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@turnpedal
It's all about metal elasticity, if I remember correctly from Material's Science which I did at college, Young's Modulus and some other testing, shows the point at which a metal yeilds it's elasticity and becomes plastic (meaning it will bend and not return to it's original form).
Yield strength (the point of no return) gives a good idea of how different metals compare.
http://en.wikipedia.org/wiki/Ultimate_tensile_strength
Material - Yield Strength (MPa = N/mm2)
Steel (high strength) 690
Aluminium (2014) 414
Titanium 940
Aramid (Kevlar) 3620