CoryPad for all the suggestions.
I'm not in the field but... what about the kevlar that has a yield strengh of 3600 MTa compared to the 800 MTa of a medium steel?
I like to play and abuse RC car models like this:
http://rccaraction.com/Media/CorePages/4_0.jpg
However, when making big jumps or high-speed crashes (they can even reach 90mph), even steel parts gets damaged and needs to be substituted. See these damaged/broken parts for example...