Development of high explosive resistant safes.

New safe walls were developed to withstand attacks using mechanical tools and/or explosives. Model experiments with concrete slabs were carried out to obtain an insight into the influence of armor elements on the resistance capability of reinforced concrete walls. For both the damage criteria spalling and perforation, the critical charge masses were determined. The results of the slab tests were transferred to 1 m thick prototype safe walls. These were loaded with an in-wall 5 kg charge. Various parameters were tested and the protection reserved demonstrated by detonating a second 5 kg charge after the first loading. The results on the prototype experiments led to a new standard construction for safe walls of the highest safety category.