b'Development of ScalableDimensionless scaling parameters predict performance metrics for rapidly deploying Design Optimizationceramic coated bi-component protective systems under extreme loading events.Parameters for Bi-componentB i-component protection systems need to withstand a variety of extreme loading conditions such as high velocity projectile impact. Ceramics are widely Protective Systems used as the frontal material due to their high strength-to-weight ratios. This project identified the scaling laws linking material and geometric scales of ceramic coated bi-component light armor systems to the final impact performance. The impact failure dynamics for different projectile and target density ratios and relative component mass fractions were quantified and optimized for bonded alumina ceramic and titanium alloy systems. The mechanical wave and failure propagation within the target system PROJECT NUMBER:was characterized and quantified via ballistic experiments, and experimental results 21P1056-004 were subsequently used to calibrate numerical simulations in Abaqus/Explicit. Using the respective wave propagation and solid mechanics equations for high velocity projectile TOTAL APPROVED AMOUNT:impact, dimensionless parameters were derived for first-order performance predictions $254,000 over 2 years of armor systems and verified using existing data in literature. Different material classes PRINCIPAL INVESTIGATOR:were shown to have a characteristic strength term capable of collapsing the ballistic Zherui Guoperformance data. For ceramic coated armors, this characteristic term is the Hugoniot Russell L. Heath Distinguished Postdoctoral Fellow elastic limit, an effective yield strength for ceramic materials. The bonding strength between the components also affects the plate flexural stiffness of the overall structure CO-INVESTIGATOR: and the shear stresses at the interface, both of which are major factors in determining Thomas Lillo, INL the failure of the ceramic component. The contributions of inter-component bonding were parametrized based on the effective target stiffness and bending energy obtained from computational simulations. TALENT PIPELINE:Zherui Guo, Russell L. Heath Distinguished Postdoctoral Fellow converted to staffPUBLICATION AND PRESENTATIONS:Guo, Z., Rate-dependent dynamic cylindrical cavity expansion equations for conical- and ogival-nosed projectiles, Journal of Dynamic Behavior of Materials (2022).Guo, Z., Dimensionless parameters to categorize the failure modes of ductile plate perforation. Proceedings of the 32nd International Ballistics Symposium, Reno, Nevada, USA (2022).Guo, Z., On Brittle Fracture Conoid Angles, Bulletin of the International a) Postmortem image of impacted alumina/titanium bi-componentBallistics Society, (Projected publication target; b) computational simulation of ballistic impact; c) optimizationOct. 2022).map of bi-component armor system; and d) collapsed ballistic perforation data using derived dimensionless parameters.88'