3. Conclusion

Dual hardness armor (BDD), which takes advantage of the exceptional properties of ceramics, was introduced in the 1960s, replacing increasingly heavy metal armor. Thanks to the addition of a ductile layer of polymer or metal composite to the rear surface, the major drawback of ceramics, namely its high fragility, was considerably reduced. At the same time, the positioning of the ceramic on the front face makes it possible to oppose the threat with a material capable of eroding it and greatly reducing its penetration capacity. Ceramics play a key role in protection performance, and although there is no direct relationship between mechanical properties and ballistic performance, hardness, tensile strength, Young's modulus and flexural/tensile strength are all known to be influential factors. It should be noted that all these properties are highly dependent on the microstructure, and consequently...