Fast Running Methods for Penetration Processes in Masonry Materials

Current military operations often comprise urban scenarios. Thus, masonry objects offer protection and shielding against weapon effects. To effectively engage enemy forces and targets the munitions applied must be capable of perforating masonry materials and of delivering lethal force behind structures. Building structures may consist of soft materials like clay or adobe as well as of hard materials like brick or (reinforced) concrete. They might be set up of double or triple layers in combination with mortar opposing a very inhomogeneous target compared to classic armored vehicles. The penetration of these structures by small and medium caliber projectiles results in projectile deflection and tumbling. Also large shot to shot scatter of residual velocities is associated with these nonlinear trajectories, as has been observed in penetration testing and high-fidelity numerical simulations (such as FEM). The prediction of weapon effects with standard accredited vulnerability tools, like UniVeMo (Universelles Verwundbarkeitsmodell) in Germany, has to consider the observed effects but also has to provide results in acceptable time frames. Therefore fast-running methods have to be developed. This presentation will demonstrate the IABG approach deriving regression functions and/or look-up tables for small and mid-caliber penetration processes in masonry materials. Based on numerous simulation and experimental results the phenomena observed will be described, the way to fast running modules including the application of analytical tools will be explained, and final results and samples will be demonstrated.