Any ideas how to construct an extremely durable plate (19,5 x 30 cm)? I have made few tests with different methods and the results have very promising but not good enough. The plate has to be so strong that it won´t break under a direct hit of an 170 g object hitting it in a speed of 180 km/h, impact energy will approx. 200 J. So far i have done plates from carbon and kevlar, few layers of carbon to give rigidity and to keep the plate in shape, in top few layers of kevlar to add strength. The question is should i put the kevlar only in top or also between carbon layers? Is 200 g carbon and kevlar strong enough? Should i put layers kevlar/carbon/kevlar/carbon/kevlar or kevlar/kevlar/carbon/carbon/kevlar on some other way? Plate will take hits only on the other side, so maybe more kevlar on that side? What about if i use some glass fibre instead of carbon fibre, Kevlar/kevlar/glass/carbon/glass?