I'm looking at the requirements/design for some impact protection guards (I know, tough ask ) for off road bikes. Weight is of high importance, but I may use aluminium for some items and composites for others. I'm still doing the modeling of the actual bike (busy sorting out 3d scanning kit at present) and reading as much as possible. I've done plenty of stress analysis of isotropic materials but need to learn more about composites and brush up on my theory to try come up with a laminate spec. My gut feel is to just go rough estimate of stiffness, toughness and strength and then build and test and improve from there. As I said I'm doing a bunch of reading (white papers, online, a few books, and websites ) which is what led me here but there's a lot to go through. I'll post a thread later once I've done some work, but perhaps someone has an example here of an impact application with a final built and tested part to tickle my creative juices?