I've been trying to compare popular materials for bicycle frames in terms of their mechanical properties. One thing I noticed is that it's hardly possible to find a data sheet specifying the impact toughness of a material. I've only found it for some carbon-fibre composites and nothing else.
Why is impact toughness not a commonly listed material specification? Is it considered unimportant? Are the measurement and testing standards unclear? Are there any other reasons?
I'm specifically referring for aluminium 6061 and 7005, steel 4140 and 4130, Titanium 3Al-2.5V and some carbon fibre composites. I could find the data for carbon fibre, but none for any of the metal alloys.